<ins>10Q DOC</ins>


UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549




FORM 10-Q (Mark



     (Mark One)

[X] Quarterly report pursuant to SectionQUARTERLY REPORT PURSUANT TO SECTION 13 orOR 15(d) of the Securities Exchange Act ofOF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended September 30, 1999March 31, 2000

OR

 ] Transition report pursuant to SectionTRANSITION REPORT PURSUANT TO SECTION 13 orOR 15(d) ofOF THE SECURITIES EXCHANGE ACT OF 1934

For the Securities Exchange Act of 1934transition period from ________to _________

Commission File Number: file number    0-19756

PROTEIN DESIGN LABS, INC.
(Exact name of registrantRegistrant as specified in its charter) Delaware 94-3023969 (State or other jurisdiction of (I.R.S.Charter)

 
Delaware
94-3023969
  (State or Other Jurisdiction of Incorporation or Organization) 
(I.R.S. Employer incorporation or organization) Identification Number)

34801 Campus Drive
Fremont, Ca.California,    94555

(Address of principal executive offices)Principal Executive Offices including Zip Code)

(510) 574-1400
(Registrant's Telephone Number, (510) 574-1400Including Area Code)



Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d)15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days: Yesdays.    YES [X] No   NO ]

As of September 30, 1999,March 31, 2000, there were 18,723,11419,573,677 shares of the Registrant's Common Stock outstanding.







PROTEIN DESIGN LABS, INC. INDEX PART I. FINANCIAL INFORMATION ITEM 1. FINANCIAL STATEMENTS Condensed Consolidated Statements of Operations Three months ended September 30, 1999 and 1998 and Nine months ended September 30, 1999 and 1998 Condensed Consolidated Balance Sheets September 30, 1999 and December 31, 1998 Condensed Consolidated Statements of Cash Flows Nine months ended September 30, 1999 and 1998 Notes to Unaudited Financial Statements ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK PART II. OTHER INFORMATION ITEM 5. OTHER INFORMATION - RISK FACTORS ITEM 6. EXHIBITS AND REPORTS
QUARTERLY REPORT ON FORM 8-K Signatures PART I. FINANCIAL INFORMATION ITEM 1. FINANCIAL STATEMENTS10-Q FOR THE PERIOD ENDED MARCH 31, 2000
TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION Page No.
     
Item 1. Interim Consolidated Financial Statements (unaudited):
 
     
           Consolidated Statements of Operations for the
           three months ended March 31, 2000 and 1999
**
     
           Consolidated Balance Sheets at March 31, 2000 and December 31, 1999
**
     
           Consolidated Statements of Cash Flows for the
           three months ended March 31, 2000 and 1999
**
     
           Notes to Unaudited Consolidated Financial Statements
**
     
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
**
     
Item 3. Quantitative and Qualitative Disclosures About Market Risk
**
     
PART II. OTHER INFORMATION
 
     
Item 5. Other Information
**
     
Item 6. Exhibits and Reports on Form 8-K
**
     
Signatures
**







PROTEIN DESIGN LABS, INC. CONDENSED
CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except net income (loss) per share data)
(unaudited)
Three Months Ended Nine Months Ended September 30, September 30, --------------------- --------------------- 1999 1998 1999 1998 ---------- ---------- ---------- ---------- Revenues: Revenue under agreements with third parties $8,401 $9,610 $20,902 $17,274 Interest and other income 2,172 2,268 6,795 7,198 ---------- ---------- ---------- ---------- Total revenues 10,573 11,878 27,697 24,472 ---------- ---------- ---------- ---------- Costs and expenses: Research and development 7,944 8,949 24,738 22,683 General and administrative 2,448 2,240 7,343 6,040 ---------- ---------- ---------- ---------- Total costs and expenses 10,392 11,189 32,081 28,723 ---------- ---------- ---------- ---------- Net income (loss) $181 $689 ($4,384) ($4,251) ========== ========== ========== ========== Net income (loss) per share: Basic $0.01 $0.04 ($0.24) ($0.23) Diluted $0.01 $0.04 ($0.24) ($0.23) ========== ========== ========== ========== Weighted average number of shares: Basic 18,668 18,545 18,637 18,506 Diluted 19,355 18,845 18,637 18,506 ========== ==========


                                        Three Months Ended
                                            March 31,
                                     ---------------------
                                         2000       1999
                                     ---------- ----------
Revenues:

  Revenue under agreements
   with third parties                  $12,450     $6,462
  Interest and other income              3,050      2,373
                                     ---------- ----------
    Total revenues                      15,500      8,835
                                     ---------- ----------
Costs and expenses:
  Research and development              11,069      8,280
  General and administrative             2,458      2,445
  Interest expense                       1,203        --
                                     ---------- ----------
    Total costs and expenses            14,730     10,725
                                     ---------- ----------
Net income (loss)                         $770    ($1,890)
                                     ========== ==========
Net income (loss) per share: Basic $0.04 ($0.10) Diluted $0.04 ($0.10) ========== ========== Weighted average number of shares: Basic 19,460 18,618 Diluted 21,526 18,618 ========== ==========

See accompanying notes






PROTEIN DESIGN LABS, INC. CONDENSED
CONSOLIDATED BALANCE SHEETS

(In thousands, except par value per share)
September 30, December 31, 1999 1998 ------------ ----------- (unaudited) ASSETS Current assets: Cash and cash equivalents $14,341 $27,907 Short-term investments 6,538 59,233 Other current assets 3,000 4,608 ------------ ----------- Total current assets 23,879 91,748 Property and equipment, net 37,727 23,016 Long-term investments 113,789 56,299 Other assets 550 787 ------------ ----------- $175,945 $171,850 ============ =========== LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable $822 $1,310 Accrued compensation 1,156 925 Accrued clinical trials 203 1,293 Other accrued liabilities 1,700 3,591 Deferred revenue 3,169 2,235 Current portion of long-term debt 343 -- ------------ ----------- Total current liabilities 7,393 9,354 Long-term debt 9,807 -- ------------ ----------- Total liabilities 17,200 9,354 Stockholders' equity: Preferred stock, par value $0.01 per share, 10,000 shares authorized; no shares issued and outstanding -- -- Common stock, par value $0.01 per share, 40,000 shares authorized; 18,723 and 18,595 issued and outstanding at September 30, 1999 and December 31, 1998, respectively 187 186 Additional paid-in capital 233,405 231,035 Accumulated deficit (73,269) (68,884) Accumulated other comprehensive income (loss) (1,578) 159 ------------ ----------- Total stockholders' equity 158,745 162,496 ------------ ----------- $175,945 $171,850


