As filed with the Securities and Exchange Commission on August 20, 2001
                                                           Registration No. 333-

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                            ________________________

                                   FORM S-3
                            REGISTRATION STATEMENT
                                     Under
                          The Securities Act of 1933
                          __________________________

                            CELL THERAPEUTICS, INC.
            (Exact name of Registrant as specified in its charter)
                          __________________________


                                                                                      
       Washington                                          2384                                   91-1533912
(State or other jurisdiction of                  (Primary Standard Industrial                  (I.R.S. Employer
incorporation or organization)                    Classification Code Number)               Identification Number)


                         201 Elliott Avenue West #400
                           Seattle, Washington 98119
                                (206) 282-7100
   (Address, including zip code, and telephone number, including area code,
                 of Registrant's principal executive offices)
                          ___________________________

                             James A. Bianco, M.D.
                            Cell Therapeutics, Inc.
                         201 Elliott Avenue West #400
                           Seattle, Washington 98119
                                (206) 282-7100
(Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                          ___________________________

                                  Copies to:
                           Michael J. Kennedy, Esq.
                            Karen A. Dempsey, Esq.
                  One Market, Spear Street Tower, Suite 3300
                            San Francisco, CA 94105
                                (415) 947-2000
                          ___________________________


  Approximate date of commencement of proposed sale to the public: From time to
time after the effective date of this Registration Statement.

  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [_]

  If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]

  If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, please check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

                             --------------------


                                      CALCULATION OF REGISTRATION FEE


====================================================== ================ ================= ================== =======================
                                                                           Proposed
                  Title of Each Class                                   Maximum Offering
                   of Securities to                    Amount to be          Price        Aggregate Offering Amount of Registration
                     be Registered                      Registered        Per Security           Price                Fee
- ------------------------------------------------------ ---------------- ----------------- ------------------ -----------------------
                                                                                                 
$150,000,000 5.75% Convertible Subordinated Notes due
 June 15, 2008........................................  $150,000,000(1)       100%(2)        $150,000,000            $37,500
- ------------------------------------------------------ ---------------- ----------------- ------------------ -----------------------
Common Stock, no par value (3)........................     4,411,770(4)                                               --(5)
====================================================== ================ ================= ================== =======================


(1)  Represents the aggregate principal amount of the notes issued by the
     registrant.
(2)  Estimated solely for the purpose of calculating the registration fee
     pursuant to Rule 457(c) under the Securities Act of 1933 and exclusive of
     accrued interest and distributions, if any.
(3)  Includes preferred share purchase rights which, prior to the occurrence of
     certain events, will not be exercisable or evidenced separately from the
     Common Stock.
(4)  Represents 4,411,770 shares of common stock issuable upon conversion of the
     notes at the conversion price of $34.00 per share of common stock. Pursuant
     to Rule 416 under the Securities Act, such number of shares of common stock
     registered hereby shall include an indeterminate number of shares of common
     stock that may be issued in connection with a stock split, stock dividend,
     recapitalization or similar event.
(5)  Pursuant to Rule 457(i), no additional filing fee is payable with respect
     to the shares of common stock issuable upon conversion of the notes because
     no additional consideration will be received in connection with the
     exercise of the conversion privilege.
                             ______________________

     The registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.
================================================================================


The information in this prospectus is not complete and may be changed. We may
not sell these securities until the registration statement relating to these
securities that has been filed with the Securities and Exchange Commission is
effective. This prospectus is not an offer to sell these securities and it is
not solicitiing an offer to buy these securities in any state where the offer or
sale is not permitted.

                 Subject to Completion, Dated August 20, 2001

                                  [CTI LOGO]

                                 $150,000,000

            5.75% Convertible Subordinated Notes due June 15, 2008
          and the common stock issuable upon conversion of the notes

     We issued the notes offered by this prospectus in a private placement in
June 2001.  This prospectus will be used by selling securityholders to resell
their notes and the common stock issuable upon conversion of their notes.  We
will not receive any proceeds from this offering.

     You may convert the notes into shares of our common stock at any time
before their maturity unless we have previously redeemed or repurchased them.
The notes will be due on June 15, 2008.  The conversion rate is 29.4118 shares
per each $1,000 principal amount of notes, subject to adjustment in limited
circumstances.  This is equivalent to an initial conversion price of
approximately $34.00 per share.

     We will pay interest on the notes on June 15 and December 15 of each year.
The first payment will be made on December 15, 2001.  The notes are subordinated
in right of payment to all of our existing and future senior debt.

     We may redeem some or all of the notes at any time before June 21, 2004 at
a redemption price of $1,000 per $1,000 principal amount of notes, plus accrued
and unpaid interest, if any, to, but excluding, the redemption date if the
closing price of our common stock has exceeded 150% of the conversion price then
in effect for at least 20 trading days within a period of 30 consecutive trading
days ending on the trading day before the date of mailing of the provisional
redemption notice.  We will make an additional payment in cash with respect to
the notes called for provisional redemption in an amount equal to $172.50 per
$1,000 principal amount of notes, less the amount of any interest actually paid
on the notes before the date of redemption.  On or after June 21, 2004, we have
the option to redeem all or a portion of the notes that have not been previously
converted at the redemption prices set forth in this prospectus.  In the event
of a Change in Control, as described in this prospectus, you may require us to
repurchase any notes held by you.

     The notes are not listed on any securities exchange or included in any
automated quotation system.  The notes are eligible for trading in the PORTAL
Market of the National Association of Securities Dealers, Inc.  Our common stock
is quoted on the Nasdaq National Market under the symbol "CTIC."  On August 17,
2001, the last reported sale price for our common stock on the Nasdaq National
Market was $26.33 per share.

                             --------------------

The securities offered by this prospectus involve a high degree of risk.  See
"Risk Factors" beginning on page 8.

                             --------------------

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete.  Any representation to the contrary is a
criminal offense.

                   This prospectus is dated August __, 2001


     You should rely only on the information incorporated by reference or
provided in this prospectus or a prospectus supplement or amendment.  We have
not authorized anyone else to provide you with different information.  We are
not making an offer of these securities in any state where the offer is not
permitted.  You should not assume the information in this prospectus or a
prospectus supplement or amendment is accurate as of any date other than the
date on the front of the documents.


                               Table of Contents
                                                                       Page
                                                                       ----

Where You Can Find More Information.................................     1

Prospectus Summary..................................................     3

Risk Factors........................................................     8

Ratio of Earnings To Fixed Charges..................................    18

Description of The Notes............................................    19

Description of Capital Stock........................................    36

Certain Federal Income Tax Considerations...........................    39

Selling Securityholders.............................................    45

Plan of Distribution................................................    47

Legal Matters.......................................................    48

Experts.............................................................    48


                      WHERE YOU CAN FIND MORE INFORMATION

     We file reports, proxy statements and other information with the
Commission, in accordance with the Securities Exchange Act of 1934.  You may
read and copy our reports, proxy statements and other information filed by us at
the public reference facilities of the Commission at 450 Fifth Street, Judiciary
Plaza, N.W., Washington, D.C. 20549-1004.  Copies of such materials can be
obtained at prescribed rates from the Public Reference Section of the Commission
at 450 Fifth Street, N.W., Washington, D.C. 20549-1004.  Please call the
Commission at 1-800-SEC-0330 for further information about the public reference
rooms.  Our reports, proxy statements and other information filed with the
Commission are available to the public over the Internet at the Commission's
World Wide Web site at http://www.sec.gov.

     The Commission allows us to "incorporate by reference" into this prospectus
the information we filed with the Commission.  This means that we can disclose
important information by referring you to those documents.  The information
incorporated by reference is considered to be a part of this prospectus.
Information that we file later with the Commission will automatically update and
supersede this information.  We incorporate by reference the documents listed
below and any future filings made by us with the


Commission under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act until
our offering is complete:

     .  Our Annual Report on Form 10-K/A, as amended, for the fiscal year ended
        December 31, 2000;

     .  Our Quarterly Reports on Form 10-Q for the fiscal quarters ended March
        31, 2001 and June 30, 2001; and

     .  Our Current Reports on Form 8-K filed on June 5, 2001 and June 13, 2001.

     You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address:


                           Louis A. Bianco
                           Executive Vice President, Finance and Administration
                           Cell Therapeutics, Inc.
                           201 Elliot Avenue West, Suite #400
                           Seattle, Washington 98119
                           (206) 282-7100

     You should rely only on the information incorporated by reference or
provided in this prospectus or a prospectus supplement or amendment. We have not
authorized anyone else to provide you with different information. We are not
making an offer of these securities in any state where the offer is not
permitted. You should not assume the information in this prospectus or a
prospectus supplement or amendment is accurate as of any date other than the
date on the front of the documents.

                                      -2-


                              PROSPECTUS SUMMARY

     Because this is a summary, it may not contain all information that may be
important to you. You should read the entire prospectus, including the
information incorporated by reference and the financial data and related notes,
before making an investment decision. When used in this prospectus, the terms
"we," "our" and "us" refer to Cell Therapeutics, Inc. and not to the selling
securityholders.

                                 Our Business

     We develop, acquire and market pharmaceuticals for the treatment of cancer.
Our goal is to create a leading, vertically integrated company with a
diversified portfolio of high value, high growth, proprietary oncology drugs.
Our product development and in-licensing activities are concentrated on
identifying novel, less toxic and more effective drugs to treat cancer.

                                  Our Products

TRISENOX

     We recently launched TRISENOX, our first commercial product, following FDA
approval in September 2000. TRISENOX is marketed in the United States through
our 30 person sales force for the treatment of patients with a type of blood
cell cancer called Acute Promyelocytic Leukemia, or APL, who have relapsed from,
or not responded to, chemotherapy. APL is a life-threatening cancer diagnosed in
approximately 1,500 people each year in the United States. We believe that
TRISENOX may be beneficial in treating cancers other than APL and are sponsoring
multiple trials in a variety of cancer types.

     TRISENOX represents a substantial advancement in the treatment of patients
with APL. The FDA approved TRISENOX based upon results from treating patients
with APL who had relapsed from, or not responded to, chemotherapy. Of the 40
patients who received TRISENOX in the pivotal trial, 70% achieved a complete
remission of their leukemia, and 78% achieved a confirmed molecular remission.
Molecular remission is determined by a highly sensitive test for cells that
contain the abnormal gene responsible for APL. At 18 months follow up, 68% of
the patients in the trial were alive following treatment with TRISENOX.

     Based on encouraging anti-tumor activity observed in Phase I clinical
trials, we believe that TRISENOX may be effective in a wide variety of blood
cell cancers and solid tumors. Currently 25 clinical trials are underway to
evaluate the effectiveness of TRISENOX in treating a variety of cancers,
including multiple myeloma, lymphoma, myelodysplasia, chronic myelogenous
leukemia, cervical cancer, prostate cancer, renal cell cancer and bladder
cancer. TRISENOX has received orphan drug designation from the FDA for treatment
of multiple myeloma and myelodysplasia.

     We plan to sell TRISENOX in markets outside the United States and filed for
approval to market TRISENOX in Europe in November 2000. We expect to receive
marketing authorization for TRISENOX in the European Community by the end of
2001, where the European Medicinal Evaluation Agency has designated TRISENOX as
an orphan medicinal product. However, we may not receive such marketing
authorization by the end of 2001, if at all.

                                      -3-


Polyglutamate Drug Delivery Technology

     We are also developing a new way to deliver cancer drugs more selectively
to tumors in an attempt to reduce the toxic side effects and improve the anti-
tumor activity of existing and new cancer drugs. Our technology links, or
conjugates, a biodegradable polymer called polyglutamate to a cancer drug to
create a new, proprietary compound. We believe this polyglutamate technology
allows a greater percentage of the cancer drug to preferentially accumulate in
tumor tissue. Furthermore, the toxicity of the chemotherapy drug may be reduced
because the drug is inactive while it is bound to the polymer. Once the polymer-
linked cancer drug enters a cancer cell, the polymer is broken down, freeing the
drug directly within the cancer cell. We believe our polyglutamate technology
may allow:

     .  More drug to accumulate in tumor tissue, thereby increasing the
        effectiveness of the chemotherapy agent

     .  Less toxicity at equivalent or even higher doses than that of the free
        chemotherapy agent

     .  The potential to overcome chemotherapy resistance, thereby expanding use
        to a wider variety of cancers

     PG-TXL, or polyglutamate paclitaxel, which is in Phase II clinical trials,
is our most advanced product candidate using this technology. PG-TXL links
paclitaxel, the active ingredient in the world's best-selling cancer drug Taxol,
to our proprietary polyglutamate polymer. Because Taxol is not water soluble, it
must be delivered in an ethanol and castor oil solution, which is often
associated with severe allergic reactions. As a result, Taxol must be given as a
3 hour intravenous infusion, in addition to steroid premedication to reduce the
incidence of severe allergic reactions. In contrast, PG-TXL is water soluble,
allowing it to be administered as a 10 minute infusion without premedication.

     Based on preliminary data from our preclinical and ongoing clinical trials,
we believe that PG-TXL may have less severe side effects and broader anti-tumor
activity than paclitaxel. Currently we are conducting three Phase I clinical
trials and six Phase II clinical trials to evaluate PG-TXL in a variety of
cancers. Our Phase II trials will evaluate PG-TXL as front line treatment of
non-small cell lung cancer, either as a single agent treatment in high risk
patients or in combination with carboplatin for standard risk patients. We are
also studying PG-TXL in combination with carboplatin as front line treatment for
ovarian cancer and as salvage treatment for ovarian cancer and other cancers
when used as a single agent or in combination with cisplatin.

     We plan to expand the investigation of our polyglutamate technology to
other classes of cancer drugs. We plan to file a U.S. Investigational New Drug
application for a novel PG-camptothecin by the end of 2001, and to commence
clinical development shortly thereafter.

                               Other Information

     We were incorporated in Washington in 1991. "CTI," "TRISENOX" and "PG-TXL"
are our trademarks. All other product names, trademarks and trade names referred
to are the property of their respective owners. Our principal offices are
located at 201 Elliot Avenue West #400, Seattle, Washington 95134. Our telephone
number at this location is (206) 282-7100.

                                      -4-


                                  The Offering


                                    
                                       The following is a brief summary of some of the terms of the notes
                                       offered for resale in this prospectus.  For a more complete
                                       description of the terms of the notes, see the "Description of the
                                       Notes" section in this prospectus.

Securities Offered...................  $150,000,000 aggregate principal amount of 5.75% Convertible
                                       Subordinated Notes due June 15, 2008 and shares of stock issuable
                                       upon conversion of the notes.

Interest.............................  We will pay interest on the notes semi-annually on June 15 and
                                       December 15 of each year, commencing December 15, 2001.

Conversion...........................  You have the option to convert the notes into shares of our common
                                       stock at a conversion rate of 29.4118 shares of common stock per
                                       $1,000 principal amount of notes, which is equivalent to a
                                       conversion price of approximately $34.00 per share.  The conversion
                                       rate is subject to adjustment.

                                       You may convert the notes at any time before the close of business
                                       on the maturity date, unless we have previously redeemed or
                                       repurchased the notes; provided, however, that if a note is called
                                       for redemption or repurchase, you will be entitled to convert the
                                       note at any time before the close of business on the date
                                       immediately preceding the date fixed for redemption or repurchase,
                                       as the case may be.

Subordination........................  The notes are subordinated to our present and future Senior Debt, as
                                       that term is defined in this prospectus.  The notes are also
                                       effectively subordinated in right of payment to all indebtedness and
                                       other liabilities of our subsidiaries.  As of June 30, 2001, we had
                                       $1.90 million of senior debt outstanding.  The indenture under which
                                       the notes have been issued, or the Indenture, does not restrict our
                                       incurrence of indebtedness, including Senior Debt, or our
                                       subsidiaries' incurrence of indebtedness.

Global Note; Book Entry System.......  The notes are issued only in fully registered form without interest
                                       coupons and in minimum denominations of $1,000.  The notes are
                                       evidenced by one or more global notes deposited with the trustee for
                                       the notes, as custodian for The Depository Trust Company (DTC).
                                       Beneficial interests in the global notes are shown on, and transfers
                                       of those beneficial interests can only be made through, records
                                       maintained by DTC and its participants.

Optional Redemption..................  We may redeem the notes, at our option, in whole or in part, on or
                                       after June 21, 2004, at the redemption prices set forth in this
                                       prospectus plus accrued interest to, but excluding, the redemption
                                       date.


                                      -5-



                                    
Provisional Redemption...............  We may redeem the notes, in whole or in part, at any time before
                                       June 21, 2004, at a redemption price equal to $1,000 per $1,000
                                       principal amount of the notes to be redeemed plus accrued and unpaid
                                       interest, if any, to, but excluding, the date of redemption if (a)
                                       the closing price of our common stock has exceeded 150% of the
                                       conversion price then in effect for at least 20 trading days within
                                       a period of 30 consecutive trading days ending on the trading day
                                       before the date of mailing of the provisional redemption notice and
                                       (b) the registration statement of which this prospectus forms a part
                                       is effective and available for use and is expected to remain
                                       effective and available for use for the 30 days following the
                                       provisional redemption date, unless registration is no longer
                                       required.  Upon any provisional redemption, we will make an
                                       additional payment in cash or, at our option, common stock, or in a
                                       combination of cash and common stock, with respect to the notes
                                       called for redemption in an amount equal to $172.50 per $1,000
                                       principal amount of the notes, less the amount of any interest
                                       actually paid on the note before the date of redemption.  Any such
                                       payment in common stock will be made assuming a valuation of common
                                       stock as set forth above.  We are obligated to make this additional
                                       payment on all notes called for provisional redemption, including
                                       any notes converted after the notice date and before the provisional
                                       redemption date.