                                                      March 31,  December 31,
                                                       2000          1999
                                                   ------------  -----------
                                                   (unaudited)
                     ASSETS
  Current assets:
     Cash and cash equivalents                        $177,188      $17,138
     Marketable securities                             114,438      120,098
     Other current assets                                6,290        6,719
                                                   ------------  -----------
      Total current assets                             297,916      143,955
     Property and equipment, net                        37,998       38,047
     Other assets                                        5,333          549
                                                   ------------  -----------
                                                      $341,247     $182,551
                                                   ============  ===========

        
LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable $541 $877 Accrued compensation 1,137 1,090 Accrued clinical trials 883 712 Other accrued liabilities 2,251 2,762 Deferred revenue 2,792 2,275 Current portion of long-term debt 377 368 Accured interest 1,007 -- ------------ ----------- Total current liabilities 8,988 8,084 Convertible notes 150,000 -- Long-term debt 9,624 9,724 ------------ ----------- Total liabilities 168,612 17,808 Stockholders' equity: Preferred stock, par value $0.01 per share, 10,000 shares authorized; no shares issued and outstanding -- -- Common stock, par value $0.01 per share, 40,000 shares authorized; 19,574 and 19,281 issued and outstanding at March 31, 2000 and December 31, 1999, respectively 196 193 Additional paid-in capital 253,454 245,812 Accumulated deficit (78,447) (79,217) Accumulated other comprehensive income (loss) (2,568) (2,045) ------------ ----------- Total stockholders' equity 172,635 164,743 ------------ ----------- $341,247 $182,551 ============ ===========

See accompanying notes






PROTEIN DESIGN LABS, INC. CONDENSED
CONSOLIDATED STATEMENTS OF CASH FLOWS INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS

(unaudited)
(In thousands)
Nine Months Ended September 30, ---------------------- 1999 1998 ---------- ---------- Cash flows from operating activities: Net loss ($4,384) ($4,251) Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization 2,667 2,595 Other (175) 735 Changes in assets and liabilities: Other current assets 1,608 (9,028) Accounts payable (488) 700 Accrued liabilities (2,751) 2,508 Deferred revenue 934 1,125 ---------- ---------- Total adjustments 1,795 (1,365) ---------- ---------- Net cash used in operating activities (2,589) (5,616) Cash flows from investing activities: Purchases of short- and long-term investments (81,336) (92,320) Maturities of short- and long-term investments 74,900 145,000 Capital expenditures (17,624) (14,810) Proceeds from sale of equipment 325 - (Increase) decrease in other assets 237 (114) ---------- ---------- Net cash provided by (used in) investing activities (23,498) 37,756 Cash flows from financing activities: Proceeds from issuance of capital stock 2,371 3,334 Proceeds from long-term debt 10,150 - ---------- ---------- Net cash provided by financing activities 12,521 3,334 ---------- ---------- Net increase (decrease) in cash and cash equivalents (13,566) 35,474 Cash and cash equivalents at beginning of period 27,907 9,266 ---------- ---------- Cash and cash equivalents at end of period $14,341 $44,740


                                                         Three Months Ended
                                                              March 31,
                                                       ----------------------
                                                           2000        1999
                                                       ----------  ----------
Cash flows from operating activities:
  Net income (loss)                                         $770     ($1,890)
  Adjustments to reconcile net income (loss) to net
    cash used in operating activities:
    Depreciation and amortization                            761         857
    Amortization of convertible debt offering costs           90          --
    Other                                                    301         185
  Changes in assets and liabilities:
    Other current assets                                    (291)       (827)
    Accounts payable                                        (337)        164
    Accrued liabilities                                      714      (2,131)
    Deferred revenue                                         517       1,791
                                                       ----------  ----------
Total adjustments                                          1,755          39
                                                       ----------  ----------
    Net cash provided by (used in) operating activities    2,525      (1,851)

Cash flows from investing activities:
  Purchases of marketable securities                          --     (59,500)
  Maturities of marketable securities                      5,000      61,400
  Property, plant and equipment                             (876)       (770)
  Proceeds from sale of equipment                             --          --
  Increase in other assets                                (4,154)       (296)
                                                       ----------  ----------
    Net cash provided by (used in)
       investing activities                                  (30)        834

Cash flows from financing activities:
  Proceeds from convertible debt                         150,000          --
  Proceeds from issuance of capital stock                  7,645         462
  Payments on long-term debt                                 (90)         --
                                                       ----------  ----------
    Net cash provided by financing activities            157,555         462
                                                       ----------  ----------

Net increase (decrease) in cash and cash equivalents     160,050        (555)

Cash and cash equivalents at beginning of period          17,138      27,907
                                                       ----------  ----------
Cash and cash equivalents at end of period              $177,188     $27,352
                                                       ==========  ==========

See accompanying notes






PROTEIN DESIGN LABS, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS September 30, 1999
March 31, 2000

(unaudited)

Summary of Significant Accounting Policies

Organization and Business

Since the Company'sour founding in 1986, a primary focus of itsour operations has been research and development. Achievement of successful research and development and commercialization of products derived from suchour efforts is subject to high levels of risk and significant resource commitments. The Company has a historyOur expenses have generally exceeded revenues. As of operatingMarch 31, 2000, we had an accumulated deficit of approximately $78.4 million. We believe that our losses may increase because of the extensive resource commitments required to achieve regulatory approval and expects tocommercial success for any individual product. For example, over the next several years, we will incur substantial additional expenses over at least the next few years as it continueswe continue to develop its proprietaryand manufacture our potential products, devote significant resources to preclinical studies, clinical trials,invest in new research areas and improve and expand our manufacturing and to defend its patents and other proprietary rights. The Company's revenues to date have consisted principally of research and development funding, licensing and signing fees, milestone payments and royalties from pharmaceutical and biotechnology companies undercapabilities. Since we or our collaborative research and development, humanization, patent licensing and clinical supply agreements. These revenues may vary considerably from quarter to quarter and from year to year, and revenues in any periodpartners or licensees may not be predictiveable to successfully develop additional products, obtain required regulatory approvals, manufacture products at an acceptable cost and with appropriate quality, or successfully market such products with desired margins, we may never achieve profitable operations. The amount of revenues in any subsequent period, and variations may be significant depending on the terms of the particular agreements. The Company receives royalties on sales of Synagisr, Herceptinr and Zenapaxr. Royalty revenues from third party sales of these licensed humanized antibodies are subject to the specific terms of each agreement and, under the Company's policy, are recognized by the Company during the quarter such royalties are reported to PDL. This method of revenue recognition may increase fluctuations reported in any particular quarter since the agreements generally provide for royalty reports to the Company following completion of each calendar quarter or semi-annual period. Further, royalty revenues are unpredictable as they are dependent upon numerous factors including the seasonality of sales of licensed products, the existence of competing products, the marketing efforts of the Company's licenseesnet losses and the rights certain licensees havetime required to partially offset certain previously paid milestones and third party royalties against royalties payablereach sustained profitability are highly uncertain. We cannot assure you that we will be able to the Company. In addition, expenses may fluctuate from quarter to quarter due to the timing of certain expenses, including milestone payments that may be payable by the Company under certain licensing arrangements. Although the Company anticipates entering into new collaborations from time to time, the Company presently does not know whetherachieve or not it will realize non-royalty revenue from its new and proposed collaborations at levels commensurate with the revenue historically recognized under its older collaborations. Moreover, the Company anticipates that it will incur significant operating expenses as the Company significantly increases its research and development, manufacturing, preclinical, clinical, marketing and administrative and patent activities. In particular, thesustain profitability.

Our commitment of resources to the development of ZenapaxZenapax[R] and the humanized anti-IL-4 antibody, two humanized antibodies with respect to which PDLwe recently obtained development rights, taken together with the continued development of the Company'sour existing products, will require significant additional funds for development. Accordingly,These operating expenses may also increase as some of our earlier stage potential products move into later stage clinical development, as additional potential products are selected as clinical candidates for further development, as we invest in additional manufacturing capacity, as we defend or prosecute our patents and patent applications, and as we invest in research or acquire additional technologies, product candidates or businesses.

In the absence of substantial revenues from new corporate collaborations or patent licensing or humanization agreements, significant royalties on sales of products licensed under the Company'sour intellectual property rights, product sales or other uncertain sources the Company expects toof revenue, we will incur substantial operating losseslosses.

Our revenues have varied in the foreseeable future aspast and will likely continue to fluctuate considerably from quarter to quarter and from year to year. As a result, our revenues in any period may not be predictive of revenues in any subsequent period. Our royalty revenues may be unpredictable and may fluctuate since they depend upon the Company undertakes developmentseasonality of Zenapaxsales of licensed products, the existence of competing products, the marketing efforts of our licensees, potential reductions in autoimmune indicationsroyalties payable to us due to credits for prior payments to us, the timing of royalty reports, some of which are required quarterly and others semi-annually, our method of accounting for royalty revenues from our licensees and our ability to successfully defend and enforce our patents. Other revenue may also be unpredictable and may fluctuate due to the humanized anti-IL-4 antibody, as certaintiming of its earlier stage potential products move into later stage clinical development, as additional potential products are selected as clinical candidatespayments of non-recurring licensing and signing fees and payments for further development, as the Company invests in additional manufacturing capacity, as the Company defends or prosecutes its patentsservices and achievement of milestones under new and existing collaborative, humanization, and patent applicationslicensing agreements. Revenue historically recognized under our prior agreements may not be an indicator of revenue from any future collaborations.

In addition, our expenses may be unpredictable and asmay fluctuate from quarter to quarter due to the Company investstiming of expenses, which may include payments owed by us under licensing arrangements and due to our policy of recording expenses under certain collaborative agreements during the quarter in research or acquires additional technologies, product candidates or businesses. which such expenses are reported to us.

Basis of Presentation and Responsibility for Quarterly Financial Statements

The consolidated balance sheet as of September 30, 1999,March 31, 2000, and the consolidated statements of operations for the three and nine month periods and cash flows for the ninethree month periods ended September 30,March 31, 2000 and 1999 and 1998 are unaudited, but include all adjustments (consisting only of normal recurring adjustments) which the Company considerswe consider necessary for a fair presentation of theour financial position at such dates and the operating results and cash flows for those periods. During the third quarter of 1999, the Company formed two wholly owned subsidiaries to facilitate the purchase of the Company's Fremont, California facilities. Financial statements are presented on a consolidated basis to include these subsidiaries. Although the Company believeswe believe that the disclosures in theseour financial statements are adequate to make the information presented not misleading, certain information and footnote information normally included in financial statements prepared in accordance with accounting principles generally accepted accounting principlesin the U.S. have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. The accompanying financial statements should be read in conjunction with the Company'sour Annual Report on Form 10-K, filed with the Securities and Exchange Commission, for the year ended December 31, 1998.1999. The balance sheet as of December 31, 19981999 is derived from audited financial statements. Results for any quarterly period are not necessarily indicative of results for any other quarterly period or for the entire year.

Cash Equivalents, InvestmentsMarketable Securities and Concentration of Credit Risk The Company considers

We consider all highly liquid investments purchased with a maturity of three months or less at the date of acquisitionpurchase to be cash equivalents. Included in theThe "Other" adjustments line item in the Statements of Cash Flows isrepresents the accretion of the book value of certain debt securities. The Company places itsWe place our cash, and short-term and long-term investmentsmarketable securities with high-credit-quality financial institutions and in securities of the U.S. government and U.S. government agencies and, by policy, limitslimit the amount of credit exposure in any one financial instrument. To date, the Company haswe have not experienced credit losses on investments in these instruments. Cash and cash equivalents for the period ended September 30, 1999 decreased primarily as a result of the purchases of short-term investments and long- term investments. Long-term investments increased during the period as a result of the Company purchasing investments with maturities longer than twelve months.

Revenue Recognition

Contract revenues from research and development arrangements are recorded as earned based on the performance requirements of the contracts. Revenues from achievement of milestone events are recognized when the funding party agrees that the scientific or clinical results stipulated in the agreement have been met. Deferred revenue arises principally due to timing of cash payments received under research and development contracts. The Company's

Our collaborative, humanization and patent licensing agreements with third parties provide for the payment of royalties to the Companyus based on net sales of the licensed product under the agreement. The agreements generally provide for royalty payments to the Companyus following completion of each calendar quarter or semi-annual period and royalty revenue is recognized when royalty reports are received from the third party. Non- refundableNon-refundable signing and licensing fees under these arrangementscollaborative and humanization agreements are recognized over the period in which performance obligations are achieved. Non-refundable signing and licensing fees under patent licensing agreements are recognized as revenue when there are no future performance obligations remaining with respect to such fees.