Repurchase at Option of
Holders Upon a Change
in Control...........................  Upon a Change in Control, as that term is defined in this
                                       prospectus, you will have the right, subject to various conditions
                                       and restrictions, to require us to repurchase your notes, in whole
                                       or in part, at 100% of their principal amount, plus accrued interest
                                       to the repurchase date.  The repurchase price is payable in cash or,
                                       at our option, in shares of common stock.  However, we, or the
                                       successor entity in the Change in Control transaction, may pay the
                                       repurchase price in common stock only if the conditions provided in
                                       the Indenture are satisfied.  If the repurchase price is paid in
                                       common stock, the common stock will be valued at 95% of the average
                                       of the high and low sales prices of the common stock for each of the
                                       five trading days ending with the third trading day prior to the
                                       repurchase date.  A Change in Control could be an event of default
                                       under the Senior Debt.  In those circumstances, the subordination
                                       provisions of the Indenture would likely prevent us from
                                       repurchasing the notes until the Senior Debt is paid in full.

Use of Proceeds......................  We will not receive any proceeds from the sale by any selling
                                       securityholder of the notes or the shares offered by this prospectus.

Events of Default....................  The following are events of default under the Indenture for the
                                       notes:

                                       .  we fail to pay the principal of or any premium on these notes
                                          when due, whether or not the payment is prohibited by the
                                          Indenture's subordination provisions

                                       .  we fail to pay any interest on these notes when due and that


                                      -6-



                                       
                                          default continues for 30 days, whether or not the payment is
                                          prohibited by the Indenture's subordination provisions

                                       .  we fail to give the notice that we are required to give if there
                                           is a Change in Control, whether or not the notice is prohibited by
                                           the Indenture's subordination provisions

                                       .  we fail to perform any other covenant in the Indenture and that
                                           failure continues for 60 days after written notice to us by the
                                           trustee or the holders of at least 25% in aggregate principal amount
                                           of outstanding notes

                                       .  we fail to pay when due the principal of any indebtedness for
                                           money borrowed by us or any of our subsidiaries in excess of $10
                                           million if the indebtedness is not discharged and such failure
                                           continues for 30 days or more, or, if such indebtedness has been
                                           accelerated, such acceleration is not annulled, within 30 days after
                                           written notice to us by the trustee or the holders of at least 25%
                                           in aggregate principal amount of the outstanding notes, and

                                       .  certain events of bankruptcy, insolvency or reorganization with
                                           respect to us and our significant subsidiaries specified in the
                                           Indenture.

Registration Rights..................  If we fall to comply with certain of our obligations under the
                                       Registration Rights Agreement, liquidated damages will be payable on
                                       the notes.

PORTAL Trading of Notes..............  The notes are eligible for trading in The PORTAL Market of the NASD.

Risk Factors.........................  You should read "Risk Factors" beginning on page 8 of this
                                       prospectus, so that you understand the risks associated with an
                                       investment in the notes.


                                      -7-


                                 RISK FACTORS

     You should carefully consider the following factors and other information
in this prospectus before deciding to invest in the notes or the common stock
issuable upon conversion of the notes.

     If any of the following risks actually occurs, it could materially harm our
business, financial condition or operating results. In such case, the trading
price of the notes and our common stock could decline and you may lose part or
all of your investment.

If we continue to incur net losses, we may not achieve or maintain
profitability.

     We were incorporated in 1991 and have incurred a net operating loss every
year. As of June 30, 2001, we had an accumulated deficit of approximately $237.7
million. We only recently began to generate product revenue from initial sales
of TRISENOX in the quarter ended December 31, 2000. We may never become
profitable, even if we are able to commercialize additional products. We will
need to conduct significant research, development, testing and regulatory
compliance activities that, together with projected general and administrative
expenses, we expect will result in substantial increasing operating losses for
at least the next several years. Even if we do achieve profitability, we may not
be able to sustain or increase profitability on a quarterly or annual basis.

If we do not successfully develop additional products, we may be unable to
generate revenue.

     We have only one product, TRISENOX, for relapsed or refractory APL, that
has received marketing approval to date. Our leading drug candidates, TRISENOX
for other indications, PG-TXL and CT-2584, are currently in clinical trials.
These clinical trials of the drug candidates involve the testing of potential
therapeutic agents, or effective treatments, in humans in three phases to
determine the safety and efficacy of the drug candidates necessary for an
approved drug. Many drugs in human clinical trials fail to demonstrate the
desired safety and efficacy characteristics. Even if our drugs progress
successfully through initial human testing, they may fail in later stages of
development. A number of companies in the pharmaceutical industry, including us,
have suffered significant setbacks in advanced clinical trials, even after
reporting promising results in earlier trials. For example, in our first phase
III human trial for lisofylline, completed in March 1998, we failed to meet our
two primary endpoints, or goals, even though we met our endpoints in two earlier
phase II trials for lisofylline. As a result, we are no longer developing
lisofylline as a potential product. In addition, data obtained from clinical
trials are susceptible to varying interpretations. Government regulators and our
collaborators may not agree with our interpretation of our future clinical trial
results. The clinical trials of TRISENOX, PG-TXL and CT-2584 or any of our
future drug candidates may not be successful.

     Many of our drug candidates are still in research and preclinical
development, which means that they have not yet been tested on humans. We will
need to commit significant time and resources to develop these and additional
product candidates. We are dependent on the successful completion of clinical
trials and obtaining regulatory approval in order to generate revenues. The
failure to generate such revenues may preclude us from continuing our research
and development of these and other product candidates.

Even if our drug candidates are successful in clinical trials, we may not be
able to successfully commercialize them.

     Since our inception in 1991, we have dedicated substantially all of our
resources to the research and development of our technologies and related
compounds. With the exception of TRISENOX for relapsed or refractory APL, all of
our compounds currently are in research or development, and none has been
submitted for marketing approval. Our other compounds may not enter human
clinical trials on a timely basis, if at all,

                                      -8-


and we may not develop any product candidates suitable for commercialization.
Prior to commercialization, each product candidate will require significant
additional research, development and preclinical testing and extensive clinical
investigation before submission of any regulatory application for marketing
approval. Potential products that appear to be promising at early stages of
development may not reach the market for a number of reasons. Potential products
may:

 .    be found ineffective or cause harmful side effects during preclinical
     testing or clinical trials

 .    fail to receive necessary regulatory approvals

 .    be difficult to manufacture on a large scale

 .    be uneconomical to produce

 .    fail to achieve market acceptance, or

 .    be precluded from commercialization by proprietary rights of third parties.

     Our product development efforts or our collaborative partners' efforts may
not be successfully completed and we may not obtain required regulatory
approvals. Any products, if introduced, may not be successfully marketed nor
achieve customer acceptance.

Because we based several of our drug candidates on unproven novel technologies,
we may never develop them into commercial products.

     We base many of our product candidates upon novel delivery technologies
which we are using to discover and develop drugs for the treatment of cancer.
This technology has not been proven. Furthermore, preclinical results in animal
studies may not predict outcome in human clinical trials. Our product candidates
may not be proven safe or effective. If this technology does not work, our drug
candidates may not develop into commercial products.

     We may not complete our clinical trials in the time expected, which could
delay or prevent the commercialization of our products. Although for planning
purposes we forecast the commencement and completion of clinical trials, the
actual timing of these events can vary dramatically due to factors such as
delays, scheduling conflicts with participating clinicians and clinical
institutions and the rate of patient accruals. Clinical trials involving our
product candidates may not commence nor be completed as forecasted. We have
limited experience in conducting clinical trials. In certain circumstances we
rely on academic institutions or clinical research organizations to conduct,
supervise or monitor some or all aspects of clinical trials involving our
products. In addition, certain clinical trials for our products will be
conducted by government-sponsored agencies and consequently will be dependent on
governmental participation and funding. We will have less control over the
timing and other aspects of these clinical trials than if we conducted them
entirely on our own. These trials may not commence or be completed as we expect.
They may not be conducted successfully. Failure to commence or complete, or
delays in, any of our planned clinical trials could delay or prevent the
commercialization of our products and harm our business.

If we fail to adequately protect our intellectual property, our competitive
position could be harmed.

     Development and protection of our intellectual property are critical to our
business. If we do not adequately protect our intellectual property, competitors
may be able to practice our technologies. Our success depends in part on our
ability to:

 .   obtain patent protection for our products or processes both in the United
    States and other countries

                                      -9-


 .    protect trade secrets, and

 .    prevent others from infringing on our proprietary rights.

     In particular we believe that linking our polymers to existing drugs may
yield patentable subject matter. We do not believe that our polymer-drug
conjugates will infringe any third-party patents covering the underlying drug.
However, we may not receive a patent for our polymer conjugates and we may be
challenged by the holder of a patent covering the underlying drug.

     The patent position of biopharmaceutical firms generally is highly
uncertain and involves complex legal and factual questions. The U.S. Patent and
Trademark Office has not established a consistent policy regarding the breadth
of claims that it will allow in biotech patents. If it allows broad claims, the
number and cost of patent interference proceedings in the U.S. and the risk of
infringement litigation may increase. If it allows narrow claims, the risk of
infringement may decrease, but the value of our rights under our patents,
licenses and patent applications may also decrease.

     Patent applications in which we have rights may never issue as patents and
the claims of any issued patents may not afford meaningful protection for our
technologies or products. In addition, patents issued to us or our licensors may
be challenged and subsequently narrowed, invalidated or circumvented.
Litigation, interference proceedings or other governmental proceedings that we
may become involved in with respect to our proprietary technologies or the
proprietary technology of others could result in substantial cost to us. Patent
litigation is widespread in the biotechnology industry, and any patent
litigation could harm our business. Costly litigation might be necessary to
protect our orphan drug designations or patent position or to determine the
scope and validity of third party proprietary rights, and we may not have the
required resources to pursue such litigation or to protect our patent rights. An
adverse outcome in litigation with respect to the validity of any of our patents
could subject us to significant liabilities to third parties, require disputed
rights to be licensed from third parties or require us to cease using a product
or technology.

     We also rely upon trade secrets, proprietary know-how and continuing
technological innovation to remain competitive. Third parties may independently
develop such know-how or otherwise obtain access to our technology. While we
require our employees, consultants and corporate partners with access to
proprietary information to enter into confidentiality agreements, these
agreements may not be honored.

If any of our license agreements for intellectual property underlying TRISENOX,
PG-TXL or any other product are terminated, we may lose our rights to develop or
market that product.

     Patents issued to third parties may cover our products as ultimately
developed. We may need to acquire licenses to these patents or challenge the
validity of these patents. We may not be able to license any patent rights on
acceptable terms or successfully challenge such patents. The need to do so will
depend on the scope and validity of these patents and ultimately on the final
design or formulation of the products and services that we develop.

     We have licensed intellectual property, including patent applications from
Memorial Sloan Kettering Cancer Institute, Samuel Waxman Cancer Research
Foundation, Beijing Medical University and others, including the intellectual
property underlying TRISENOX. We have also in-licensed the intellectual property
relating to our polymer drug delivery technology, including PG-TXL. Some of our
product development programs depend on our ability to maintain rights under
these licenses. Each licensor has the power to terminate its agreement with us
if we fail to meet our obligations under that license. We may not be able to
meet our obligations under these licenses. If we default under any of these
license agreements, we may lose our right to market and sell any products based
on the licensed technology.

                                     -10-


Our products could infringe on the intellectual property rights of others, which
may cause us to engage in costly litigation and, if we are not successful, could
cause us to pay substantial damages and prohibit us from selling our products.

     Although we attempt to monitor the patent filings of our competitors in an
effort to guide the design and development of our products to avoid
infringement, third parties may challenge the patents that have been issued or
licensed to us. We may have to pay substantial damages, possibly including
treble damages, for past infringement if it is ultimately determined that our
products infringe a third party's patents. Further, we may be prohibited from
selling our products before we obtain a license, which, if available at all, may
require us to pay substantial royalties. Even if infringement claims against us
are without merit, defending a lawsuit takes significant time, may be expensive
and may divert management attention from other business concerns.

Our limited operating experience may cause us difficulty in managing our growth
and could seriously harm our business.

     As a result of FDA approval of TRISENOX for relapsed or refractory APL and
clinical trials currently underway, we will need to expand our operations in
various areas, including our management, regulatory, clinical, financial and
information systems and other elements of our business process infrastructure.
We expect to add additional key personnel in these areas in the near future. In
addition, if rapid growth occurs, it may strain our operational, managerial and
financial resources. We will not be able to increase revenues or control costs
unless we continue to improve our operational, financial, regulatory and
managerial systems and processes, and expand, train and manage our work force.

If we fail to keep pace with rapid technological change in the biotechnology and
pharmaceutical industries, our products could become obsolete.

     Biotechnology and related pharmaceutical technology have undergone and are
subject to rapid and significant change. We expect that the technologies
associated with biotechnology research and development will continue to develop
rapidly. Our future will depend in large part on our ability to maintain a
competitive position with respect to these technologies. Any compounds, products
or processes that we develop may become obsolete before we recover any expenses
incurred in connection with developing these products.

We face direct and intense competition from our rivals in the biotechnology and
pharmaceutical industries and we may not compete successfully against them.

     The biotechnology and pharmaceutical industries are intensely competitive.
We have numerous competitors in the United States and elsewhere. Our competitors
include major, multinational pharmaceutical and chemical companies, specialized
biotechnology firms and universities and other research institutions. Many of
these competitors have greater financial and other resources, larger research
and development staffs and more effective marketing and manufacturing
organizations, than we do. In addition, academic and government institutions
have become increasingly aware of the commercial value of their research
findings. These institutions are now more likely to enter into exclusive
licensing agreements with commercial enterprises, including our competitors, to
market commercial products.

     Our competitors may succeed in developing or licensing technologies and
drugs that are more effective or less costly than any we are developing. Our
competitors may succeed in obtaining FDA or other regulatory approvals for drug
candidates before we do. In particular, we face direct competition from many
companies focusing on delivery technologies. Drugs resulting from our research
and development efforts, if approved for sale, may not compete successfully with
our competitors' existing products or products under development.

                                     -11-


We may need to raise additional funds in the future, and they may not be
available on acceptable terms, or at all.

     We expect that our existing capital resources and the interest earned
thereon will enable us to maintain our current and planned operations until
2005. Beyond that time, if our capital resources are insufficient to meet future
capital requirements, we will have to raise additional funds to continue the
development of our technologies and complete the commercialization of products,
if any, resulting from our technologies. We will require substantial funds to:
(1) continue our research and development programs, (2) in-license or acquire
additional technologies and (3) conduct preclinical studies and clinical trials.
We may need to raise additional capital to fund our operations repeatedly. We
may raise such capital through public or private equity financings,
partnerships, debt financings, bank borrowings, or other sources. Our capital
requirements will depend upon numerous factors, including the following:

 .    the establishment of additional collaborations

 .    the development of competing technologies or products

 .    changing market conditions

 .    the cost of protecting our intellectual property rights

 .    the purchase of capital equipment

 .    the progress of our drug discovery and development programs, the progress
     of our collaborations and receipt of any option/license, milestone and
     royalty payment resulting from those collaborations, and

 .    in-licensing and acquisition opportunities.

     Additional funding may not be available on favorable terms or at all. If
adequate funds are not otherwise available, we may curtail operations
significantly. To obtain additional funding, we may need to enter into
arrangements that require us to relinquish rights to certain technologies, drug
candidates, products and/or potential markets. To the extent that additional
capital is raised through the sale of equity, or securities convertible into
equity, you may experience dilution of your proportionate ownership of the
company .

Our stock price is extremely volatile, which may affect our ability to raise
capital in the future.

     The market price for securities of biopharmaceutical and biotechnology
companies, including that of ours, historically has been highly volatile, and
the market from time to time has experienced significant price and volume
fluctuations that are unrelated to the operating performance of such companies.
For example, during the twelve months ended July 31, 2001, our stock price
ranged from a low of $10.50 to a high of $77.25. Fluctuations in the trading
price or liquidity of our common stock may adversely affect our ability to raise
capital through future equity financings.

     Factors that may have a significant impact on the market price and
marketability of our common stock include:

 .  announcements of technological innovations or new commercial therapeutic
   products by us, our collaborative partners or our present or potential
   competitors

 .  our quarterly operating results

 .  announcements by us or others of results of preclinical testing and clinical
   trials

                                     -12-


 .    developments or disputes concerning patent or other proprietary rights

 .    developments in our relationships with collaborative partners

 .    acquisitions

 .    litigation

 .    adverse legislation, including changes in governmental regulation and the
     status of our regulatory approvals or applications

 .    third-party reimbursement policies

 .    changes in securities analysts' recommendations

 .    changes in health care policies and practices

 .    economic and other external factors, and

 .    general market conditions.

     In the past, following periods of volatility in the market price of a
company's securities, securities class action litigation has often been
instituted.  If a securities class action suit is filed against us, we would
incur substantial legal fees and our management's attention and resources would
be diverted from operating our business in order to respond to the litigation.

There are a substantial number of unregistered shares of our common stock which,
when registered for resale, could result in a decrease in our stock price or
impair our ability to raise funds in future equity offerings.

     The sale, or availability for sale, of substantial amounts of our common
stock in the public market could materially decrease the market price of our
common stock and could impair our ability to raise additional capital.  Any
sales by existing shareholders or holders of options or warrants may have an
adverse effect on our ability to raise capital and may adversely affect the
market price of the common stock.

We may be unable to attain the raw materials necessary to produce our PG-TXL
product candidate in sufficient quantity to meet demand when and if such product
is approved.

     Paclitaxel is derived from certain varieties of yew trees. Supply of yew
trees is tightly controlled by a limited number of companies. We cannot be sure
that we will be able to continue to purchase the materials necessary to produce
PG-TXL in adequate volume and quality.

Our dependence on third party manufacturers means that we may not have
sufficient control over the manufacture of our products.

     We currently do not have internal facilities for the manufacture of any of
our products for clinical or commercial production. In addition, TRISENOX, our
first commercial product, is manufactured by a single source. We will need to
develop additional manufacturing resources, enter into collaborative
arrangements with other parties which have established manufacturing
capabilities or elect to have other third parties manufacture our products on a
contract basis. We are dependent on such collaborators or third parties to
supply us in a timely way with products manufactured in compliance with
standards imposed by the FDA and foreign regulators. The manufacturing
facilities of contract manufacturers may not comply with applicable

                                     -13-


manufacturing regulations of the FDA nor meet our requirements for quality,
quantity or timeliness. Another of our products under development, PG-TXL, is
complex to manufacture, which may prevent us from obtaining a sufficient supply
for the increased clinical trials that are currently planned or underway.

We may face difficulties in achieving acceptance of our products in the market
if we do not continue to expand our sales and marketing infrastructure.

     We currently are marketing TRISENOX with our direct sales force. Because
the oncology market is highly concentrated and many prospective clients are
unfamiliar with TRISENOX, we will need to continue to expand our sales and
marketing infrastructure in order to increase market awareness of this product.
We are in the process of expanding our direct sales force, and currently require
additional qualified sales personnel. Competition for these individuals is
intense, and we may not be able to hire the type and number of sales personnel
we need. In addition, should we have to market and sell directly our products
other than TRISENOX, we would need to further expand our marketing and sales
force with sufficient technical expertise and distribution capacity. If we are
unable to continue to expand our direct sales operations and train new sales
personnel as rapidly as necessary, we may not be able to increase market
awareness and sales of our products, which may prevent us from growing our
revenues and achieving and maintaining profitability.

If we lose our key personnel or are unable to attract and retain additional
personnel, we may be unable to pursue collaborations or develop our own
products.

     We are highly dependent on Dr. James A. Bianco, our Chief Executive
Officer, and Dr. Jack Singer, our Executive Vice President, Research Program
Chairman. The loss of these principal members of our scientific or management
staff, or failure to attract or retain other key scientific personnel employees,
could prevent us from pursuing collaborations or developing our products and
core technologies. Recruiting and retaining qualified scientific personnel to
perform research and development work are critical to our success. There is
intense competition for qualified scientists and managerial personnel from
numerous pharmaceutical and biotechnology companies, as well as from academic
and government organizations, research institutions and other entities. In
addition, we rely on consultants and advisors, including our scientific and
clinical advisors, to assist us in formulating our research and development
strategy. All of our consultants and advisors are employed by other employers or
are self-employed, and have commitments to or consulting or advisory contracts
with other entities that may limit their availability to us.

We are subject to extensive government regulation, including the requirement of
approval before our products may be marketed.

     The FDA has approved only one of our products, TRISENOX, for sale in the
United States, for relapsed or refractory APL. Before we can market TRISENOX for
other indications, we must obtain FDA approval. Our other products are in
development, and will have to be approved by the FDA before they can be marketed
in the United States. If the FDA does not approve our products and any
additional indications for marketed products in a timely fashion, or does not
approve them at all, our business and financial condition may be adversely
affected.

     In addition, we and our products are subject to comprehensive regulation by
the FDA both before and after products are approved for marketing. The FDA
regulates, for example, research and development, including preclinical and
clinical testing, safety, effectiveness, manufacturing, labeling, advertising,
promotion, export, and marketing of our products. Our failure to comply with
regulatory requirements may result in various adverse consequences including FDA
delay in approving or refusal to approve a product, recalls, withdrawal of an
approved product from the market, and/or the imposition of civil or criminal
sanctions.

                                     -14-


Because there is a risk of product liability associated with our products, we
face potential difficulties in obtaining insurance.

     Our business exposes us to potential product liability risks inherent in
the testing, manufacturing and marketing of human pharmaceutical products, and
we may not be able to avoid significant product liability exposure. While we
have insurance covering product use in our clinical trials, and currently have
product liability insurance for TRISENOX, it is possible that we will not be
able to maintain such insurance on acceptable terms or that any insurance
obtained will provide adequate coverage against potential liabilities. Our
inability to obtain sufficient insurance coverage at an acceptable cost or
otherwise to protect against potential product liability claims could prevent or
limit the commercialization of any products we develop. A successful product
liability claim in excess of our insurance coverage could exceed our net worth.

Uncertainty regarding third party reimbursement and health care cost containment
initiatives may limit our returns.

     The ongoing efforts of governmental and third party payors to contain or
reduce the cost of health care will affect our ability to commercialize our
products successfully. Governmental and other third party payors increasingly
are attempting to contain health care costs by:

 .    challenging the prices charged for health care products and services

 .    limiting both coverage and the amount of reimbursement for new therapeutic
     products

 .    denying or limiting coverage for products that are approved by the FDA but
     are considered experimental or investigational by third-party payors, and

 .    refusing in some cases to provide coverage when an approved product is used
     for disease indications in a way that has not received FDA marketing
     approval.

     In addition, the trend toward managed health care in the United States, the
growth of organizations such as health maintenance organizations, and
legislative proposals to reform healthcare and government insurance programs
could significantly influence the purchase of healthcare services and products,
resulting in lower prices and reducing demand for our products.

     Even if we succeed in bringing any of our proposed products to the market,
they may not be considered cost-effective and third party reimbursement might
not be available or sufficient. If adequate third party coverage is not
available, we may not be able to maintain price levels sufficient to realize an
appropriate return on our investment in research and product development. In
addition, legislation and regulations affecting the pricing of pharmaceuticals
may change in ways adverse to us before or after any of our proposed products
are approved for marketing. While we cannot predict whether any such legislative
or regulatory proposals will be adopted, the adoption of such proposals could
make it difficult or impossible to sell our products. TRISENOX has been
reimbursed by third party payors, but there is no guarantee this reimbursement
will continue.

Since we use hazardous materials in our business, we may be subject to claims
relating to improper handling, storage or disposal of these materials.

     Our research and development activities involve the controlled use of
hazardous materials, chemicals and various radioactive compounds.  We are
subject to federal, state and local laws and regulations governing the use,
manufacture, storage, handling and disposal of such materials and certain waste
products.  Although we believe that our safety procedures for handling and
disposing of such materials comply with the standards prescribed by state and
federal regulations, the risk of accidental contamination or injury from these
materials

                                     -15-


cannot be eliminated completely. In the event of such an accident, we could be
held liable for any damages that result and any such liability not covered by
insurance could exceed our resources. Compliance with environmental laws and
regulations may be expensive, and current or future environmental regulations
may impair our research, development or production efforts.

We may not be able to conduct animal testing in the future which could harm our
research and development activities.

     Certain of our research and development activities involve animal testing.
Such activities have been the subject of controversy and adverse publicity.
Animal rights groups and other organizations and individuals have attempted to
stop animal testing activities by pressing for legislation and regulation in
these areas.  To the extent the activities of these groups are successful, our
business could be materially harmed by delaying or interrupting our research and
development activities.

Because our charter documents contain certain anti-takeover provisions and we
have a rights plan, it may be more difficult for a third party to acquire us,
and the rights of some shareholders could be adversely affected.

     Our Restated Articles of Incorporation and Bylaws contain provisions that
may make it more difficult for a third party to acquire or make a bid for us.
These provisions could limit the price that certain investors might be willing
to pay in the future for shares of our common stock. In addition, shares of our
preferred stock may be issued in the future without further shareholder approval
and upon such terms and conditions and having such rights, privileges and
preferences, as the board of directors may determine. The rights of the holders
of common stock will be subject to, and may be adversely affected by, the rights
of any holders of preferred stock that may be issued in the future. The issuance
of preferred stock, while providing desirable flexibility in connection with
possible acquisitions and other corporate purposes, could have the effect of
making it more difficult for a third party to acquire, or of discouraging a
third party from acquiring, a majority of our outstanding voting stock. We have
no present plans to issue any additional shares of preferred stock. In addition,
we have adopted a shareholder rights plan that, along with certain provisions of
our Restated Articles of Incorporation, may have the effect of discouraging
certain transactions involving a change of control of the company.

The notes are subordinated to our other existing and any future senior debt.

     The notes are unsecured and subordinated in right of payment to all of our
existing and future Senior Debt. As a result, in the event of bankruptcy,
liquidation or reorganization or upon acceleration of the notes due to an Event
of Default and in specific other events, our assets will be available to pay
obligations on the notes only after all Senior Debt has been paid in full. There
may not be sufficient assets remaining to pay amounts due on the notes then
outstanding. The notes also will be effectively subordinated to the liabilities,
including trade payables and lease obligations, and preferred stock, of our
subsidiaries. The Indenture governing the notes does not prohibit or limit the
incurrence of Senior Debt or the incurrence of other debt and other liabilities
by us or our subsidiaries. The incurrence of additional Senior Debt and other
liabilities by us or our subsidiaries could impede our ability to pay
obligations on the notes. As of June 30, 2001 we had $1.9 million of Senior
Debt. We anticipate that from time to time we will incur additional debt,
including senior indebtedness. See "Description of the Notes--Subordination."

We may be unable to repurchase the notes.

     At maturity, the entire outstanding principal amount of the notes will
become due and payable. In addition, if a Change in Control occurs, each holder
of the notes may require us to repurchase all or a portion of that holder's
notes. At maturity or if a Change in Control occurs, we may not have sufficient
funds or may be unable to arrange for additional financing to pay the principal
amount or repurchase price due. Under the

                                     -16-


terms of the Indenture for the notes, we may elect, if we meet certain
conditions, to pay the repurchase price with shares of common stock. Our
borrowing arrangements or agreements relating to Senior Debt to which we become
a party may contain restrictions on, or prohibitions against, our repurchases of
the notes. If the maturity date or Change in Control occurs at a time when our
other arrangements prohibit us from repurchasing the notes, we could try to
obtain the consent of the lenders under those arrangements to purchase the
notes, or we could attempt to refinance these borrowings that contain the
restrictions. If we do not obtain the necessary consents or refinance these
borrowings, we will be unable to repurchase the notes. In that case, our failure
to repurchase any tendered notes or notes due upon maturity would constitute an
Event of Default under the Indenture. Any such default, in turn, may cause a
default under the terms of our Senior Debt. As a result, in those circumstances,
the subordination provisions of the Indenture would, absent a waiver, prohibit
any repurchase of the notes until we pay the Senior Debt in full.

We may be unable to generate sufficient cash flow from which to make payments on
the notes.

     We expect to incur substantial net operating losses for the foreseeable
future. We may not become profitable or sustain profitability in the future.
Accordingly, we may not have sufficient funds to make payments on the notes.
Therefore, we may not have sufficient assets remaining to pay amounts due on any
or all of the notes.

Sales of a large number of shares by Cell Therapeutics or by stockholders could
depress our stock price.

     The market price of our common stock could drop as a result of sales or
expected sales of a large number of our shares in the public market after the
offering. In connection with our sale of the notes to the CIBC World Markets
Corp., Banc of America Securities LLC and U.S. Bancorp Piper Jaffray, which we
refer to in this prospectus as the Initial Purchasers, we became subject to a
90-day lockup period following June 13, 2001, the date of such sale. During this
lockup period, we are not allowed to issue additional common stock or securities
convertible into common stock except in certain circumstances or unless the
Initial Purchasers consent to such issuance.

There is no public market for the notes being offered and restrictions on
transfer of the notes and the common stock issuable upon conversion of the notes
may significantly impair the liquidity of the notes.

     While the outstanding notes are eligible for trading in the PORTAL market,
there is no public market for the notes.  Accordingly, we cannot assure you as
to:
          .  the liquidity of any such market that may develop,

          .  your ability to sell the notes, or

          .  the price at which you would be able to sell the notes.

     If such a market were to exist, the notes could trade at prices that may be
higher or lower than the principal amount or purchase price, depending on many
factors, including prevailing interest rates, the market for similar notes, and
our financial performance. The Initial Purchasers have advised us that they
presently are making a market in the notes. The Initial Purchasers are not
obligated, however, to make a market in the notes, and any such market-making
may be discontinued at any time at the sole discretion of the Initial
Purchasers. In addition, such market-making activity will be subject to the
limits imposed by the Securities Act and the Exchange Act. Accordingly, no
assurance can be given as to the development or liquidity of any market for the
notes. We do not presently intend to apply for the listing of the notes on any
securities exchange or for inclusion of the notes in the automated quotation
system of the National Association of Securities Dealers, Inc.

                                     -17-


If you convert any notes, the value of the common stock you receive may
fluctuate significantly.

     Since our common stock has been publicly traded, its market price has
fluctuated significantly and may continue to do so in the future.  Significant
fluctuations in the market price of our common stock may occur in response to
various factors and events, including, among other things:

     .  the depth and liquidity of the trading market for our common stock

     .  quarterly variations in actual or anticipated operating results

     .  changes in estimates by securities analysts

     .  market conditions in the drug industry

     .  announcements and performance by competitors

     .  regulatory actions, and

     .  general economic conditions.


                                USE OF PROCEEDS

        We will not receive any proceeds from the sale by any selling
securityholder of the notes or the shares of common stock issuable upon
conversion of the notes.

                      RATIO OF EARNINGS TO FIXED CHARGES

     The ratio of earnings to fixed charges for each of the periods indicated is
as follows:




                                                                                                     Six months June 30,
                                                   Year Ended December 31,                                  ended
                                      -------------------------------------------------------         -----------------
                                      1996         1997         1998         1999        2000         2000         2001
                                      ----         ----         ----         ----        ----         ----         ----
                                                                                               
Ratio of earnings to fixed
charges(1)...................          --           --           --           --           --           --           --

_______________________________

(1)  For the purposes of computing ratio of earnings to fixed charges, earnings
consist of income (loss) before provision for income taxes plus fixed charges.
Fixed charges consist of interest charges and that portion of rental payments
under operating leases we believe to be representative of interest.  Earnings
for the years ended December 31, 1996, 1997, 1998, 1999 and 2000 and for the six
months ended June 30, 2000 and 2001, were insufficient to cover fixed charges by
$13,928, $23,026, $24,972, $41,481, $52,437, $23,154 and $27,698 (in thousands)
respectively.

                                     -18-


                           DESCRIPTION OF THE NOTES

     The 5.75% Convertible Subordinated Notes due June 15, 2008 were issued
under, and are governed by, an indenture (the Indenture) between us and State
Street Bank and Trust Company of California, N.A., as trustee. The Indenture and
the notes are governed by New York law. Because this section is a summary, it
does not describe every aspect of the notes and the Indenture. This summary is
subject to, and qualified in its entirety by, reference to all the provisions of
the Indenture, including definitions of certain terms used in the Indenture.
Wherever we refer to particular defined terms, those terms are incorporated
herein by reference. In this section, references to "CTI" "we" or "us" refer
solely to CTI and not to any of our subsidiaries.

General

     The notes are our general, unsecured obligations. The notes are
subordinated in right of payment, which means that they rank in right of payment
behind certain of our other indebtedness as described below. The notes are
limited to $150,000,000 aggregate principal amount. We are required to repay the
full principal amount of the notes on June 15, 2008, unless they are required to
be redeemed or repurchased on an earlier date by their terms.

     The notes bear interest at the annual rate shown on the front cover of this
prospectus from the date of issuance of the notes. We will pay interest twice a
year, on each June 15 and December 15 (each, an Interest Payment Date),
beginning December 15, 2001, until the principal is paid or made available for
payment or the notes have been converted. We will pay interest to the persons in
whose name the note is registered at the close of business on the immediately
preceding June 1 or December 1, as the case may be (each, a Regular Record
Date). Interest payable per $1,000 principal amount of notes for the period from
June 13, 2001 to December 15, 2001, will be $29.07. Interest will be calculated
on the basis of a 360-day year consisting of twelve 30-day months.

     You may convert the notes into shares of our common stock at any time
before the close of business on June 15, 2008, unless the notes have been
previously redeemed or repurchased. The initial conversion rate is stated on the
front cover of this prospectus. The conversion rate may be adjusted as described
below. Holders of notes called for redemption or submitted for repurchase are
entitled to convert the notes up to and including the business day immediately
preceding the date fixed for redemption or repurchase.

     We may redeem some or all of the notes at any time before June 21, 2004 at
a redemption price of $1,000 per $1,000 principal amount of notes, plus accrued
and unpaid interest, if any, to the redemption date, if (a) the closing price of
our common stock has exceeded 150% of the conversion price then in effect for at
least 20 trading days within a period of 30 consecutive trading days ending on
the trading day before the date of mailing of the provisional redemption notice
and (b) the registration statement of which this prospectus forms a part is
effective and available for use and is expected to remain effective and
available for use for the 30 days following the provisional redemption date,
unless registration is no longer required. We will make an additional payment in
cash with respect to the notes called for provisional redemption in an amount
equal to $172.50 per $1,000 principal amount of notes, less the amount of any
interest actually paid on the notes before the date of redemption. We may redeem
the notes at our option at any time on or after June 21, 2004, in whole or in
part, at the redemption prices set forth below under "--Optional Redemption by
CTI," plus accrued and unpaid interest to, but excluding, the redemption date.
If there is a Change in Control, as defined below, holders of the notes may have
the right to require us to repurchase their notes as described below under "--
Repurchase at Option of Holders Upon a Change in Control."

     No "sinking fund" is provided for the notes, which means that the Indenture
does not require us to redeem or retire the notes periodically.

                                     -19-


Form, Denomination, Transfer, Exchange and Book-Entry Procedures

The notes are issued:

 .    only in fully registered form

 .    without interest coupons, and

 .    in denominations of $1,000 and integral multiples thereof.

     Principal of, premium, if any, and interest (and Liquidated Damages, as
defined below, if any) on the notes will be payable, and the notes may be
presented for registration or exchange, at the office or agency we maintain for
such purpose in the Borough of Manhattan, The City of New York. Until we
designate otherwise, our office or agency will be the trustee's corporate trust
office presently located in the Borough of Manhattan, The City of New York.

     The notes are currently evidenced by one or more global notes that have
been deposited with the trustee as custodian for DTC and registered in the name
of Cede & Co. (Cede), as nominee of DTC.  Except as set forth below, record
ownership of the global note may be transferred, in whole or in part, only to
another nominee of DTC or to a successor of DTC or its nominee.

     The global note will not be registered in the name of any person, or
exchanged for notes that are registered in the name of any person, other than
DTC or its nominee, unless either of the following occurs:

 .    DTC has notified us that it is unwilling or unable to continue as
     depository for the global note or has ceased to be a clearing agency
     registered as such under the Exchange Act or announces an intention
     permanently to cease business or does in fact do so, or

 .    an Event of Default (as defined below) with respect to the notes
     represented by the global note has occurred and is continuing.