In December 1999, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 101, "Revenue Recognition in Financial Statements" (SAB 101). We are evaluating the effects, if any, that the adoption of SAB 101 in the second quarter of 2000 may have on the results of our operations or our financial position. We have been advised that the Securities and Exchange Commission intends to provide additional guidance during the second quarter of 2000 with respect to the implementation of SAB 101. It is currently unknown whether such guidance and implementation of SAB 101 will require us to revise our revenue recognition practices or to restate revenues for the first quarter of 2000.

Net Income (Loss) Per Share

In accordance with Financial Accounting Standards Board Statement No. 128, "Earnings Per Share" ("FAS 128"), basic and diluted net income (loss) per share amounts have been computed using the weighted average number of shares of common stock outstanding during the periods presented. Calculation of diluted net income per share includes the dilutive effect of outstanding stock options. If the Company hadoptions, but does not include outstanding convertible debt as its effect is anti-dilutive. We incurred a net loss position for the applicablethree month period as is the case for the nine month periods ended September 30,March 31, 1999, and 1998, FAS 128 specifies that the Company shallas such, we did not include the effect of outstanding stock options outstanding forin the applicable perioddiluted net loss per share calculation as thetheir effect would be antidilutive. is anti-dilutive.

The following is a reconciliation of the numerators and denominators of the basic and diluted net income (loss) per share computations for the periods presented below:
Three Months Ended Nine Months Ended September 30, September 30, --------------------- --------------------- 1999 1998 1999 1998 ---------- ---------- ---------- ---------- Numerator: Net income (loss) $181 $689 $(4,384) $(4,251) ========== ========== ========== ========== Denominator: Basic net income (loss) per share - weighted-average shares 18,668 18,545 18,637 18,506 Dilutive potential common shares: Stock Options 687 300 -- -- ---------- ---------- ---------- ---------- Denominator for diluted net loss per share 19,355 18,845 18,667 18,506 ========== ========== ========== ========== Basic net income (loss) per share $0.01 $0.04 $(0.24) $(0.23) ========== ========== ========== ========== Diluted net income (loss) per share $0.01 $0.04 $(0.24) $(0.23) ========== ========== ========== ==========

(In thousands, except basic and diluted net income (loss) per share)



                                        Three Months Ended
                                            March 31,
                                       -------------------
                                         2000      1999
                                       --------- ---------
Numerator:
 Net income (loss)                         $770   ($1,890)
                                       ========= =========
Denominator:
 Basic net income (loss) per share -
  weighted-average shares                19,460    18,618
 Dilutive potential common shares:
  Stock Options                           2,066       --
                                       --------- ---------
Denominator for diluted net income
 (loss) per share                        21,526    18,618
                                       ========= =========

Basic net income (loss) per share         $0.04    ($0.10)
                                       ========= =========

Diluted net income (loss) per share       $0.04    ($0.10)
                                       ========= =========

Comprehensive Income (Loss) In accordance with Financial Accounting Standards Statement No. 130, "Reporting Comprehensive Income," ("FAS 130"),

During the Company is required to displaythree months ended March 31, 2000 and 1999, total comprehensive income (loss) was $0.2 million and its components as part of the$(2.4) million, respectively. The Company's complete set of financial statements. The measurement and presentation of net loss did not change. Comprehensiveother comprehensive income (loss) is comprised of net loss and other comprehensive income (loss). Other comprehensive income (loss) includes certain changes in equity of the Company that are excluded from net loss. Specifically, FAS 130 requires unrealized gains and losses on the Company's holdings of available-for-sale securities, which were reported separately in stockholders' equity, to be included in accumulated other comprehensive income (loss). FAS 130 permits the disclosure of this information in notes to interim financial statements and the Company has elected this approach. For the three month periods ended September 30, 1999 and 1998, total comprehensive income (loss) amounted to ($0.1) million and $0.9 million respectively. For the nine month periods ended September 30, 1999 and 1998, total comprehensive income (loss) amounted to ($6.1) million and ($4.2) million, respectively. securities.

Derivative Instruments and Hedging Activities

In June 1998, the Financial Accounting Standards Board issued Statement No. 133 "Accounting for Derivative Instruments and Hedging Activities" ("FAS 133"). FAS 133 is not required to be adopted until 2001. However, the Company has reviewed FAS 133 and because it does not use derivatives, the adoption of FAS 133 is not expected to effect the results of operations or the financial position of the Company.

Management Estimates

The preparation of financial statements in conformity with accounting principles generally accepted accounting principlesin the United States requires the use of management's estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. For example, the Company haswe have a policy of recording expenses for clinical trials based upon pro rating estimated total costs of a clinical trial over the estimated length of the clinical trial and the number of patients anticipated to be enrolled in the trial. Expenses related to each patient are recognized ratably beginning upon entry into the trial and over the course of the trial. In the event of early termination of a clinical trial, management accrues an amount based on its estimate of the remaining non-cancellable obligations associated with the winding down of the clinical trial. TheseOur estimates and assumptions could differ significantly from the amounts which may actually be realized. Property, Plant and Equipment Property, plant and equipment increased

Convertible Notes

In February 2000, we issued 5.50% Convertible Subordinated Notes due February 15, 2007 with a principal amount of $150 million (the Convertible Notes). The Convertible Notes are convertible into our common stock at September 30, 1999 compareda conversion price of $151.00 per share, subject to December 31, 1998 primarilyadjustment as a result of certain events and at the purchaseholders' option. Interest on the Convertible Notes is payable semiannually in arrears on February 15 and August 15 of each year. The Convertible Notes are unsecured and are subordinated to all our existing and future Senior Indebtedness (as defined in the indenture relating to the Convertible Notes). The Convertible Notes may be redeemed at our option, in whole or in part, beginning on February 15, 2003 at the redemption prices set forth in the Convertible Notes indenture. In May 2000, we filed a shelf registration statement covering resales of the Company's Fremont, California facilities which has an estimated useful lifeConvertible Notes and the common stock issuable upon conversion of thirty years. Accrued Clinical Trials Accrued clinical trials reflected a $1.1 million reductionthe Convertible Notes. Issuance costs associated with the favorable resolution of a contract-related dispute with Boehringer Mannheim GmbH (which was acquired by affiliates of F. Hoffmann-La Roche Ltd). Long-Term Debt In September 1999, Fremont Holding L.L.C. (a wholly owned subsidiary of Protein Design Labs, Inc.) obtained a $10.2 millionConvertible Notes are included in other assets and are amortized to interest expense over the term loan to purchase its Fremont, California facilities. The loan bears interest at the rate of 7.64% per year amortized over 15 years with principal and interest payable monthly beginning in October 1999. The loan is secured by the Company's Fremont, California facilities and is subject to the terms and covenants of the loan agreement. debt.