 .    In those circumstances, DTC will determine in whose names any notes issued
in exchange for the global note will be registered.

     DTC or its nominee is considered the sole owner and holder of the global
note for all purposes, and as a result:

 .    you cannot receive notes registered in your name if they are represented by
     the global notes

 .    you cannot receive certificated (physical) notes in exchange for your
     beneficial interest in the global notes

 .    you will not be considered to be the owner or holder of the global note or
     any note it represents for any purpose, and

 .    all payments on the global note will be made to DTC or its nominee.

                                     -20-


     The laws of some jurisdictions require that certain kinds of purchasers can
only own securities in physical, certificated form. These laws may limit your
ability to acquire interest in the notes and to transfer or encumber your
beneficial interests in the global note to these types of purchasers.

     Only institutions, such as a securities broker or dealer, that have
accounts with DTC or its nominee, called participants, and persons that may hold
beneficial interests through participants can own a beneficial interest in the
global note. The only place where the ownership of beneficial interests in the
global note appear and the only way the transfer of those interests can be made
is on the records kept by DTC (for its participants' interests) and the records
kept by those participants (for interests participants hold on behalf of other
persons).

     Secondary trading in bonds and notes of corporate issuers is generally
settled in clearinghouse (that is, next day) funds. In contrast, beneficial
interests in a global note usually trade in DTC's same day funds settlement
system, and settle in immediately available funds. We make no representation as
to the effect that settlement in immediately available funds will have on
trading activity in those beneficial interests.

     We will make cash payments of interest on, and the redemption or repurchase
price of, the global note, as well as any payment of Liquidated Damages, only to
Cede, the nominee for DTC, as the registered owner of the global notes. We will
make these payments by wire transfer of immediately available funds on each
payment date.

     We have been informed that, with respect to any cash payment of interest
on, principal of, or the redemption or repurchase price of, the global note, as
well as any payment of Liquidated Damages, DTC's practice is to credit
participants' accounts on the payment date with payments in amounts
proportionate to their respective beneficial interests in the notes represented
by the global note as shown on DTC's records, unless DTC has reason to believe
that it will not receive payment on that payment date. Payments by participants
to owners of beneficial interests in notes represented by the global notes held
through participants is the responsibility of those participants, as is now the
case with securities held for the accounts of customers registered in "street
name."

     We will send any redemption notices to the trustee. If fewer than all of
the notes are being redeemed, the particular ratio to be redeemed will be
selected by the trustee by a method that the trustee deems to be fair and
appropriate. We understand that if fewer than all of the global notes are to be
redeemed, DTC's current practice is to determine by lot the amount of the
holdings of each participant in the global notes to be redeemed.

     We also understand that neither DTC nor Cede will consent or vote with
respect to the notes. We have been advised that under its usual procedures, DTC
will mail an "omnibus proxy" to us as soon as possible after the record date.
The omnibus proxy assigns Cede's consenting or voting rights to those
participants to whose accounts the notes are credited on the record date
identified in a listing attached to the omnibus proxy.

     Because DTC can only act on behalf of participants, who in turn act on
behalf of indirect participants, the ability of a person having a beneficial
interest in the principal amount represented by the global note to pledge or
otherwise encumber their interest in the note to persons or entities that do not
participate in the DTC book entry system, or otherwise take actions in respect
of that interest, may be adversely affected by the lack of a physical
certificate evidencing its interest.

     DTC has advised us that it will take any action permitted to be taken by a
holder of notes (including the presentation of notes for exchange) only at the
direction of one or more participants to whose account with DTC interests in the
global note are credited and only in respect of such portion of the principal
amount of the

                                     -21-


notes represented by the global note as to which such participant has, or
participants have, given such direction.

     DTC has also advised us as follows: DTC is a limited purpose trust company
organized under the laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within the meaning of the Uniform
Commercial Code, as amended, and a "clearing agency" registered pursuant to the
provisions of Section 17A of the Exchange Act.  DTC was created to hold
securities for its participants and to facilitate the clearance and settlement
of securities transactions between participants through electronic book-entry
changes in accounts of its participants.  Participants include securities
brokers and dealers, banks, trust companies and clearing corporations and may
include certain other organizations.  Certain of such participants (or their
representatives), together with other entities, own DTC.  Indirect access to the
DTC system is available to other entities such as banks, brokers, dealers and
trust companies that clear through or maintain a custodial relationship with a
participant, either directly or indirectly.

     DTC's policies and procedures, which may change periodically, will apply to
payments, transfers, exchanges and other matters relating to beneficial
interests in the global note.  The trustee and we have no responsibility or
liability for any aspect of DTC's or any participant's records relating to
beneficial interests in the global note, including for payments made on the
global note, and we and the trustee are not responsible for maintaining,
supervising or reviewing any of those records.

Conversion Rights

     You may, at your option, convert the principal amount of any note that is
an integral multiple of $1,000 into shares of our common stock at any time prior
to the close of business on the maturity date, unless the note has been
previously redeemed or repurchased.  If the notes are called for redemption or
are subject to repurchase, you may convert your notes at any time before the
close of business on the business day immediately preceding the date fixed for
redemption or repurchase, as the case may be, unless we default in making the
payment due upon redemption or repurchase.  In each case, the initial conversion
rate is equal to 29.4118 shares per $1,000 principal amount of notes, which is
equivalent to an initial conversion price of approximately $34.00 per share.
The conversion rate is subject to adjustment as described below.

     The holder of a note can convert the note by delivering the note to the
trustee's corporate trust office, accompanied by a duly signed and completed
notice of conversion, a copy of which may be obtained from the trustee.  In the
case of a global note, we have been informed that DTC will effect the conversion
upon notice from the holder of a beneficial interest in the global note in
accordance with DTC's rules and procedures.  The conversion date will be the
date on which the note and the duly signed and completed notice of conversion
are so delivered to the trustee.  As promptly as practicable on or after the
conversion date, we will issue and deliver to the trustee a certificate or
certificates of the number of full shares of common stock issuable upon
conversion, together with payment in lieu of any factional shares, and the
trustee shall deliver the certificate(s) to the conversion agent for delivery to
the holder of the note being converted.  The shares of our common stock issuable
upon conversion of the notes will be fully paid and nonassessable.

     If you surrender a note for conversion on a date that is not an Interest
Payment Date, you will not be entitled to receive any interest for the period
from the preceding Interest Payment Date to the date of conversion, except as
described below.  However, if you are a holder of a note on a Regular Record
Date, including a note that is subsequently surrendered for conversion after the
Regular Record Date, you will receive the interest payable on such note on the
next Interest Payment Date.  To correct for this resulting overpayment of
interest, we will require that any note surrendered for conversion during the
period from the close of business on a Regular Record Date to the opening of
business on the next Interest Payment Date be accompanied by payment of an
amount equal to the interest payable on such Interest Payment Date on the
principal amount of notes being surrendered for conversion.  However, you will
not be required to make that payment if you are converting a note, or a portion
of a note, that we have called for redemption, or that you

                                     -22-


are entitled to require us to repurchase from you, if your conversion right
would terminate because of the redemption or repurchase between the Regular
Record Date and the close of business on the next Interest Payment Date.

     If we distribute rights or warrants (other than those referred to in clause
(2) below) pro rata to holders of common stock, so long as any such rights or
warrants have not expired or been redeemed by us, the holder of any note
surrendered for conversion will be entitled to receive upon such conversion, in
addition to the shares of common stock issuable upon such conversion (the
Conversion Shares), a number of rights or warrants to be determined as follows:

 .   if such conversion occurs on or prior to the date for the distribution to
    the holders of rights or warrants of separate certificates evidencing such
    rights or warrants, the Distribution Date, the same number of rights or
    warrants to which a holder of a number of shares of common stock equal to
    the number of Conversion Shares is entitled at the time of such conversion
    in accordance with the terms and provisions of, and applicable to, the
    rights or warrants, and

 .   if such conversion occurs after such Distribution Date, the same number of
    rights or warrants to which a holder of the number of shares of common stock
    into which such note was convertible immediately prior to such Distribution
    Date would have been entitled on such Distribution Date in accordance with
    the terms and provisions of, and applicable to, the rights or warrants.

     No other payment or adjustment for interest, or for any dividends on our
common stock, will be made upon conversion. If you receive common stock upon
conversion of a note, you will not be entitled to receive any dividends payable
to holders of common stock as of any record date before the close of business on
the conversion date. We will not issue fractional shares upon conversion of
notes. Instead, we will pay an amount in cash based on the closing sales price
of our common stock on the conversion date.

     If you deliver a note for conversion, you will not be required to pay any
taxes or duties in respect of the issuance or delivery of common stock on
conversion. However, you will be required to pay any tax or duty that may be
payable in respect of any transfer involved in the issuance or delivery of our
common stock in a name other than yours. We will not issue or deliver
certificates representing shares of common stock unless the person requesting
the issuance or delivery has paid to us the amount of any such tax or duty or
has established to our satisfaction that no such tax or duty is payable.

     The conversion rate is subject to adjustment if, among other things:

     (1)  there is a dividend or other distribution payable in common stock on
          shares of our common stock,

     (2)  we issue to all holders of common stock rights, options or warrants
          entitling them to subscribe for or purchase common stock at less than
          the then current market price, calculated as described in the
          Indenture, of our common stock; however, if those rights, options or
          warrants are only exercisable upon the occurrence of specified
          triggering events, then the conversion rate will not be adjusted until
          the triggering events occur,

     (3)  we subdivide, reclassify or combine our common stock,

     (4)  we distribute to all holders of our common stock evidences of our
          indebtedness, shares of capital stock, cash or assets, including
          securities, but excluding:

          .  those dividends, rights, options, warrants and distributions
             referred to in paragraphs (1) and (2) above


               .  dividends and distributions paid in cash (except as set forth
                  in paragraphs (5) and (6) below), and

               .  distributions upon a merger or consolidation as discussed
                  below,

          (5)  we make a distribution consisting exclusively of cash (excluding
               portions of distributions referred to in clause (4) above and
               cash distributed upon a merger or consolidation as discussed
               below) to all holders of our common stock if the aggregate amount
               of the distribution combined together with (A) other such all
               cash distributions made within the preceding 365-day period in
               respect of which no adjustment has been made and (B) any cash and
               the fair market value of other consideration payable in respect
               of any tender offer by us or any of our subsidiaries for our
               common stock concluded within the preceding 365-day period in
               respect of which no adjustment has been made, exceeds 10% of our
               market capitalization, being the product of the current market
               price per share of our common stock on the record date for such
               distribution and the number of shares of common stock then
               outstanding, or

          (6)  the successful completion of a tender offer made by us or any of
               our subsidiaries for our common stock that involves aggregate
               consideration that, together with (A) any cash and the fair
               market value of other consideration payable in a tender offer by
               us or any of our subsidiaries for our common stock concluded
               within the 365-day period preceding the completion of such tender
               offer in respect of which no adjustment has been made and (B) the
               aggregate amount of any such all cash distributions referred to
               in paragraph (5) above to all holders of common stock within the
               365-day period preceding the expiration of such tender offer in
               respect of which no adjustments have been made, exceeds 10% of
               our market capitalization on the expiration of such tender offer.

          To the extent that our rights plan is still in effect, upon conversion
of the notes into common stock, the holders will receive, in addition to the
common stock, the rights described in our rights plan, whether or not the rights
have separated from the common stock at the time of conversion, subject to
certain limited exceptions. See "Description of Capital Stock." If we implement
a new rights plan, we are required under the Indenture to provide that the
holder of notes will receive the rights upon conversion of the notes, whether or
not these rights were separated from the common stock prior to conversion,
subject to certain limited exceptions.

          We reserve the right to make such increases in the conversion rate in
addition to those required by the provisions described above as we may consider
to be advisable so that any event treated for United States federal income tax
purposes as a dividend of stock or stock rights will not be taxable to the
recipients. We will not be required to make any adjustment to the conversion
rate until the cumulative required adjustments amount to 1.0% or more of the
conversion rate. We will compute any adjustments to the conversion rate and give
notice to the holders of any such adjustments.

          If we merge into or consolidate with another person or sell or
transfer all or substantially all of our assets, each note then outstanding
will, without the consent of the holder of any note, become convertible only
into the kind and amount of securities, cash and other property receivable upon
such consolidation, merger, sale or transfer by a holder of the number of shares
of, common stock into which the note was convertible immediately prior to the
merger, consolidation or sale. This calculation will be made based on the
assumption that the holder of common stock failed to exercise any rights of
election that the holder may have had to select a particular type of
consideration. The adjustment will not be made for a merger that does not result
in any reclassification, conversion, exchange or cancellation of our common
stock.

          We may, from time to time, increase the conversion rate by any amount
for any period of at least 20 days if our board of directors has determined that
such increase would be in our best interests. Any such determination will be
conclusive. We will give holders of notes at least 15 days' notice of this
increase in the

                                     -24-


conversion rate. No such increase will be taken into account for purposes of
determining whether the closing price of the common stock exceeds the conversion
price by 105% in connection with an event which otherwise would be a Change in
Control as discussed below.

     If at any time we make a distribution of property to our stockholders that
would be taxable to them as a dividend for United States federal income tax
purposes (for example, distributions of evidences of indebtedness or assets by
us, but generally not stock dividends on common stock or rights to subscribe for
common stock) and, pursuant to the anti-dilution provisions of the Indenture,
the number of shares into which notes are convertible is increased, that
increase may be deemed for United States federal income tax purposes to be the
payment of a taxable dividend to holders of notes. For more details, see
"Certain Federal Income Tax Considerations."

Subordination

     The payment of the principal of, premium, if any, and interest on the
notes, including any Liquidated Damages, and any amounts payable upon the
redemption or repurchase of the notes, is subordinated in right of payment to
the extent set forth in the Indenture to the prior payment in full of all of our
Senior Debt.  The notes are also effectively subordinated to any debt or other
liabilities of our subsidiaries.  On June 30, 2001, we had $1.9 million of
outstanding senior debt.

     "Senior Debt" means the principal of, and premium, if any, and interest,
including all interest accruing subsequent to the commencement of any bankruptcy
or similar proceeding, whether or not a claim for post-petition interest is
allowable as a claim in any such proceeding, on, and rent payable on or in
connection with and all fees, costs, claims, expenses and other amounts payable
in connection with, the following, whether absolute or contingent, secured or
unsecured, due or to become due, outstanding on the date of the Indenture or
thereafter created, incurred or assumed:

     .    all our indebtedness evidenced by a credit or loan agreement, note,
          bond, debenture or other similar instrument whether or not the
          recourse of the lender is to all of our assets or to only a portion

     .    all of our indebtedness, obligations and other liabilities, contingent
          or otherwise, for borrowed money, including, without limitation,
          overdrafts, foreign exchange contracts, currency exchange agreements,
          interest rate protection agreements and any loans or advances from
          banks, whether or not evidenced by notes or similar instruments, or
          bonds, notes, notes or similar instruments, whether or not the
          recourse of the lender is to all of our assets or to only a portion
          thereof

     .    all our obligations as lessee under leases required to be capitalized
          on the balance sheet of the lessee under generally accepted accounting
          principals

     .    all our obligations under leases for facilities, equipment or other
          assets entered into for financing purposes, whether or not capitalized

     .    all our obligations and other liabilities, contingent or otherwise,
          under any lease or related document, including a purchase agreement,
          in connection with the lease of real property or improvements, or any
          personal property included as part of any such lease, which provides
          that we are contractually obligated to purchase or cause a third party
          to purchase the leased property and thereby guarantee a residual value
          of leased property to the lessor and all of our obligations under such
          lease or related document to purchase or to cause a third party to
          purchase the leased property, whether or not such lease transaction is
          characterized as an operating lease or capitalized lease in accordance
          with generally accepted accounting principles

                                     -25-


     .    all our obligations under interest rate and currency swaps, caps,
          floors, collars, hedge agreements, forward contracts or similar
          agreements or arrangements

     .    all our obligations with respect to letters of credit, bank
          guarantees, bankers' acceptances and similar facilities, including
          related reimbursement obligations

     .    all our obligations issued or assumed as the deferred purchase price
          of property or services, but excluding trade accounts payable and
          accrued liabilities arising in the ordinary course of business

     .    all our obligations of the type referred to above of another person
          and all dividends of another person, the payment of which, in either
          case, we have assumed or guaranteed, or for which we are responsible
          or liable, directly or indirectly, jointly or severally, as obligor,
          guarantor or otherwise, or which are secured by a lien on our
          property, and

     .    renewals, extensions, modifications, replacements, restatements and
          refundings of, or any indebtedness or obligation issued in exchange
          for any indebtedness or obligation described in the bullets above.

Senior Debt will not include:

     .    the notes

     .    any indebtedness or obligation if the terms of the indebtedness or
          obligation, or the terms of the instrument under which the
          indebtedness or obligation is issued, expressly provide that the
          indebtedness or obligation is not superior in right of payment to the
          notes

     .    accounts payable or other accrued liability or obligation incurred in
          the ordinary course of business in connection with the obtaining of
          materials or services, or

     .    any indebtedness or obligation that we may owe to any of our direct or
          indirect subsidiaries.

We will not make any payment on account of the notes if any of the following
occurs:

     .    we default in our obligations to pay principal, premium, interest or
          other amounts on or in connection with our Senior Debt, including a
          default under any redemption or repurchase obligation (a Payment
          Default), and the default continues beyond any grace period that we
          may have to make those payments, or

     .    a default (other than a Payment Default) occurs and is continuing on
          any Designated Senior Debt that permits the holders of the Designated
          Senior Debt to accelerate its maturity and the trustee has received a
          payment blockage notice from us, the holder of such debt or such other
          person permitted to give such notice under the Indenture.