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This Quarterly Report contains forward-looking statements which involve risks and uncertainties. The Company's actual results may differ significantly from the results discussed in the forward-looking statements. Factors that might cause such a difference include, but are not limited to those discussed in "Risk Factors" as well as those discussed elsewhere in this document and the Company's Annual Report on Form 10-K, filed with the Securities and Exchange Commission for the year ended December 31, 1998. 1999.

OVERVIEW

Since the Company'sour founding in 1986, a primary focus of itsour operations has been research and development. Achievement of successful research and development and commercialization of products derived from suchour efforts is subject to high levels of risk and significant resource commitments. The Company has a historyOur expenses have generally exceeded revenues. As of operatingMarch 31, 2000, we had an accumulated deficit of approximately $78.4 million. We believe that our losses may increase because of the extensive resource commitments required to achieve regulatory approval and expects tocommercial success for any individual product. For example, over the next several years, we will incur substantial additional expenses over at least the next few years as it continueswe continue to develop its proprietaryand manufacture our potential products, devote significant resources to preclinical studies, clinical trials,invest in new research areas and improve and expand our manufacturing and to defend its patents and other proprietary rights. The Company's revenues to date have consisted principally of research and development funding, licensing and signing fees, milestone payments and royalties from pharmaceutical and biotechnology companies undercapabilities. Since we or our collaborative research and development, humanization, patent licensing and clinical supply agreements. These revenues may vary considerably from quarter to quarter and from year to year, and revenues in any periodpartners or licensees may not be predictiveable to successfully develop additional products, obtain required regulatory approvals, manufacture products at an acceptable cost and with appropriate quality, or successfully market such products with desired margins, we may never achieve profitable operations. The amount of revenues in any subsequent period, and variations may be significant depending on the terms of the particular agreements. The Company receives royalties on sales of Synagis[R], Herceptin[R] and Zenapax[R]. Royalty revenues from third party sales of these licensed humanized antibodies are subject to the specific terms of each agreement and, under the Company's policy, are recognized by the Company during the quarter such royalties are reported to PDL. This method of revenue recognition may increase fluctuations reported in any particular quarter since the agreements generally provide for royalty reports to the Company following completion of each calendar quarter or semi-annual period. Further, royalty revenues are unpredictable as they are dependent upon numerous factors including the seasonality of sales of licensed products, the existence of competing products, the marketing efforts of the Company's licenseesnet losses and the rights certain licensees havetime required to partially offset certain previously paid milestones and third party royalties against royalties payablereach sustained profitability are highly uncertain. We cannot assure you that we will be able to the Company. In addition, expenses may fluctuate from quarter to quarter due to the timing of certain expenses, including milestone payments that may be payable by the Company under certain licensing arrangements. Although the Company anticipates entering into new collaborations from time to time, the Company presently does not know whetherachieve or not it will realize non-royalty revenue from its new and proposed collaborations at levels commensurate with the revenue historically recognized under its older collaborations. Moreover, the Company anticipates that it will incur significant operating expenses as the Company significantly increases its research and development, manufacturing, preclinical, clinical, marketing and administrative and patent activities. In particular, thesustain profitability.

Our commitment of resources to the development of ZenapaxZenapax[R] and the humanized anti-IL-4 antibody, two humanized antibodies with respect to which PDLwe recently obtained development rights, taken together with the continued development of the Company'sour existing products, will require significant additional funds for development. Accordingly,These operating expenses may also increase as some of our earlier stage potential products move into later stage clinical development, as additional potential products are selected as clinical candidates for further development, as we invest in additional manufacturing capacity, as we defend or prosecute our patents and patent applications, and as we invest in research or acquire additional technologies, product candidates or businesses.

In the absence of substantial revenues from new corporate collaborations or patent licensing or humanization agreements, significant royalties on sales of products licensed under the Company'sour intellectual property rights, product sales or other uncertain sources the Company expects toof revenue, we will incur substantial operating losseslosses.

Our revenues have varied in the foreseeablepast and will likely continue to fluctuate considerably from quarter to quarter and from year to year. As a result, our revenues in any period may not be predictive of revenues in any subsequent period. Our royalty revenues may be unpredictable and may fluctuate since they depend upon the seasonality of sales of licensed products, the existence of competing products, the marketing efforts of our licensees, potential reductions in royalties payable to us due to credits for prior payments to us, the timing of royalty reports, some of which are required quarterly and others semi-annually, our method of accounting for royalty revenues from our licensees and our ability to successfully defend and enforce our patents. Other revenue may also be unpredictable and may fluctuate due to the timing of payments of non-recurring licensing and signing fees and payments for manufacturing services and achievement of milestones under new and existing collaborative, humanization, and patent licensing agreements. Revenue historically recognized under our prior agreements may not be an indicator of revenue from any future ascollaborations.

PDL has recognized revenue during the Company undertakes developmentquarter ended March 31, 2000, in accordance with its historical practice. In December 1999, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 101, "Revenue Recognition in Financial Statements" (SAB 101). We are evaluating the effects, if any, that the adoption of ZenapaxSAB 101 in autoimmune indicationsthe second quarter of 2000 may have on the results of our operations or our financial position. We have been advised that the Securities and Exchange Commission intends to provide additional guidance during the second quarter of 2000 with respect to the implementation of SAB 101. It is currently unknown whether such guidance and the humanized anti-IL-4 antibody, as certainimplementation of its earlier stage potential products move into later stage clinical development, as additional potential products are selected as clinical candidatesSAB 101 will require us to revise our revenue recognition practices or to restate revenues for further development, as the Company invests in additional manufacturing capacity, as the Company defends or prosecutes its patentsfirst quarter of 2000.

In addition, our expenses may be unpredictable and patent applications and as the Company invests in research or acquires additional technologies, product candidates or businesses. Contract revenuesmay fluctuate from research and development are recorded as earned based on the performance requirements of the contracts. Revenues from achievement of milestone events are recognized when the funding party agrees that the scientific or clinical results stipulated in the agreement have been met. Deferred revenue arises principallyquarter to quarter due to the timing of cashexpenses, which may include payments receivedowed by us under researchlicensing arrangements and development contracts. due to our policy of recording expenses under collaborative agreements during the quarter in which such expenses are reported to us.

RESULTS OF OPERATIONS

Three Months Ended September 30,March 31, 2000 and 1999 and 1998

The Company's total revenues for the three months ended September 30, 1999March 31, 2000 were $10.6$15.5 million compared to $11.9$8.8 million in the thirdfirst quarter of 1998.1999. Total revenues recognized under agreements with third parties were $8.4$12.5 million in the thirdfirst quarter of 19992000 compared to $9.6$6.5 million in the comparable period in 1998.1999. Interest and other income was $2.2$3.0 million in the thirdfirst quarter of 19992000 compared to $2.3$2.4 million in the comparable period in 1998. 1999, reflecting the increased interest earned on our cash, cash equivalents and marketable securities balances as a result of our private placement of $150 million in convertible subordinated notes in February 2000.

Revenues under agreements with third parties of $8.4$12.5 million for the three months ended September 30, 1999March 31, 2000 consisted principally of royalties, signing and licensing fees, research and development reimbursement funding, milestone payments earned under licensing agreements royalties, signing and licensing fees and research and development reimbursement funding.a license maintenance fee. In the thirdfirst quarter of 1998,1999, revenues of $9.6$6.5 million under agreements with third parties consisted principally of a $6.0$3.0 million licensingnon-refundable, non-creditable signing and signinglicensing fee from Genentech, Inc. ("Genentech"), milestone payments earned under licensing agreements, manufacturing services revenues under clinical supply agreements,Scil Biomedicals GmbH (Scil) for rights to develop and market our SMART[TM] (humanized) Anti-L-Selectin Antibody in Europe, royalties and research and development reimbursement funding and royalties. funding.

Total costs and expenses for the three months ended September 30, 1999March 31, 2000 were $10.4$14.7 million compared with $11.2$10.7 million in the comparable period in 1998. Total cost and expenses in the 1999 third quarter reflected a $1.1 million reduction associated with the favorable resolution of a contract dispute with a third party. In 1998, total cost and expenses in the third quarter included a $1.0 million licensing and signing fee paid to Genentech. Excluding these non-recurring items in the third quarters of 1999 and 1998, total costs and expenses increased by $1.3 million, primarily due to the addition of staff in the Company's pharmaceutical research and development programs, administrative functions and associated expenses to manage and support the Company's expanding operations. 1999.

Research and development expenses for the three month period ended September 30, 1999March 31, 2000 were $7.9$11.1 million compared with $8.9$8.3 million in the year- earlier quarter. Excluding the two non-recurring items discussed above, researchResearch and development costs increased by $1.1 million, primarily due to the addition of staff, the continuationexpansion of clinical trials and expansion ofdevelopment programs, research and pharmaceutical development capabilities, including support for both clinical development and manufacturing process development. development and payments related to manufacturing of humanized anti-IL-4.

General and administrative expenses for the three months ended September 30, 1999March 31, 2000 increased to $2.4$2.5 million from $2.2$2.4 million in the comparable period in 1998. These increases were primarily the result of increased staffing and associated expenses to manage and support the Company's expanding operations. Nine Months Ended September 30, 1999 and 1998 The Company's total revenues1999.

Interest expense for the nine months ended September 30, 1999 were $27.7 million compared with $24.5 million for the nine months ended September 30, 1998. Total revenues recognized under agreements with third parties were $20.9 million in the ninethree month period of 1999 compared with $17.3 million in the comparable period in 1998. Interest and other income was $6.8 million in the nine month period of 1999 compared with $7.2 million in the comparable period in 1998. Revenues under agreements with third parties of $20.9 million for the nine months ended September 30, 1999 consisted principally of royalties, signing and licensing fees, maintenance fees and research and development reimbursement funding. In the comparable period of 1998, revenues of $17.3 million under agreements with third parties consisted principally of signing and licensing fees, milestone payments earned under licensing agreements, manufacturing services revenues under clinical supply agreements, research and development reimbursement funding and royalties. Total costs and expenses for the nine months ended September 30, 1999March 31, 2000 increased to $32.1$1.2 million from $28.7 million in the comparable period in 1998. Excluding non-recurring expense adjustments due to one-time events, the increase in costs and expenses was primarily due to the addition of staff in the Company's pharmaceutical research and development programs, administrative functions andinterest expense associated expenses to manage and support the Company's expanding operations. Research and development expenses for the nine month period ended September 30, 1999 increased to $24.7 million from $22.7 million in the comparable period in 1998. Excluding the two non-recurring items discussed above, the increase in costs was primarily due to the addition of staff, the continuation of clinical trials and expansion of research and pharmaceutical development capabilities, including support for both clinical development and manufacturing process development. General and administrative expenses for the nine months ended September 30, 1999 increased to $7.3 million from $6.0 million in the comparable period in 1998. These increases were primarily the result of increased staffing and associated expenses to manage and support the Company's expanding operations. with our convertible subordinated notes issued on February 15, 2000.

LIQUIDITY AND CAPITAL RESOURCES

To date the Company haswe have financed itsour operations primarily through public and private placements of equity securities, research and development revenues, and interest income on invested capital.capital and a private placement of $150 million in convertible subordinated notes in February 2000. At September 30, 1999, the CompanyMarch 31, 2000, we had cash, cash equivalents and investmentsmarketable securities in the aggregate of $134.7$291.6 million, compared to $143.4$137.2 million at December 31, 1998. 1999.

As set forth in the Consolidated Statements of Cash Flows, net cash provided by operating activities was $2.5 million for the three months ended March 31, 2000 compared to net cash used in operating activities was $2.6 million for the nine months ended September 30, 1999 compared to $5.6of $1.9 million in the same period in 1998.1999. This change was primarily the result of changesour net income for the first quarter of 2000 as compared to a net loss in other current assets and accrued liabilities. the comparable period of 1999.