     If payments of the notes have been blocked by a Payment Default, payments
on the notes may resume (including missed payments, if any) when the Payment
Default has been cured or waived. If payments on the notes have been blocked by
a non-payment default, payments on the notes may resume (including missed
payments, if any) on the earlier of (1) the date on which such default is cured
or waived and (2) 179 days after the date on which the trustee receives the
payment blockage notice if the maturity of the Designated Senior Debt has not
been accelerated such that such debt is then presently payable, unless the
Indenture otherwise prohibits payment at that time.

                                     -26-


     No non-payment default that existed on the day a payment blockage notice
was delivered to the trustee can be used as the basis for any subsequent payment
blockage notice unless that existing non-payment default has been cured for a
period of at least 90 days. In addition, once a holder of Designated Senior Debt
has blocked payment on the notes by giving a payment blockage notice, no new
period of payment blockage can be commenced until both of the following are
satisfied:

     .  365 days have elapsed since the effectiveness of the immediately prior
        payment blockage notice, and

     .  all scheduled payments of principal, any premium and interest (and
        Liquidated Damages, if any) on the notes that have come due have been
        paid full in cash.

     "Designated Senior Debt" means our obligations under any particular Senior
Debt in which the instrument creating or evidencing the debt, or the assumption
or guarantee of the debt, or related agreements or documents to which we are a
party, expressly provides that the indebtedness is Designated Senior Debt for
purposes of the Indenture. That instrument, agreement or other document may
place limitations and conditions on the right of that Senior Debt to exercise
the rights of Designated Senior Debt.

     In addition, upon any acceleration of the principal due on the notes as a
result of an Event of Default or payment or distribution of our assets to
creditors upon any dissolution, winding up, liquidation or reorganization,
whether voluntary or involuntary, marshaling of assets, assignment for the
benefit of creditors, or in bankruptcy, insolvency, receivership or other
similar proceedings, all principal, premium, interest and other amounts due on
or in connection with all Senior Debt must be paid in full in cash or cash
equivalents before you will be entitled to receive any payment. Due to the
subordination provisions of the notes and the Indenture, in the event of
insolvency, our creditors who are holders of Senior Debt may recover more,
ratably, than you would, and this subordination may reduce or eliminate payments
to you.

     The notes are effectively subordinated to all indebtedness and other
liabilities, including trade payables and lease obligations, and preferred stock
of any of our subsidiaries. This occurs because any right we have to receive any
assets of our subsidiaries upon their liquidation or reorganization, and the
consequent right of the holders of the notes to participate in those assets, are
effectively subordinated to the claims of that subsidiary's creditors, including
trade creditors, and preferred stockholders, except to the extent that we are
recognized as a creditor of the subsidiary, in which case our claims would still
be subordinate to any security interest in the subsidiary's assets and any
indebtedness of the subsidiary senior to that which we hold, at least to the
extent of the collateral for such indebtedness.

     The Indenture does not limit our ability to incur indebtedness, including
Senior Debt, or the ability of any of our subsidiaries to incur indebtedness.

Optional Redemption by CTI

     On or after June 21, 2004, we may redeem the notes, in whole or in part, at
our option, at the redemption prices specified below. The redemption price,
expressed as a percentage of principal amount, is as follows for the 12-month
periods beginning on June 15 of the following years (June 21 through June 14 in
the case of the first of such periods):



                                                                 Redemption
Year                                                             Price
- ----                                                             -----
                                                              
2004..........................................................   103.286%
2005..........................................................   102.464%
2006..........................................................   101.643%
2007..........................................................   100.821%



                                     -27-



and thereafter is equal to 100% of the principal amount.

     In each case, we will also pay accrued interest to, but excluding, the
redemption date. The Indenture requires us to give notice of redemption not more
than 60 and not less than 30 days before the redemption date.

Provisional Redemption

     We may redeem the notes, in whole or in part, at any time before June 21,
2004, at a redemption price equal to $1,000 per $1,000 principal amount of the
notes to be redeemed plus accrued and unpaid interest, if any, to, but
excluding, the date of redemption if (a) the closing price of our common stock
has exceeded 150% of the conversion price then in effect for at least 20 trading
days within a period of 30 consecutive trading days ending on the trading day
before the date of mailing of the provisional redemption notice, and (b) the
shelf registration statement of which this prospectus forms a part covering
resales of the notes and the common stock issuable upon conversion of the notes
is effective and available for use and is expected to remain effective and
available for use for the 30 days following the provisional redemption date,
unless registration is no longer required. Upon any provisional redemption, we
will make an additional payment in cash or, at our option, common stock, or in a
combination of cash and common stock, with respect to the notes called for
redemption in an amount equal to $172.50 per $1,000 principal amount of the
notes, less the amount of any interest actually paid on the notes before the
date of redemption. For purposes of any such payment in common stock, the value
of such common stock will be based upon the closing price of our common stock as
set forth in this paragraph. We will be obligated to make this additional
payment on all notes called for provisional redemption, including any notes
converted after the notice date and before the provisional redemption date.
Because the number of shares of common stock to be delivered to holders of notes
in payment of the repurchase price (should we elect such payment option) is
determined on the basis of the market price of our common stock after we have
given notice of the occurrence of the Change in Control and prior to the
repurchase date, the value of the shares of common stock on the date of delivery
thereof to such holders may be more or less than the repurchase price had we
elected to pay such price in cash.

Repurchase at Option of Holders Upon a Change in Control

     If a Change in Control occurs, you have the right, at your option, to
require us to repurchase all of your notes not called for redemption, or any
portion of the principal amount of your notes that is equal to $1,000 or any
greater integral multiple of $1,000. The price we are required to pay is 100% of
the principal amount of the notes to be repurchased, together with interest
accrued to the repurchase date.

     At our option, instead of paying the repurchase price in cash, we, or the
successor entity in the Change in Control transaction, may pay the repurchase
price in common stock, or in a combination of cash and common stock, such common
stock to be valued at 95% of the average of the closing sales prices of the
shares of common stock for each of the five trading days ending with the third
trading day prior to the repurchase date. We may only pay the repurchase price
in common stock if the conditions provided in the Indenture are satisfied.
Because the number of shares of common stock to be delivered to holders of notes
in payment of the repurchase price (should we elect such payment option) is
determined on the basis of the market price of our common stock after we have
given notice of the occurrence of the Change in Control and prior to the
repurchase date, the value of the shares of common stock on the date of delivery
thereof to such holders may be more or less than the repurchase price had we
elected to pay such price in cash.

     Within 30 days after the occurrence of a Change in Control, we will mail
you notice of the Change in Control and of your repurchase right arising as a
result of the Change in Control. We will also deliver a copy of this notice to
the trustee. To exercise the repurchase right, you must deliver, on or before
the 30th day (or such greater period as may be required by applicable law) after
the date of our notice, irrevocable written notice to the trustee of your
exercise of your repurchase right, together with the notes with respect to which


                                     -28-


that right is being exercised. We are required to make the repurchase on a date
that is no later than 45 days after your notice to the trustee.

          A Change in Control is deemed to have occurred at such time any of the
following occurs:

     (1)  any person, including any syndicate or group deemed to be a "person"
          under Section 13(d)(3) of the Exchange Act, (A) acquires beneficial
          ownership, directly or indirectly, through a purchase, merger or other
          acquisition transaction or series of transactions, of shares of our
          capital stock entitling that person to exercise more than 50% of the
          total voting power of all shares of our capital stock entitled to vote
          generally in elections of directors; however, any acquisition by us,
          any of our subsidiaries or any of our employee benefit plans will not
          trigger this provision or (B) succeeds in having sufficient of its
          nominees (who are not supported by a majority of the then current
          board of directors) elected to the board of directors such that such
          nominees, when added to any existing directors remaining on the board
          of directors after such election who are affiliates of or acting in
          concert with such person, shall constitute a majority of the board of
          directors,

     (2)  we consolidate with or merge with or into any other person or another
          person merges into us, except if the transaction satisfies any of the
          following:

          .  the transaction is a merger (A) that does not result in any
             reclassification, conversion, exchange or cancellation of
             outstanding shares of our capital stock and (B) pursuant to which
             holders of our common stock immediately prior to the transaction
             have, directly or indirectly, 50% or more of the total voting power
             of all shares of capital stock or other ownership interest of the
             continuing or surviving person entitled to vote generally in
             elections of directors of the continuing or surviving person
             immediately after the transaction, or

          .  the transaction is a merger effected only to change our
             jurisdiction of incorporation and it results in a reclassification,
             conversion or exchange of outstanding shares of our common stock
             only into shares of common stock of us or another corporation, or

     (3)  we convey, transfer, sell, lease or otherwise dispose of all or
          substantially all of our assets to another person.

          However, a Change in Control is not deemed to have occurred if the
average of the high and low sales price per share of our common stock for any
five trading days within (A) the period of 10 consecutive trading days ending
immediately after the later of the Change in Control and the public announcement
of the Change in Control, in the case of a Change in Control relating to an
acquisition of capital stock not involving a merger or consolidation covered by
clause (B) below, or (B) the period of 10 consecutive trading days ending
immediately before the Change in Control, in the case of Change in Control
relating to a merger, consolidation or asset sale, in each case, equals or
exceeds 105% of the conversion price of the notes in effect on each of those
trading days.

For purposes of these provisions:

 .         the conversion price is equal to $1,000 divided by the conversion
          rate, and

 .         whether a person is a beneficial owner will be determined in
          accordance with Rule 13d-3 under the Exchange Act.

          Any repurchase of notes arising as a result of the Change in Control
will be made in compliance with all applicable laws, rules and regulations,
including, if applicable Regulation 14E under the Exchange Act and the rules
thereunder and all other applicable federal and state securities laws. To the
extent the provisions of


                                     -29-


any securities laws or regulations conflict with the provisions of this
covenant, our compliance with such laws and regulations shall not be deemed to
cause a breach of our obligations under the Indenture.

     We may, to the extent permitted by applicable law, at any time purchase
notes in the open market or by tender or by private agreement. Any note that we
so purchase may, to the extent permitted by applicable law, be reissued or
resold or may, at our option, be surrendered to the trustee for cancellation.
Any notes surrendered may not be reissued or resold and will be canceled
promptly.

     The definition of Change in Control includes a phrase relating to the
conveyance, transfer, sale, lease or disposition of all or substantially all of
our assets. There is no precise, established definition of the phrase
substantially all under applicable law. Accordingly, your ability to require us
to repurchase your notes as a result of conveyance, transfer, sale, lease or
other disposition of less than all of our assets may be uncertain.

     The foregoing provisions would not necessarily provide you with protection
if we are involved in a highly leveraged or other transaction that may adversely
affect you.

     Our ability to repurchase notes upon the occurrence of a Change in Control
is subject to important limitations.  Some of the events constituting a Change
in Control could cause an event of default or be prohibited or limited by the
terms of Senior Debt.  As a result, any repurchase of the notes in cash would,
absent a waiver, be prohibited under the Indenture's subordination provisions
until the Senior Debt is paid in full.  Further, we may not have the financial
resources, or would be unable to arrange financing, to pay the repurchase price
for all the notes that holders seeking to exercise their repurchase right
deliver to us.  If we were to fail to repurchase the notes when required
following a Change in Control, an Event of Default would occur, whether or not
such repurchase is permitted by the Indenture's subordination provisions.  Any
such default may, in turn, cause a default under our Senior Debt.  For more
details, see "--Subordination."

Mergers and Sales of Assets

     Without the consent of the holders of the notes, we may not consolidate
with or merge into any other person or convey, transfer, sell or lease our
properties and assets substantially as an entirety to any person, and we may not
permit any person to consolidate with or merge into us or convey, transfer, sell
or lease such person's properties and assets substantially as an entirety to us,
unless each of the following requirements is met:

 .    the person formed by the consolidation or into or with which we merge or
     the person to which our properties and assets are conveyed, transferred,
     sold or leased, is (A) a corporation, limited liability company,
     partnership or trust organized and existing under the laws of the United
     States, any State or the District of Columbia or (B) organized under the
     laws of a jurisdiction outside the U.S. and has common stock or American
     Depositary Shares representing such common stock traded on a national
     securities exchange in the U.S., including The Nasdaq Stock Market, Inc.
     and, in each case, if other than us, expressly assumes the due and punctual
     payment of the principal of, any premium, and interest (and Liquidated
     Damages, if any) on the notes and the performance of our other covenants
     under the Indenture

 .    immediately after giving effect to that transaction, no Event of Default,
     and no event that, after notice or lapse of time or both, would become an
     Event of Default, shall have occurred and be continuing, and other specific
     conditions are met Upon any consolidation or merger or any transfer of all
     or substantially all of our assets, the successor corporation formed by
     such consolidation or into which we are merged or to which such transfer is
     made, shall succeed to, and be substituted for, and may exercise every
     right and power of, us under the Indenture with the same effect as if such
     successor corporation had been named in the Indenture as our company, and
     we shall be released from the


                                     -30-


     obligations under the notes and the Indenture except with respect to any
     obligations that arise from, or are related to, such transaction.

Events of Default

The following are Events of Default under the Indenture:

 .    we fail to pay principal of or any premium on any note when due, whether or
     not the payment is prohibited by the Indenture's subordination provisions

 .    we fail to pay any interest on any note when due and that default continues
     for 30 days, whether or not the payment is prohibited by the Indenture's
     subordination provisions

 .    we fail to give the notice that we are required to give if there is a
     Change in Control, whether or not the notice is prohibited by the
     Indenture's subordination provisions

 .    we fail to perform any other covenant in the Indenture and that failure
     continues for 60 days after written notice to us by the trustee or the
     holders of at least 25% in aggregate principal amount of outstanding notes

 .    we fail to pay when due the principal of any indebtedness for money
     borrowed by us or any of our significant subsidiaries, if any, in excess of
     $10 million if the indebtedness is not discharged and such failure
     continues for 30 days or more, or, if such indebtedness has been
     accelerated, such acceleration is not annulled, within 30 days after
     written notice to us by the trustee or the holders of at least 25% in
     aggregate principal amount of the outstanding notes, and

 .    certain events of bankruptcy, insolvency or reorganization with respect to
     us and our significant subsidiaries specified in the Indenture.

     Subject to the provisions of the Indenture relating to the trustee's
duties, if an Event of Default exists, the trustee will not be obligated to
exercise any of its rights or powers under the Indenture at the request or
direction of any of the holders, unless they have offered to the trustee
reasonable indemnity. Subject to such trustee indemnification provisions, the
holders of a majority in aggregate principal amount of the outstanding notes
will have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the trustee or exercising any trust or
power conferred on the trustee, provided that such direction does not conflict
with any rule of law or with the Indenture, and the trustee may take any other
action the trustee deems proper which is not inconsistent with such direction.

     If an Event of Default, other than an Event of Default arising from events
of bankruptcy, insolvency or reorganization, occurs and is continuing, either
the trustee or the holders of at least 25% in principal amount of the
outstanding notes may accelerate the maturity of all notes. After acceleration,
but before a judgment or decree based on acceleration, the holders of a majority
in aggregate principal amount of outstanding notes may, under circumstances set
forth in the Indenture, rescind the acceleration if all Events of Default, other
than the non-payment of principal of the notes which have become due solely
because of the acceleration, have been cured or waived as provided in the
Indenture. If an Event of Default arising from events of bankruptcy, insolvency
or reorganization occurs and is continuing, then the principal of, and accrued
interest (and Liquidated Damages, if any) on, all of the notes will
automatically become immediately due and payable without any declaration or
other act on the part of the holders of the notes or the trustee.

     You do not have any right to institute any proceeding relating to the
Indenture, or to appoint a receiver or a trustee, or for any other remedy under
the Indenture, unless:


                                     -31-


 .    you have given the trustee written notice of a continuing Event of Default

 .    the registered holders of at least 25% of the aggregate principal amount of
     all outstanding notes have made a written request of the trustee to take
     action because of the default and have furnished reasonable indemnification
     to the trustee against the cost, liabilities and expenses of taking such
     action

 .    the trustee shall not have taken action for 60 days after receiving such
     notice and offer of indemnification

 .    the trustee has not received any direction inconsistent with such written
     request from the holders of a majority of the aggregate principal amount of
     all outstanding notes during such 60-day period

     These limitations do not apply to a suit for the enforcement of payment of
the principal of, or any premium or interest (and Liquidated Damages, if any)
on, a note, or the repurchase price payable for a note on or after the due dates
for such payments, or of the right to convert the note in accordance with the
Indenture.

     We will furnish to the trustee annually a statement as to our performance
of our obligations under the Indenture and as to any default in performance.

Modification and Waiver

     The Indenture contains provisions permitting us and the trustee to enter
into a supplemental indenture for certain limited purposes without the consent
of the holders of the notes. With the consent of the holders of not less than a
majority in aggregate principal amount of the notes at the time outstanding, we
and the trustee are permitted to amend or supplement the Indenture or any
supplemental indenture or modify the rights of the holders, provided, that no
such modification may, without the consent of each holder affect thereby:

 .    change the stated maturity of the principal or interest of any note

 .    reduce the principal amount, any premium or interest on any note

 .    reduce the amount payable on any note upon a redemption at our option

 .    amend or modify our obligation to make or consummate a repurchase offer
     upon a Change in Control after our obligation to make a Change in Control
     repurchase offer arises

 .    change the place or currency of payment on any note

 .    impair the right to institute suit for the enforcement of any payment on
     any note

 .    modify the subordination provisions in a manner that is adverse to the
     holder of any notes

 .    adversely affect the right of any holder of notes to convert its notes

 .    reduce the percentage of holders whose consent is needed to modify, amend
     or waive any provision in the Indenture, or

 .    modify the provisions dealing with modification and waiver of the
     Indenture, except to increase any required percentage or to provide that
     certain other provisions of the Indenture cannot be modified or waived
     without the consent of the holder of each outstanding note affected
     thereby.


                                     -32-


          The holders of a majority in principal amount of the outstanding notes
may waive our compliance with certain restrictive provisions of the Indenture.
The holders of a majority in principal amount of the outstanding notes may waive
any past default, except a default in the payment of principal, any premium,
interest or the repurchase price (or Liquidated Damages, if any).

          Notes will not be considered outstanding if money for their payment or
redemption has been deposited or set aside in trust for the holders.

Registration Rights

          We entered into a registration rights agreement (the Registration
Rights Agreement) with CIBC World Markets Corp., Banc of America Securities LLC
and U.S. Bancorp Piper Jaffray (the Initial Purchasers) on June 13, 2001. In the
Registration Rights Agreement we agreed, for the benefit of the holders of the
notes and the shares of common stock issuable upon conversion of the notes,
commonly referred to as the Registrable Securities, but excluding securities
that are eligible for disposition under Rule 144 of the Securities Act, that we
would, at our expense:

  .    file with the SEC, on or prior to 90 days following June 13, 2001, the
       date the notes were originally issued, a shelf registration statement
       covering resales of the Registrable Securities

  .    use our reasonable efforts to cause the shelf registration statement to
       be declared effective under the Securities Act on or prior to 180 days
       following June 13, 2001, the date the notes were originally issued,
       subject to our right to postpone having the shelf registration statement
       declared effective for an additional 60 days in limited circumstances,
       and

  .    use our reasonable efforts to keep effective the shelf registration
       statement until:

    (1)   the expiration of the holding period applicable to such securities
          held by persons who are not affiliates of CTI under Rule 144(k) under
          the Securities Act or any successor previously subject to specific
          permitted exceptions (the Effectiveness Period), or

    (2)   if earlier, there are no outstanding Registrable Securities.

          We agreed to provide to each holder of Registrable Securities copies
of this prospectus, notify each holder when the shelf registration statement has
become effective and take certain other actions required to permit public
resales of the Registrable Securities.

          Upon written notice to all the holders of notes, we will be permitted
to suspend the use of the prospectus that is part of the shelf registration
statement in connection with sales of Registrable Securities during prescribed
periods of time if we possess material non-public information the disclosure of
which would have a material adverse effect on us. The periods during which we
can suspend the use of the prospectus may not exceed a total of 60 consecutive
days. Upon receipt of such notice, the holders of notes are required to cease
disposing of securities under the prospectus and to keep the notice
confidential.

          Liquidated damages (Liquidated Damages) will accrue on the notes that
are transfer restricted securities under the Registration Rights Agreement if
any of the following events, which we refer to as Registration Defaults, occurs:

  .    on or prior to 90 days following June 13, 2001, the date the notes were
       originally issued, a shelf registration statement has not been filed with
       the SEC


                                     -33-


     .  on or prior to 180 days following June 13, 2001, the date the notes were
        originally issued, the SEC does not declare the shelf registration
        statement effective, or

     .  the shelf registration statement ceases to be effective, or we otherwise
        prevent or restrict holders of Registrable Securities from making sales
        under the shelf registration statement, for more than 60 consecutive
        days.

          In any case, Liquidated Damages will accrue on the notes that are
transfer restricted securities at a rate of 0.5% of the principal amount per
annum from and including the day following the Registration Default to, but
excluding, the day on which the Registration Default is cured. Liquidated
Damages will be paid semi-annually in arrears, with the first semi-annual
payment due on the first Interest Payment Date following the date on which the
Liquidated Damages begin to accrue. Under no circumstances will we be required
to accrue liquidated damages in excess of 0.5% per annum at any time.

          A holder who elects to sell any Registrable Securities pursuant to the
shelf registration statement will be required to be named as a selling
securityholder in the related prospectus, may be required to deliver a
prospectus to purchasers, may be subject to certain civil liability provisions
under the Securities Act in connection with those sales and will be bound by the
provisions of the Registration Rights Agreement that apply to a holder making
such an election, including certain indemnification provisions.

          We mailed a notice and questionnaire to the holders of Registrable
Securities not fewer than 30 calendar days prior to the time we intend in good
faith to have the shelf registration statement declared effective (the Effective
Time).

          No holder of Registrable Securities was entitled to be named as a
selling securityholder in the shelf registration statement as of the Effective
Time, and no holder of Registrable Securities was entitled to use the prospectus
forming a part of the shelf registration statement for offers and resales of
Registrable Securities at any time, unless such holder had returned a completed
and signed notice and questionnaire to us by the deadline for response set forth
in the notice and questionnaire. Holders of Registrable Securities had, however,
at least 20 calendar days from the date on which the notice and questionnaire
was first mailed to them to return a completed and signed notice and
questionnaire to us.

          Beneficial owners of Registrable Securities who had not returned a
notice and questionnaire by the questionnaire deadline described above may
receive another notice and questionnaire from us upon request. When we receive a
completed and signed notice and questionnaire prior to the Effective Date of the
Registration Statement, we will include the Registrable Securities covered
thereby in the shelf registration statement, subject to restrictions on the
timing and number of supplements to the shelf registration statement provided in
the Registration Rights Agreement.

          We agreed in the Registration Rights Agreement to use our reasonable
efforts to cause the shares of common stock issuable upon conversion of the
notes to be quoted on the Nasdaq National Market. However, if the common stock
is not then quoted on the Nasdaq National Market, we will use our reasonable
efforts to cause the shares of common stock issuable upon conversion of the
notes to be quoted or listed on whichever market or exchange the common stock is
then quoted or listed, if any, on or prior to the effectiveness of the shelf
registration statement.

          This summary of certain provisions of the Registration Rights
Agreement is not complete and is subject to, and qualified in its entirety by
reference to, all the provisions of the Registration Rights Agreement, a copy of
which we will make available to beneficial owners of the notes upon request to
us.

          We gave notice to holders of the notes by mail to the addresses of the
holders as they appear in the Security Register. Notices will be deemed to have
been given on the date of mailing.


                                     -34-


Replacement of Notes

     We will replace, at the holders' expense, notes that become mutilated,
destroyed, stolen or lost upon delivery to the trustee of the mutilated notes or
evidence of the loss, theft or destruction thereof satisfactory to us and the
trustee. In the case of a lost, stolen or destroyed note, indemnity satisfactory
to the trustee and us may be required at the expense of the holder of the note
before a replacement note will be issued.

No Personal Liability of Stockholders, Officers, Directors and Employees

     No direct or indirect stockholder, officer, director or employee, as such,
past, present or future of CTI, or any successor entity, shall have any personal
liability in respect of our obligations under the Indenture or the notes solely
by reason of his or its status as such stockholder, officer, director or
employee.

The Trustee

     The trustee for the holders of notes issued under the Indenture is State
Street Bank and Trust Company of California, N.A. If an Event of Default occurs,
and is continuing, the trustee is required to use the degree of care of a
prudent person in the conduct of his own affairs in the exercise of its powers.
Subject to these provisions, the trustee is under no obligation to exercise any
of its rights or powers under the Indenture at the request of any holders of
notes, unless they have offered the trustee reasonable security or indemnity.


                                     -35-




                         DESCRIPTION OF CAPITAL STOCK

     This summary does not purport to be complete and is subject to, and
qualified in its entirety by, the provisions of our restated articles of
incorporation, as amended, and all applicable provisions of Washington law.

General

     We are authorized to issue 100,000,000 shares of common stock, no par
value, and 10,000,000 shares of preferred stock, no par value.

Common Stock

     Each holder of common stock is entitled to one vote for each share held on
all matters to be voted upon by the shareholders and there are no cumulative
voting rights.  Subject to preferences that may be applicable to any outstanding
preferred stock, holders of common stock are entitled to receive ratably the
dividends, if any, that are declared from time to time by the board of directors
out of funds legally available for that purpose.  In the event of a liquidation,
dissolution or winding up of the company, the holders of common stock are
entitled to share in our assets remaining after the payment of liabilities and
the satisfaction of any liquidation preference granted to the holders of any
outstanding shares of preferred stock.  Holders of common stock have no
preemptive or conversion rights or other subscription rights.  There are no
redemption or sinking fund provisions applicable to the common stock.  All
outstanding shares of common stock are fully paid and nonassessable.  The
rights, preferences and privileges of the holders of common stock are subject
to, and may be adversely affected by, the rights of the holders of shares of any
series of preferred stock that we may designate in the future.

Preferred Stock

     The board of directors has the authority, without action by the
shareholders, to designate and issue preferred stock in one or more series and
to designate the rights, preferences and privileges of each series, which may be
greater than the rights of the common stock.  It is not possible to state the
actual effect of the issuance of any shares of preferred stock upon the rights
of holders of the common stock until the board of directors determines the
specific rights of the holders of this preferred stock.  However, the effects
might include, among other things:

 .  restricting dividends on the common stock

 .  diluting the voting power of the common stock

 .  impairing the liquidation rights of the common stock, or

 .  delaying or preventing a change in control of the company without further
   action by the shareholders.

     We designated 100,000 shares of our preferred stock as Series C preferred
stock in November 1996 in connection with the adoption of a shareholder rights
plan as described below.  In November 1999, we designated 10,000 shares of our
preferred stock as 5% Series D preferred stock in connection with a private
placement of those shares.  The Series D has a 5% annual dividend and is
redeemable upon certain events, including a change of control of the company.
Each holder of Series D preferred stock is entitled to one vote for each share
of common stock into which the preferred stock could then be converted.  The
Series D preferred stock is convertible into common stock at the election of the
holder at any time.  As of May 22,

                                     -36-


2001, there were 2,425 shares of Series D preferred stock outstanding
convertible into 1,121,386 shares of common stock.

     No other shares of preferred stock are outstanding, and we have no present
plans to issue any additional shares of preferred stock.

Warrants and Other Obligations to Issue Capital Stock

     As of July 31, 2001, we had outstanding warrants to purchase an aggregate
of 883,649 shares of our common stock. These warrants have a weighted average
exercise price of $10.99 per share. These warrants expire between 2002 and 2008.
In connection with the acquisition of PolaRx Biopharmaceuticals in January 2000,
we issued 5,000,000 shares of our common stock. Two additional payouts tied to
sales thresholds of $10 million and $20 million in any four consecutive quarters
may be payable in tranches of $4 million and $5 million at the then fair market
value of our stock, at the time such thresholds are achieved. We are also
obligated to make additional payouts based on annualized sales of TRISENOX,
which payouts can be made in common stock or cash, at our election.

Antitakeover Effects of Provisions of Washington Law and Our Charter and Bylaws

  Statutory and Charter Provisions

     Washington law contains certain provisions that may have the effect of
delaying, deterring or preventing a change in control of the company.  Chapter
23B.17 of the Washington Business Corporation Act (the "WBCA") prohibits,
subject to certain exceptions, a merger, sale of assets or liquidation of the
company involving an "interested shareholder" (defined as a person or group of
affiliated persons who own beneficially 20% or more of the company's voting
securities) unless the transaction is determined to be at a "fair price" or
otherwise approved by a majority of the company's disinterested directors or is
approved by holders of two-thirds of the company's outstanding voting
securities, other than those held by the interested shareholder. A Washington
corporation may, in its articles of incorporation, exempt itself from coverage
of this provision, but we have not done so.  In addition, Chapter 23B.19 of the
WBCA prohibits the company, with certain exceptions, from engaging in certain
significant business transactions with an "acquiring person" (defined as a
person or group of persons who acquire 10% or more of the company's voting
securities without the prior approval of the Company's board of directors) for a
period of five years following the acquiring person's share acquisition date.
The prohibited transactions include, among others, a merger or consolidation
with, disposition of assets to, or issuance or redemption of stock to or from,
the acquiring person, or otherwise allowing the acquiring person to receive any
disproportionate benefit as a shareholder.  We may not exempt ourselves from
coverage of this statute.  These statutory provisions may have the effect of
delaying, deterring or preventing a change in control of the company.

     Our board of directors is divided into three approximately equal classes of
directors serving staggered three-year terms. In addition, our Restated Articles
of Incorporation provide that directors may be removed from office only at a
meeting of shareholders called expressly for that purpose and only for cause.
Our Restated Articles of Incorporation limit "cause" to willful misfeasance
having a material adverse effect on the company or conviction of a felony,
provided that any action by a director shall not constitute "cause" if, in good
faith, the director believed the action to be in or not opposed to the best
interests of the company or if the director is entitled to be indemnified with
respect to such action under applicable law, our Restated Articles of
Incorporation or Bylaws, or a contract with the company. Further, our Bylaws
require a shareholder to provide notice to the company of such shareholder's
intent to nominate a person or persons for election as directors not later than
90 days prior to the date one year from the date of the immediately preceding
annual meeting of shareholders or, in the case of an election to be held at a
special meeting of shareholders for the election of directors, the close of
business on the tenth day following the date on which notice of such meeting is
first given to shareholders. A shareholder must also provide us with notice of
such

                                     -37-


shareholder's intent to make any proposal at an annual meeting of shareholders
not later than 90 days prior to the date of one year from the date of the
immediately preceding annual meeting of shareholders. These provisions may have
the effect of deterring hostile takeovers or delaying changes in control or
management of our company.

Shareholder Rights Plan

     On November 11, 1996, our board of directors adopted a shareholder rights
plan and declared a distribution of one Preferred Stock Purchase Right (a Right)
for each outstanding share of common stock to shareholders of record as of the
close of business November 21, 1996 and for each share of common stock issued
thereafter pursuant to a Rights Agreement between the company and Computershare
Investor Services, LLC, as Rights Agent (the Rights Agreement). One Right will
be issued for each share of common stock issued in connection with this
offering. In connection with the adoption of the Rights Agreement, we reserved
for issuance 100,000 shares of Series C Preferred. The Series C Preferred will
only be issued in the event Rights issued pursuant to the Rights Agreement are
exercised.

Transfer Agent and Registrar

     The transfer agent and registrar for our common stock is Computershare
Investor Services, LLC.

                                     -38-


                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS

     The following is a summary of certain United States federal income tax
considerations relating to the purchase, ownership and disposition of the notes
and of common stock into which the notes may be converted, but does not purport
to be a complete analysis of all the potential tax considerations relating
thereto. This summary is based on laws, regulations, rulings and decisions now
in effect, all of which are subject to change. Unless otherwise indicated, this
summary generally applies to holders that will hold the notes as "capital
assets" within the meaning of Section 1221 of the Internal Revenue Code of 1986,
as amended (the "Code"). This summary does not address tax considerations
applicable to investors that may be subject to special tax rules, such as banks,
tax-exempt organizations, insurance companies, dealers in securities or
currencies, persons that will hold notes as a position in a hedging transaction,
"straddle" or "conversion transaction" for tax purposes or persons deemed to
sell notes under the constructive sale provisions of the Code.

     For purposes of this summary, the term "U.S. Holder" means a holder that
is, as determined for United States federal income tax purposes, either (1) a
citizen or resident of the United States, or U.S.; (2) an entity formed under
the laws of the U.S. or a state of the U.S.; (3) an estate the income of which
is subject to U.S. federal income tax regardless of its source; or (4) a trust
subject to the primary supervision of a court within the U.S. and the control of
a U.S. fiduciary as described in Section 7701 (a) (30). A "Non-U.S. Holder" is
any holder other than a U.S. Holder.

     CTI has not sought any ruling from the Internal Revenue Service with
respect to the statements made and the conclusions reached in the following
summary, and there can be no assurance that the IRS will agree with such
statements and conclusions.  In addition, the IRS is not precluded from
successfully adopting a contrary position.  This summary does not consider the
effect of any applicable foreign, state, local or other tax laws or the effect
of federal estate and gift tax law.

     Holders of notes should consult their own tax advisors with respect to the
application of the United States federal income and estate and gift tax laws to
their particular situations as well as any tax consequences arising under the
laws of any state, local or foreign taxing jurisdiction or under any applicable
tax treaty.

U.S. Holders

  Taxation of Interest

     Interest paid on the notes will be included in the income of a U.S. Holder
as ordinary income at the time it is treated as received or accrued, in
accordance with the holder's regular method of tax accounting.

     Failure of CTI to maintain the effectiveness of the registration statement
will cause additional interest to accrue on the notes in the manner described
under "Description of the Notes--Registration Rights." According to Treasury
Regulations, the possibility of a change in the interest rate due to CTI's
obligation to pay Liquidated Damages (see "Description of the Notes--
Registration Rights") will not affect the amount of interest income recognized
by a holder, or the timing of such recognition, if the likelihood of the change,
as of the date the notes are issued, is remote. CTI believes that the likelihood
of a change in the interest rate on the notes is remote and does not intend to
treat the possibility of a change in the interest rate as affecting the yield to
maturity of any note. Similarly, CTI intends to take the position that the
occurrence of an event requiring it to repurchase the notes or the exercise of
the redemption right after a certain date is remote under the Treasury
Regulations, and likewise does not intend to treat the possibility of the
occurrence of an event requiring it to repurchase the notes as affecting the
yield to maturity of any note.

                                     -39-


  Market Discount

     U.S. holder that purchases a note with "market discount" - that is, at a
price that is less than the principal amount - will be subject to special rules.
Under a de minimis exception, however, these special rules will not apply if the
amount of market discount does not exceed one quarter of one percent for each
full year remaining until the maturity of the notes.  If the special rules
apply, any gain recognized by the holder upon a sale or other disposition of the
note will be treated as ordinary income rather than capital gain to the extent
of that portion of the market discount that accrued prior to the disposition.
Market discount generally accrues on a straight line basis over the remaining
term of the note, but the holder can elect to compute accrued market discount
based on the economic yield of the note.  The holder of a note with market
discount might be required to recognize gain to the extent of accrued market
discount even if the disposition takes a form (such as a gift) in which the
holder would not normally be required to recognize gain.  The market discount
rules will not affect the tax consequences to the holder upon conversion of the
note, which will generally be tax-free under the rules described under
Conversion of the Notes.  The market discount that accrued prior to conversion,
however, will be carried over to the stock received on conversion, so that, to
that extent, any gain recognized by the holder upon disposition of the stock
will be treated as ordinary income.  Finally, if the holder's purchase of the
notes is debt-financed, the holder will not be entitled to deduct interest
expense allocable to accrued market discount until the holder recognizes the
corresponding income.  The holder of a note with market discount may elect to
include the market discount in income as it accrues.  If a holder makes this
election, any gain recognized on a disposition of the note would be entirely
capital gain, and the rules deferring the deduction of interest on related loans
would not apply.