As set forth in the Statements of Cash Flows, net cash used in investing activities for the nine months ended September 30, 1999 was $23.5 million resulting primarily from the reinvestment of maturing investments and the purchase of the Company's Fremont, California facilities. Net cash provided by investing activities for the comparable period in 1998 was $37.8 million resulting primarily from the maturities of short- and long-term investments. As set forth in theConsolidated Statements of Cash Flows, net cash provided by financing activities for the ninethree months ended September 30, 1999March 31, 2000 was $12.5$157.6 million, resulting primarily from the proceeds associated with the long-term financing of the Company's purchasea private placement of its Fremont, California facilities. Net cash provided by financing activities$150 million in the comparable periodconvertible subordinated notes in 1998 was $3.3 million resulting primarily fromFebruary 2000 and the exercise of outstanding stock options. The Company's

Our future capital requirements will depend on numerous factors, including, among others, royalties from sales of products of third party licensees, including Synagis, HerceptinSynagis[R], Herceptin[R] and Zenapax; theour ability of the Company to enter into additional collaborative, humanization and patent licensing arrangements; the progress of the Company's product candidates in clinical trials; the ability of the Company'sour licensees to obtain regulatory approval and successfully manufacture and market products licensed under the Company'sour patents; the continued or additional support by our collaborative partners or other third parties of research and development efforts and clinical trials; enhancement of existing and investment in new research and development programs; the time required to gain regulatory approvals; the resources the Company devoteswe devote to self-funded products, manufacturing facilities and methods and advanced technologies; theour ability of the Company to obtain and retain funding from third parties under collaborative arrangements; theour continued development of internal marketing and sales capabilities; the demand for the Company'sour potential products, if and when approved; potential acquisitions of technology, product candidates or businesses by the Company;us; and the costs of defending or prosecuting any patent opposition or litigation necessary to protect the Company'sour proprietary technology. In order to develop and commercialize itsour potential products the Companywe may need to raise substantial additional funds through equity or debt financings, collaborative arrangements, the use of sponsored research efforts or other means. No assurance can be given that such additional financing will be available on acceptable terms, if at all, and such financing may only be available on terms dilutive to existing stockholders. The Company believesWe believe that existing capital resources including the proceeds of the issue and sale in February 2000 of $150 million of our 5.50% Convertible Subordinated Notes due February 15, 2007, will be adequate to satisfy itsour capital needs through at least 2001. YEAR 2000 COMPLIANCE As is true for most companies, the ability of the Company's systems and equipment as well as those of its key suppliers to address the Year 2000 ("Y2K") issue presents a potential risk for the Company. If systems software and/or equipment containing embedded software or controllers do not correctly recognize date information when the year changes to 2000, there could be an adverse impact on the Company's operations. The risk for the Company exists in two areas: systems used by the Company to run its business and systems used by the Company's suppliers. The Company is currently evaluating its exposure in these two areas and has completed a review of at least 90% of potentially affected systems. The Company has also reviewed, but views as a much less significant risk, claims related to potential warranty or other claims from its collaborative research customers. Based on a comprehensive assessment recently completed by an outside consultant retained by the Company, the Company believes that its most important information systems, equipment and facilities are Y2K-compliant. To date, the Company has either received software or system upgrades or assurances that Y2K-compliant software will be made available in a manner designed for the Company to timely address the Y2K issue with respect to its key systems. The outside consultant retained by the Company performed a comprehensive inventory and review of all significant systems and equipment of the Company and is in the process of preparing a contingency plan for any mission critical systems that may present potential Y2K problems. The Company has established a Y2K committee with responsibility for coordinating awareness and identifying potential Y2K risk areas within the Company. As part of its comprehensive review of potentially affected systems, equipment and facilities, the Company is also reviewing controllers used to perform key functions in its manufacturing facility in Plymouth, Minnesota. At this time, the Company has been advised that the need for remediation or replacement plans for systems and equipment is minimal. For Y2K non-compliance issues identified to date, the cost of upgrade or remediation has not been and is not expected to be material to the Company's operating results. The Company has completed a work and project plan for Company awareness and a detailed assessment and inventory review process corresponding to the five-step General Accounting Office recommended process guidelines. For Y2K compliance, the total out-of-pocket costs expended to date and currently planned budget expenditures are expected to be less than the originally estimated $100,000 amount budgeted. However, if implementation of scheduled replacement systems is significantly delayed, or if any significant new non-compliance issues are identified, the Company's results of operations or financial condition could be materially adversely affected. The Company has identified and inquired of most of its critical suppliers and has ongoing inquiries of other suppliers in order to determine whether the operations and the products or services provided by these identified vendors are Y2K-compliant. Where practicable, the Company will attempt to mitigate its risks with respect to the failure of vendors to be Y2K-compliant. In the event that vendors are not compliant, the Company may adjust its purchasing decisions or seek alternative sources of supplies or services. However, many of the Company's vendors have been qualified for regulatory purposes such that qualifying new vendors could involve significant time and resource commitments by the Company. Failure of vendors to be Y2K-compliant remains a possibility and could limit the ability of the Company to manufacture material for clinical studies or timely conduct regulatory compliance programs that would result in a delay in the initiation or continuation of certain planned clinical studies. Significant delays or expenditures due to vendors' failures to become Y2K-compliant could have an adverse impact on the Company's results of operations or financial condition. With respect to research conducted by the Company in support of its collaborative research customers, many of the systems and software used to support such efforts are new. Where appropriate, the Company has, as a condition to accepting such systems and software, required that the systems be Y2K-compliant. 2002.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The Company maintains a non-trading investment portfolio of investment grade, highly liquid, debt securities which limits the amount of credit exposure to any one issue, issuer, or type of instrument. The Company does not use derivative financial instruments for speculative or trading purposes. The securities in the Company's investment portfolio are not leveraged and are classified as available for sale and therefore are subject to interest rate risk. The Company does not currently hedge interest rate exposure. As of September 30, 1999,March 31, 2000, there has been no material change in the Company's interest rate exposure from that described in the Company's Annual Report on Form 10-K for the year ended December 31, 1998.1999.