  Market or Acquisition Premium

     If a U.S. holder purchases a note at a price that exceeds the principal
amount plus accrued interest, the holder can elect to amortize the premium as a
reduction to interest income so that the income reported by the holder each
period reflects the holder's economic yield.  Any premium paid on acquiring a
note is not amortizable, however, to the extent that it reflects the value of
the conversion privilege of the note.  If the holder elects to amortize premium,
the amortized premium would reduce the holder's tax basis in the note.  Further,
an election to amortize market or acquisition premium will apply to all market
premium bonds acquired during or after the year for which the election is made.
Such election may be terminated only with the consent of the Internal Revenue
Service.

  Sale, Exchange or Redemption of the Notes

     Upon the sale, exchange (other than conversion), retirement or other
taxable disposition of a note, a holder will recognize gain or loss equal to the
difference between the amount received on such disposition (other than amounts
received in respect of accrued and unpaid interest, which will be taxable as
such) and the holder's tax basis in the note.  A holder's tax basis in a note
will be, in general, the cost of the note to the holder, increased by any
accrued market discount and decreased by any principal payments received and any
amortizable market premium accrued.  Except to the extent of any accrued market
discount, gain or loss realized on the sale, exchange or retirement of a note
generally will be capital gain or loss, and will be long-term capital gain or
loss if, at the time of such sale, exchange or retirement, the note had been
held for more than one year.  Long-term capital gain recognized by an individual
holder is generally subject to a maximum U.S. federal rate of 20%, and short
term capital gains are taxed at a maximum rate of 38.6% (due to decrease in
years after 2001); an individual's ability to offset capital losses against
ordinary income is, however, limited.  Corporate taxpayers pay a maximum regular
tax rate of 35% on all capital gains and ordinary income.

                                     -40-


  Conversion of the Notes

     A holder will generally not recognize income, gain or loss upon conversion
of the note into our common stock, except with respect to any cash received in
lieu of a fractional share (which will generally result in capital gain or
loss).  The holder's tax basis in the common stock received upon conversion will
be the same as the holder's tax basis in the note at the time of conversion
(exclusive of any tax basis allocable to a fractional share), and the holding
period for the common stock received upon conversion will include the holding
period of the note converted.

  Dividends on Common Stock

     If, after conversion of the notes into common stock, we make a distribution
in respect of that stock, the distribution will be treated as a dividend,
taxable to the U.S. Holder as ordinary income, to the extent it is paid from our
current or accumulated earnings and profits.  If the distribution exceeds our
current and accumulated earnings and profits, the excess will be treated first
as a tax-free return of the holder's investment, up to the holder's basis in
such common stock and thereafter proceeds from the sale or exchange of a capital
asset treated as a capital gain.  If the holder is a U.S. corporation, it would
generally be able to claim a "dividend received deduction" under Section 243 of
the Code.

  Constructive Dividends on the Notes

     Holders of convertible debt instruments such as the notes may, in certain
circumstances, be deemed to have received constructive distributions where the
conversion ratio of such instruments is adjusted. Adjustments to the conversion
price made pursuant to a bona fide reasonable adjustment formula which has the
effect of preventing the dilution of the interest of the holders of the debt
instruments, however, will generally not be considered to result in a
constructive distribution of stock. Certain of the possible adjustments provided
in the notes, including, without limitations, adjustments in respect of taxable
dividends to stockholders of CTI, will not qualify as being pursuant to a bona
fide reasonable adjustment formula. If such adjustments are made, the holders of
notes might be deemed to have received constructive distributions taxable as
dividends. Moreover, in certain other circumstances, the failure to adjust the
conversion ratio on the notes may result in a deemed taxable dividend to holders
of our common stock.

  Sale of Common Stock

     Except to the extent of any accrued market discount, upon the sale or
exchange of our common stock, a holder generally will recognize capital gain or
loss equal to the difference between (1) the amount of cash and the fair market
value of any property received upon the sale or exchange and (2) such holder's
adjusted tax basis in our common stock.  Such capital gain or loss will be long-
term capital gain or loss if the holder's holding period in our common stock is
more than one year at the time of the sale or exchange.  Any accrued market
discount would be taxable as ordinary income.  A holder's basis and holding
period in our common stock received upon conversion of a note are determined as
discussed above under "--Conversion of the Notes."

  Information Reporting and Backup Withholding Tax

     In general, information reporting requirements will apply to payments of
principal, premium, if any, and interest on a note, payments of dividends on our
common stock, payments of the proceeds of the sale of a note and payments of the
proceeds of the sale of our common stock, and a 30.5% (reduced to 30% after
December 31, 2001) backup withholding tax may apply to such payments if the
holder either (1) fails to demonstrate that the holder comes within certain
exempt categories of holders or (2) fails to furnish or certify his correct
taxpayer identification number to the payor in the manner required, is notified
by the IRS that he has failed to report payments of interest and dividends
properly, or under certain circumstances, fails to

                                     -41-


certify that he has not been notified by the IRS that he is subject to backup
withholding for failure to report interest and dividend payments. Any amounts
withheld under the backup withholding rules from a payment to a holder will be
allowed as a credit against such holder's United States federal income tax and
may entitle the holder to a refund, provided that the required information is
furnished to the IRS.

Non-U.S. Holders

     The following discussion is limited to the U.S. federal income tax
consequences relevant to a Non-U.S. Holder (as defined above).

     For purposes of withholding tax on interest and dividends discussed below,
a Non-U.S. Holder includes a non-resident fiduciary of an estate or trust.  For
purposes of the following discussion, interest, dividends and gain on the sale,
exchange or other disposition of a note or common stock will be considered to be
"U.S. trade or business income" if such income or gain is (1) effectively
connected with the conduct of a U.S. trade or business or (2) in the case of a
treaty resident, attributable to a permanent establishment (or, in the case of
an individual, a fixed base) in the United States.

  Taxation of Interest

     Generally any interest paid to a Non-U.S. Holder of a note that is not U.S.
trade or business income will not be subject to U.S. tax if the interest
qualifies as "portfolio interest."  Generally interest on the notes will qualify
as portfolio interest if (1) the Non-U.S. Holder does not actually or
constructively own 10% or more of the total voting power of all CTI voting stock
and is not a "controlled foreign corporation" with respect to which CTI is a
"related person" within the meaning of the Code, (2) the beneficial owner, under
penalty of perjury, certifies that the beneficial owner is not a U.S. person and
such certificate provides the beneficial owner's name and address, and (3) the
Non-U.S. Holder is not a bank receiving interest on an extension of credit made
pursuant to a loan agreement made in the ordinary course of its trade or
business.

     The gross amount of payments of interest to a Non-U.S. Holder that do not
qualify for the portfolio interest exemption and that are not U.S. trade or
business income will be subject to U.S. federal income tax at the rate of 30%
collected by means of withholding by the payor, unless a U.S. income tax treaty
applies to reduce or eliminate withholding.  U.S. trade or business income will
be taxed at regular U.S. rates rather than the 30% gross rate.  In the case of a
Non-U.S. Holder that is a corporation, such U.S. trade or business income may
also be subject to the branch profits tax (which is generally imposed on a
foreign corporation on the actual or deemed repatriation from the United States
of earnings and profits attributable to U.S. trade or business income) at a 30%
rate.  The branch profits tax may not apply (or may apply at a reduced rate) if
a recipient is a qualified resident of certain countries with which the United
States has an income tax treaty.  To claim the benefit of a tax treaty or to
claim exemption from withholding because the income is U.S. trade or business
income, the Non-U.S. Holder must provide a properly executed Form W-8 BEN or W-8
ECI (or such successor forms as the IRS designates), as applicable, prior to the
payment of interest.  These forms must be periodically updated.  Under current
Treasury regulations, a Non-U.S. Holder who is claiming the benefits of a treaty
may be required to obtain a U.S. taxpayer identification number, which may
require providing certain documentary evidence issued by foreign governmental
authorities to prove residence in the foreign country.  Certain special
procedures are provided in such regulations for payments through qualified
intermediaries.

  Sale, Exchange or Redemption of the Notes

     Except as described below and subject to the discussion concerning backup
withholding, any gain realized by a Non-U.S. Holder on the sale, exchange or
redemption of a note generally will not be subject to U.S. federal income tax,
unless (1) such gain is U.S. trade or business income, (2) subject to certain
exceptions, the Non-U.S. Holder is an individual who holds the note as a capital
asset and is present in the

                                     -42-


United States for 183 days or more in the taxable year of the disposition, (3)
the Non-U.S. Holder is subject to tax pursuant to the provisions of U.S. tax law
applicable to certain U.S. expatriates (including certain former citizens or
residents of the United States, or (4) in the case of the disposition of CTI
common stock, CTI is a U.S. real property holding corporation. CTI does not
believe that it is currently a "United States real property holding
corporation," or that it will become one in the future.

  Conversion of the Notes

     A Non-U.S. Holder generally will not be subject to U.S. federal income tax
on the conversion of notes into CTI common stock, except with respect to (i)
cash (if any) received in lieu of a fractional share or (ii) interest which does
not qualify for the portfolio interest exemption, is not U.S. trade or business
income and has not previously been included in income.  Cash received in lieu of
a fractional share may give rise to gain that would be subject to the rules
described above for the sale of notes.  Cash or common stock treated as issued
for accrued interest would be treated as interest under the rules described
above.

  Dividends

     Dividends paid to a Non-U.S. Holder on common stock received on conversion
of the notes will generally be subject to U.S. withholding tax at a rate of 30%.
The withholding tax might not apply, however, or might apply at a reduced rate,
under terms of a treaty between the United States and the Non-U.S. Holder's
country of residence.  A Non-U.S. Holder must demonstrate its entitlement to
treaty benefits by certifying its nonresident status.

  Sale of Common Stock

     Non-U.S. Holders will generally not be subject to U.S. federal income tax
or any gains realized on the sale, exchange, or other disposition of common
stock received upon conversion of the notes.  The general rule is subject to the
same exceptions described above under the heading "--Non-U.S. Holders--Sale,
Exchange or Redemption of the Notes."

  Information Reporting and Backup Withholding Tax

     CTI must report annually to the IRS and to each Non-U.S. Holder any
interest or dividend that is subject to withholding or is exempt from U.S.
withholding tax pursuant to a tax treaty, or interest that is exempt from U.S.
tax under the portfolio interest exception. Copies of these information returns
may also be made available under the provisions of a specific treaty or
agreement to the tax authorities of the country in which the Non-U.S. Holder
resides.

     Treasury Regulations provide that backup withholding and additional
information reporting will not apply to payments of principal on the notes by
CTI to a Non-U.S. Holder if the holder certifies as to its non-U.S. status under
penalties of perjury or otherwise establishes an exemption (provided that
neither CTI nor its paying agent has actual knowledge that the holder is a U.S.
person or that the conditions of any other exemption are not, in fact,
satisfied). As a general matter, information reporting and backup withholding
will not apply to a payment of the proceeds of a sale of notes or common stock
effected outside the United States by a foreign office of a foreign broker.
However, information reporting requirements (but not backup withholding) will
apply to a payment of the proceeds of a sale of notes or common stock effected
outside the United States by a foreign office of a broker if the broker (1) is a
U.S. person, (2) derives 50 percent or more of its gross income for certain
periods from the conduct of a trade or business in the United States, (3) is a
"controlled foreign corporation" as to the United States, or (4) with respect to
payments after December 31, 2000, is a foreign partnership that, at any time
during its taxable year is 50 percent or more (by income or capital interest)
owned by U.S. persons or is engaged in the conduct of a U.S. trade or business
unless the broker has documentary evidence in its records that the holder is a
Non-U.S. Holder and certain conditions are

                                     -43-


met, or the holder otherwise establishes an exemption. Payment by a United
States office of a broker of the proceeds of a sale of notes or common stock
will be subject to both backup withholding and information reporting unless the
holder certifies its non-U.S. status under penalties of perjury or otherwise
establishes an exemption.

     New Treasury regulations, generally effective with respect to payments made
after December 31, 2000, make certain modifications to the withholding, backup
withholding and information reporting rules described above.  The new
regulations generally attempt to unify certification requirements and modify
reliance standards.  Prospective investors are urged to consult their own tax
advisors regarding the new regulations.

     Any amounts withheld under the backup withholding rules from a payment to a
Non-U.S. Holder will be allowed as a refund or a credit against such Non-U.S.
Holder's U.S. federal income tax liability, provided that the requisite
procedures are followed.

                                     -44-


                            SELLING SECURITYHOLDERS

     We originally issued the notes in a private placement in June 2001.  The
notes were resold by the initial purchasers to qualified institutional buyers
under Rule 144A under the Securities Act in transactions exempt from
registration under the Securities Act.  Selling securityholders may offer and
sell the notes and the underlying common stock pursuant to this prospectus.

     The following table contains information as of August 17, 2001, with
respect to the selling securityholders and the principal amount of notes and the
underlying common stock beneficially owned by each selling securityholders that
may be offered using this prospectus.



                                               Principal Amount
                                               at Maturity of                                  Number of Shares
                                               Notes Beneficially                              of Common Stock       Percentage of
                                               Owned That may        Percentage of             That may be           Common Stock
Name                                           be Sold               Notes Outstanding         Sold(1)               Outstanding(2)
- -------------------------------------------    ------------------    -----------------         ----------------      --------------
                                                                                                         
Alexandra Global Investment Fund I, Ltd....        $ 3,500,000             2.3                     102,941                 *
Allstate Life Insurance Company............        $   300,000               *                       8,823                 *
Allstate Insurance Company.................        $ 1,200,000               *                      35,294                 *
Argonaut Partnership, LP...................        $   900,000               *                      26,470                 *
Argonaut Investment Fund Ltd...............        $   150,000               *                       4,411                 *
Quota Rabbico II, Ltd......................        $ 3,950,000             2.6                     116,176                 *
BNP Cooper Nef Convertible Strategies
Fund, LP...................................        $ 3,059,000             2.0                      89,970                 *
BNP Paribas Equity Strategies, SNC.........        $15,941,000            10.6                     468,852               1.4
Duquesne Fund, L.P.........................        $ 2,080,000             1.4                      61,176                 *
Steeler Fund, Ltd..........................        $ 7,370,000             4.9                     216,764                 *
NO Margin Fund, L.P........................        $   550,000               *                      16,176                 *
Fidelity Advisor Series VII: Fidelity
Advisor Biotechnology Fund.................        $   160,000               *                       4,411                 *
Fidelity Select Portfolios:
Biotechnology Portfolio....................        $15,000,000            10.0                     441,176               1.3
Fidelity Financial Trust: Fidelity
Convertible Securities Fund................        $ 4,000,000             2.7                     117,647                 *
First Union International Capital
Markets....................................        $ 5,000,000             3.3                     147,058                 *
First Union National Bank..................        $ 9,000,000             6.0                     264,705                 *
Guardian Life Insurance Co.................        $ 9,300,000             6.2                     273,529                 *
Guardian Pension Trust.....................        $   500,000               *                      14,705                 *
Family Service Life Insurance Co...........        $   200,000               *                       5,882                 *
Coastal Convertibles Ltd...................        $ 1,000,000               *                      29,411                 *
Highbridge International LLC...............        $ 5,000,000             3.3                     147,058                 *
JMG Capital Partners, LP...................        $ 2,000,000             1.3                      58,823                 *
JMG Triton Offshore Fund, Ltd..............        $ 2,000,000             1.3                      58,823                 *
Lipper Convertibles, L.P...................        $ 3,000,000             2.0                      88,235                 *
Lipper Convertibles, L.P. (Class B)........        $   500,000               *                      14,705                 *
Lipper Offshore Convertibles, L.P..........        $ 1,000,000               *                      29,411                 *
Lipper Convertibles Series II, L.P.........        $   500,000               *                      14,705                 *
Lord, Abbett Bond Debenture Fund...........        $ 7,000,000             4.7                     205,882                 *
National Fuel Gas Company Retirement
Plan.......................................        $    50,000               *                       1,470                 *
American Skandia Trust.....................        $   100,000               *                       2,941                 *
B.C. McCabe Foundation.....................        $   100,000               *                       2,941                 *
Oxford, Lord Abbett & Co...................        $   500,000               *                      14,705                 *


                                     -45-




                                               Principal Amount
                                               at Maturity of                                  Number of Shares
                                               Notes Beneficially                              of Common Stock       Percentage of
                                               Owned That may        Percentage of             That may be           Common Stock
Name                                           be Sold               Notes Outstanding         Sold(1)               Outstanding(2)
- -------------------------------------------    ------------------    -----------------         ----------------      --------------
                                                                                                         
Fuji U.S. Income Open......................        $   750,000               *                       22,058                *
Met Investors Bond Debenture Fund..........        $   750,000               *                       22,058                *
Mainstay VP Convertible Portfolio..........        $   900,000               *                       26,470                *
Mainstay Convertible Fund..................        $ 3,400,000             2.3                      100,000                *
New York Life Separate Account #7..........        $   460,000               *                       13,529                *
AFTRA Health Fund..........................        $   240,000               *                        7,058                *
Morgan Stanley Dean Witter Convertible
Securities Trust Fund......................        $ 1,500,000             1.0                       44,117                *
Quattro Fund, Ltd..........................        $ 3,500,000             2.3                      102,941                *
TQA Master Fund, Ltd.......................        $ 2,500,000             1.7                       73,529                *
TQA Master Plus Fund, Ltd..................        $ 2,500,000             1.7                       73,529                *
Tribeca Investments, L.L.C.................        $ 5,000,000             3.3                      147,058                *
UBS O'Connor LLC f/b/o UBS Global Equity
Arbitrage Master Ltd.......................        $ 3,000,000             2.0                       88,235                *
Zazove Hedged Convertible Fund, L.P........        $   660,000               *                       19,411                *
Zazove Institutional Benchmarks Master
Fund Ltd...................................        $   340,000               *                       10,000                *
AAM/Zazove Institutional Income Fund, L.P..        $   400,000               *                       11,764                *
San Diego County Employees Retirement
Association................................        $   600,000               *                       17,647                *
Deutsche Banc Alex Brown Inc...............        $15,000,000            10.0                      441,176                *
Others.....................................        $ 3,590,000             2.4                      105,589                *


______________________
* Less than 1%.
(1)  Assumes conversion of all of the holder's notes at a conversion price of
     approximately $34.00 per share of common stock.  However, this conversion
     price will be subject to adjustment as described under "Description of
     Notes--Conversion Rights."  As a result, the amount of common stock
     issuable upon conversion of the notes may increase or decrease in the
     future.

(2)  Calculated based on Rule 13d-3(d)(1)(i) of the Exchange Act using
     33,715,053 shares of common stock outstanding as of July 31, 2001.  In
     calculating this amount, we treated as outstanding the number of shares of
     common stock issuable upon conversion of all of that particular holder's
     notes.  However, we did not assume the conversion of any other holder's
     notes.

(3)  Information about other selling security holders will be set forth in
     prospectus supplements, if required.

(4)  Assumes that any other holders of notes, or any future transferees,
     pledgees, donees or successors of or from any such other holders of notes,
     do not beneficially own any common stock other than the common stock
     issuable upon conversion of the notes at the initial conversion rate.

       We prepared this table based on the information supplied to us by the
selling securityholders named in the table.

       The selling securityholders listed in the above table may have sold or
transferred, in transactions exempt from the registration requirements of the
Securities Act, some or all of their notes since the date on which the
information in the above table is presented.  Information about the selling
securityholders may change from over time.  Any changed information will be set
forth in prospectus supplements.

       Because the selling securityholders may offer all or some of their notes
or the underlying common stock from time to time, we cannot estimate the amount
of the notes or underlying common stock that will be held by the selling
securityholders upon the termination of any particular offering. See "Plan of
Distribution."

                                     -46-


                             PLAN OF DISTRIBUTION

     We will not receive any of the proceeds of the sale of the notes and the
underlying common stock offered by this prospectus. The notes and the underlying
common stock may be sold from time to time to purchasers:

     .    directly by the selling securityholders;

     .    through underwriters, broker-dealers or agents who may receive
          compensation in the form of discounts, concessions or commissions from
          the selling securityholders or the purchasers of the notes and the
          underlying common stock.

     The selling securityholders and any such broker-dealers or agents who
participate in the distribution of the notes and the underlying common stock may
be deemed to be "underwriters." As a result, any profits on the sale of the
notes and underlying common stock by selling securityholders and any discounts,
commissions or concessions received by any such broker-dealers or agents might
be deemed to be underwriting discounts and commissions under the Securities Act.
If the selling securityholders were to be deemed underwriters, the selling
securityholders may be subject to certain statutory liabilities of, including,
but not limited to, Sections 11, 12 and 17 of the Securities Act and Rule 10b-5
under the Exchange Act.

     If the notes and underlying common stock are sold through underwriters or
broker-dealers, the selling securityholders will be responsible for underwriting
discounts or commissions or agent's commissions.

     The notes and underlying common stock may be sold in one or more
transactions at:

     .    fixed prices

     .    prevailing market prices at the time of sale

     .    varying prices determined at the time of sale, or

     .    negotiated prices.

     These sales may be effected in transactions:

     .    on any national securities exchange or quotation service on which the
          notes and underlying common stock may be listed or quoted at the time
          of the sale, including the Nasdaq National Market System in the case
          of the common stock

     .    in the over-the-counter market

     .    in transactions otherwise than on such exchanges or services or in the
          over-the-counter market, or

     .    through the writing of options.

     These transactions may include block transactions or crosses. Crosses are
transactions in which the same broker acts as an agent on both sides of the
trade.

     In connection with sales of the notes and underlying common stock or
otherwise, the selling securityholders may enter into hedging transactions with
broker-dealers. These broker-dealers may in turn engage in short sales of the
notes and underlying common stock in the course of hedging their positions. The
selling securityholders may also sell the notes and underlying common stock
short and deliver notes and

                                     -47-


underlying common stock to close out short positions, or loan or pledge notes
and underlying common stock to broker-dealers that in turn may sell the notes
and underlying common stock.

     To our knowledge, there are currently no plans, arrangement or
understandings between any selling securityholders and any underwriter, broker-
dealer or agent regarding the sale of the notes and the underlying common stock
by the selling securityholders.  Selling securityholders may not sell any or all
of the notes and the underlying common stock offered by them pursuant to this
prospectus.  In addition, we cannot assure you that any such selling
securityholder will not transfer, devise or gift the notes and the underlying
common stock by other means not described in this prospectus.

     Our common stock trades on the Nasdaq National Market under the symbol
"CTIC."  We cannot assure you as to the development of liquidity or any trading
market for the notes.  See "Risk Factors--There is no public market for the
notes being offered and restrictions on transfer of the notes and the common
stock issuable upon conversion of the notes may significantly impair the
liquidity of the notes."

     There can be no assurance that any selling securityholder will sell any or
all of the notes or underlying common stock pursuant to this prospectus.  In
addition, any notes or underlying common stock covered by this prospectus that
qualify for sale pursuant to Rule 144 or Rule 144A of the Securities Act may be
sold under Rule 144 or Rule 144A rather than pursuant to this prospectus.

     The selling securityholders and any other person participating in such
distribution will be subject to the Exchange Act.  The Exchange Act rules
include, without limitation, Regulation M, which may limit the timing of
purchases and sales of any of the notes and the underlying common stock by the
selling securityholders and any other such person.  In addition, Regulation M of
the Exchange Act may restrict the ability of any person engaged in the
distribution of the notes and the underlying common stock to engage in market-
making activities with respect to the particular notes and the underlying common
stock being distributed for a period of up to five business days prior to the
commencement of such distribution.  This may affect the marketability of the
notes and the underlying common stock and the ability of any person or entity to
engage in market-making activities with respect to the notes and the underlying
common stock.

     Pursuant to the registration rights agreement filed as an exhibit to this
registration statement, we and the selling securityholders will be indemnified
by the other against certain liabilities, including certain liabilities under
the Securities Act or will be entitled to contribution in connection with these
liabilities.

     We have agreed to pay substantially all of the expenses incidental to the
registration, offering and sale of the notes and underlying common stock to the
public other than commissions, fees and discounts of underwriters, brokers,
dealers and agents.

                                 LEGAL MATTERS

     The validity of the issuance of the Cell Therapeutics, Inc. securities
offered by this prospectus will be passed upon for Cell Therapeutics, Inc. by
Wilson Sonsini Goodrich & Rosati, Professional Corporation, San Francisco,
California.

                                    EXPERTS

     Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements and schedule included in our Annual Report on Form 10-K/A
for the year ended December 31, 2000, as set forth in their report, which is
incorporated by reference in this prospectus and elsewhere in the registration
statement.  Our financial statements and schedule are incorporated by reference
in reliance on Ernst & Young LLP's report, given on their authority as experts
in accounting and auditing.

                                     -48-


                                    PART II

                  INFORMATION NOT REQUIRED IN THE PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

     The aggregate estimated (other than the registration fee) expenses to be
paid by the Registrant in connection with this offering are as follows:

     
                                                                     
     Securities and Exchange Commission registration fee..........      $ 37,500
     Trustee's fees and expenses..................................        10,000
     Accounting fees and expenses.................................        60,000
     Legal fees and expenses......................................        50,000
     Miscellaneous................................................         2,500
                                                                  ------------------
Total                                                                   $160,000
                                                                  ===================


Item 15.  Indemnification of Directors and Officers of Cell Therapeutics

     Section 145 of the Delaware General Corporation Law authorizes a court to
award, or a corporation's Board of Directors to grant, indemnity to directors
and officers in terms sufficiently broad to permit such indemnification under
certain circumstances for liabilities (including reimbursement for expenses
incurred) arising under the Securities Act of 1933.  Article X, Section 1 of the
Registrant's Bylaws provides for indemnification of its directors and officers
to the maximum extent permitted by law.

Item 16.  Exhibits

The following exhibits are filed herewith or incorporated by reference herein:




     Exhibit
     Number           Exhibit Title
     ------           ---------------------------------------------------------------------------------------------------
                   
     3.1 (1)          Registrant's Restated Articles of Incorporation.
     3.2 (1)          Registrant's Articles of Amendment to Restated Articles of Incorporation Establishing a Series of
                      Preferred Stock (Series A Convertible Preferred Stock).
     3.3 (2)          Registrant's Articles of Amendment to Restated Articles of Incorporation Reducing the Number of
                      Authorized Shares of Series A Convertible Preferred Stock.
     3.4 (2)          Registrant's Articles of Amendment to Restated Articles of Incorporation Establishing a Series of
                      Preferred Stock (Series B Convertible Preferred Stock).
     3.5 (2)          Registrant's Articles of Amendment to Restated Articles of Incorporation Establishing a Series of
                      Preferred Stock (Series C Convertible Preferred Stock).
     3.6 (2)          Registrant's Articles of Amendment to Restated Articles of Incorporation of Cell Therapeutics,
                      Inc. Effecting a Reverse Stock Split.
     3.7 (3)          Registrant's Articles of Amendment to Restated Articles of Incorporation of Undesignating Series
                      A and Series B Preferred Stock.
     3.7 (4)          Registrant's Restated Bylaws.
     4.1 (5)          Indenture, dated as of June 13, 2001, between CTI and State Street Bank and Trust Company of
                      California, N.A.
     5.1              Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
     


                                      II-1




     Exhibit
     Number         Exhibit Title
     ------         --------------------------------------------------------------------------------------------------
                 
     10.1(5)        Registration Rights Agreement, dated as of June 13, 2001, between CTI and the Initial Purchasers
                    set forth therein.
     12.1           Computation of Ratio of Earnings to Fixed Charges.
     23.1           Consent of Ernst & Young LLP, Independent Auditors.
     23.2           Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit 5.1).
     24.1           Power of Attorney of certain directors and officers of Cell Therapeutics, Inc. (included on page
                    II-4).
     25.1           Form T-1 Statement of Eligibility of Trustee for Indenture under the Trust Indenture Act of 1939.

     __________________
     (1)  Incorporated by reference to exhibits to the Registrant's Registration
          Statement on Form S-1 (No. 33-4154).
     (2)  Incorporated by reference to the Registrant's Registration Statement
          on Form S-1 (No. 333-20855).
     (3)  Incorporated by reference to the Registrant's Registration Statement
          on Form S-3 (No. 333-36603).
     (4)  Incorporated by reference to exhibits to the Registrant's Quarterly
          Report on Form 10-Q for the quarter ended September 30, 1996.
     (5)  Incorporated by reference to exhibits of the same number of the
          Registrant's Current Report on Form 8-K (File No. 0-28386) dated June
          13, 2001.

Item 17.     Undertakings

     The undersigned Registrant hereby undertakes:

     (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:

              (a)  To include any prospectus required by Section 10(a)(3) of the
Securities Act,

              (b)  To reflect in the prospectus any facts or events arising
after the effective date of the registration statement (or the most recent post-
effective amendment thereof) which, individually or in the aggregate, represent
a Fundamental Change in the information set forth in the Registration Statement.
Notwithstanding the foregoing, any increase or decrease in volume of securities
offered (if the total dollar value of securities offered would not exceed that
which was registered) and any deviation from the low or high end of the
estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20 percent change in the
maximum aggregate offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement,

              (c)  To include any material information with respect to the plan
of distribution not previously disclosed in the Registration Statement or any
material change to such information in the Registration Statement;

      provided, however, that clauses (a) and (b) do not apply if the
information required to be included in a post-effective amendment by such
clauses is contained in periodic reports filed with or furnished to the
Securities and Exchange Commission by the Registrant pursuant to Section 13 or
Section 15(d) of the Securities Exchange Act of 1934 (the "Exchange Act") that
are incorporated by reference in the Registration Statement.

                                      II-2


     (2)  That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (4)  That, for purposes of determining any liability under the Securities
Act, each filing of the Registrant's annual report pursuant to Section 13(a) or
Section 15(d) of the Exchange Act that is incorporated by reference in this
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions described under Item 15 above, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable.  In the event
that a claim for indemnification against such liabilities, other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding, is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.

     The undersigned Registrant hereby undertakes that:

     (1) For purposes of determining any liability under the Securities Act of
         1933, the information omitted from the form of prospectus filed as part
         of this registration statement in reliance upon Rule 430A and contained
         in a form of prospectus filed by the registrant pursuant to Rule
         424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to
         be part of this registration statement as of the time it was declared
         effective.

     (2) For the purpose of determining any liability under the Securities Act
         of 1933, each post-effective amendment that contains a form of
         prospectus shall be deemed to be a new registration statement relating
         to the securities offered therein, and the offering of such securities
         at that time shall be deemed to be the initial bona fide offering
         thereof.

                                      II-3


                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3, and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Seattle, State of Washington on August 17, 2001.

                                  CELL THERAPEUTICS, INC.


                                  By:  /s/ James A. Bianco
                                      ---------------------------------
                                       James A. Bianco, M.D.
                                       President and Chief Executive Officer

                               POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned officers and directors of Cell Therapeutics, Inc., a
Washington corporation, do hereby constitute and appoint James A. Bianco, M.D.
and Louis A. Bianco and each of them, the lawful attorneys-in-fact and agents,
each with full power of substitution or resubstitution, with full power and
authority to do any and all acts and things and to execute any and all
instruments which said attorneys and agents, or either one of them, determine
may be necessary or advisable or required to enable said corporation to comply
with the Securities Act of 1933, as amended, and any rules or regulation or
requirements of the Securities and Exchange Commission in connection with this
Registration Statement. Without limiting the generality of the foregoing power
and authority, the powers granted include the power and authority to sign the
names of the undersigned officers and directors in the capacities indicated
below to this Registration Statement, to any and all amendments, both pre-
effective and post-effective, and supplements to this Registration Statement and
to any and all instruments or documents filed as part of or in conjunction with
this Registration Statement or amendments or supplements thereto, and each of
the undersigned hereby ratifies and confirms all that said attorneys and agents,
or either one of them, shall do or cause to be done by virtue hereof. This Power
of Attorney may be signed in several counterparts.

                                      II-4


     IN WITNESS WHEREOF, each of the undersigned has executed this Power of
Attorney as of the date indicated.

     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated.




Signatures                                  Title                              Date
- -------------                       ----------------------                ---------------
                                                                    
 /s/ Max E. Link                    Chairman of the Board                 August 17, 2001
- ----------------------------------
Max E. Link, Ph.D.

 /s/ James A. Bianco                President, Chief Executive Officer    August 17, 2001
- ----------------------------------  and Director
James A. Bianco, M.D.

 /s/ Louis A. Bianco                Executive Vice President, Finance     August 17, 2001
- ----------------------------------  and Administration
Louis A. Bianco

 /s/ Jack W. Singer                 Director                              August 17, 2001
- ----------------------------------
Jack W. Singer, M.D.

 /s/ Jack L. Bowman                 Director                              August 17, 2001
- ----------------------------------
Jack L. Bowman

                                    Director                              August 17, 2001
- ----------------------------------
Wilfred E. Jaeger, M.D.

 /s/ Mary O'Neil Mundinger          Director                              August 17, 2001
- ----------------------------------
Mary O'Neil Mundinger, DrPH.

 /s/ Phillip M. Nudelman            Director                              August 17, 2001
- ----------------------------------
Phillip M. Nudelman, Ph.D.


                                      II-5




     Exhibit
     Number       Exhibit Title
     ------       --------------------------------------------------------------------------------------------------
              
     3.1 (1)      Registrant's Restated Articles of Incorporation.
     3.2 (1)      Registrant's Articles of Amendment to Restated Articles of Incorporation Establishing a Series of
                  Preferred Stock (Series A Convertible Preferred Stock).
     3.3 (2)      Registrant's Articles of Amendment to Restated Articles of Incorporation Reducing the Number of
                  Authorized Shares of Series A Convertible Preferred Stock.
     3.4 (2)      Registrant's Articles of Amendment to Restated Articles of Incorporation Establishing a Series of
                  Preferred Stock (Series B Convertible Preferred Stock).
     3.5 (2)      Registrant's Articles of Amendment to Restated Articles of Incorporation Establishing a Series of
                  Preferred Stock (Series C Convertible Preferred Stock).
     3.6 (2)      Registrant's Articles of Amendment to Restated Articles of Incorporation of Cell Therapeutics,
                  Inc. Effecting a Reverse Stock Split.
     3.7 (3)      Registrant's Articles of Amendment to Restated Articles of Incorporation of Undesignating Series
                  A and Series B Preferred Stock.
     3.7 (4)      Registrant's Restated Bylaws.
     4.1 (5)      Indenture, dated as of June 13, 2001, between CTI and State Street Bank and Trust Company of
                  California, N.A.
     5.1          Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
     10.1(5)      Registration Rights Agreement, dated as of June 13, 2001, between CTI and the Initial Purchasers
                  set forth therein.
     12.1         Computation of Ratio of Earnings to Fixed Charges.
     23.1         Consent of Ernst & Young LLP, Independent Auditors.
     23.2         Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit 5.1).
     24.1         Power of Attorney of certain directors and officers of Cell Therapeutics, Inc. (included on page
                  II-4).
     25.1         Form T-1 Statement of Eligibility of Trustee for Indenture under the Trust Indenture Act of 1939.

      _________________________
     (1)  Incorporated by reference to exhibits to the Registrant's Registration
          Statement on Form S-1 (No. 33-4154).
     (2)  Incorporated by reference to the Registrant's Registration Statement
          on Form S-1 (No. 333-20855).
     (3)  Incorporated by reference to the Registrant's Registration Statement
          on Form S-3 (No. 333-36603).
     (4)  Incorporated by reference to exhibits to the Registrant's Quarterly
          Report on Form 10-Q for the quarter ended September 30, 1996.
     (5)  Incorporated by reference to exhibits of the same number of the
          Registrant's Current Report on Form 8-K (File No. 0-28386) dated June
          13, 2001.

                                      II-6