PART II. OTHER INFORMATION

ITEM 5. OTHER INFORMATION - RISK FACTORS

This Quarterly Report contains, in addition to historical information, forward-looking statements which involve risks and uncertainties. The Company's actual results may differ significantly from the results discussed in forward-looking statements. Factors that may cause such a difference include those discussed in the material set forth in this document and in the discussion captioned "Risk Factors" in the Company's Annual Report on Form 10-K for the year ending December 31, 1998. History Of Losses; Future Profitability Uncertain. The Company has1999.

We have a history of operating losses and expectsmay not achieve profitability.

Our expenses have generally exceeded revenues. As of December 31, 1999, we had an accumulated deficit of approximately $79.2 million. We believe that our losses may increase because of the extensive resource commitments required to achieve regulatory approval and commercial success for any individual product. For example, over the next several years, we will incur substantial additional expenses over at least the next several years as it continueswe continue to develop itsand manufacture our potential products, to invest in new research areas and to devote significant resources to preclinical studies, clinical trialsimprove and manufacturing. As of September 30, 1999, the Company had an accumulated deficit of approximately $73.3 million. The time and resource commitment required to achieve market success for any individual product is extensive and uncertain. No assurance can be given that the Company, itsexpand our manufacturing capabilities. Since we or our collaborative partners or licensees willmay not be able to successfully develop additional products, obtain required regulatory approvals, manufacture products at an acceptable cost and with appropriate quality, or successfully market such products.products with desired margins, we may never achieve profitable operations. The Company's revenuesamount of net losses and the time required to date have consisted principally of research and development funding, licensing and signing fees, milestone payments and royalties from pharmaceutical and biotechnology companies under collaborative research and development, humanization, patent licensing and clinical supply agreements. These revenues may vary considerably from quarterreach sustained profitability are highly uncertain. We cannot assure you that we will be able to quarter and from year to year, and revenues in any period may not be predictive of revenues in any subsequent period, and variations may be significant depending on the terms of the particular agreements. Further, royalty revenues are unpredictable as they are dependent upon numerous factors, including the seasonality of sales of licensed products, the existence of competing products, the marketing efforts of the Company's licensees and rights certain licensees may have to partially offset certain previously paid milestones and third party royalties against royalties payable to the Company. In addition, expenses may fluctuate from quarter to quarter due to the timing of certain expenses, including milestone payments that may be payable by the Company under licensing arrangements. Although the Company anticipates entering into new collaborations from time to time, the Company presently does not know whetherachieve or not it will realize non-royalty revenue from its new and proposed collaborations at levels commensurate with the revenue historically recognized under its older collaborations. Moreover, the Company anticipates that it will incur significant operating expenses as the Company significantly increases its research and development, manufacturing, preclinical, clinical, marketing and administrative and patent activities. In particular, thesustain profitability.

Our commitment of resources to the development of Zenapax and the humanized anti-IL-4 antibody, two humanized antibodies with respect to which PDLwe recently obtained development rights, taken together with the continued development of the Company'sour existing products, will require significant additional funds for development. Accordingly,Our operating expenses may also increase as:

In the absence of substantial revenues from new corporate collaborations or patent licensing or humanization agreements, significant royalties on sales of products licensed under the Company'sour intellectual property rights, product sales or other uncertain sources which may or may not occur, the Company expects toof revenue, we will incur substantial operating losseslosses.

Our revenues, expenses and operating results will likely fluctuate in future periods.

Our revenues have varied in the foreseeable future as the Company undertakes development of Zenapax in autoimmune indicationspast and the humanized anti-IL-4 antibody, as certain of its earlier stage potential products move into later stage clinical development, as additional potential products are selected as clinical candidates for further development, as the Company invests in additional manufacturing capacity, as the Company defends or prosecutes its patentswill likely continue to fluctuate considerably from quarter to quarter and patent applications and as the Company invests in research or acquires additional technologies, product candidates or businesses. For example, revenues in the third quarter of 1999 included significant amounts from certain milestones and non-refundable, non-creditable licensing and signing fees. Moreover, expenses in the third quarter were also reduced by $1.1 million dueyear to year. As a favorable resolution of a contract dispute with a third party. Revenues in the fourth quarter of 1999 are not expected to include arrangements involving payments to the Company of a similar magnitude and certain of the milestone payments in the third quarter which are expected to be credited against royalties which otherwise would be due to the Company in the fourth quarter of 1999. In the absence of substantial non-recurring revenues or significant royalty revenues in any future period, there can be no assurance that the Company's level of revenue in any particular reporting period will be similar to or higher than that reported for the prior corresponding period. Hoffmann-La Roche Inc. and its affiliates ("Roche") have received regulatory approval to distribute Zenapax in the U.S. and certain other countries. Zenapax, a product created by the Company, is licensed exclusively to Roche. The Company has also entered into nonexclusive patent license agreements covering Synagis[R], a product developed by MedImmune, Inc., and Herceptin[R], a product developed by Genentech, Inc. The Company recognizes royalty revenues when royalty reports are received from its collaborative partners, including Roche. With respect to royalties based on revenue from sales of Zenapax by Roche, royalties based on U.S. sales are reported to the Company on a quarterly basis and royalties based on sales outside of the U.S. are currently reported on a semi-annual basis. With respect to royalties on sales of Synagis and Herceptin, royalty reports are due in the quarter following the quarter in which sales occur or are reported by sublicensees, as the case may be. Each of these licensees has certain rights to partially offset certain payments previously made to the Company or paid to third parties. For example, Roche has a right to partially offset certain third party royalties, patent reimbursement expenses and previously paid milestones against royalties payable to the Company with respect to Zenapax. The Company records revenue when reports are received from its licensees. This method of accounting for royalty revenues from the Company's licensees, taken together with the unpredictable timing of payments of non-recurring licensing and signing fees, payments for manufacturing services and milestones under new and existing collaborative, humanization, patent licensing and clinical supply agreements, is likely to result, in significant quarterly fluctuations in revenues in quarterly and annual periods. Thus,our revenues in any period may not be predictive of revenues in any subsequent period, and variationsperiod. Our royalty revenues may be significant dependingunpredictable and may fluctuate since they depend upon:

Other revenue may also be unpredictable and may fluctuate due to the timing of payments of non-recurring licensing and signing fees and payments for manufacturing services and achievement of milestones under new and existing collaborative, humanization, and patent licensing agreements. Revenue historically recognized under our prior agreements may not be an indicator of non-royalty revenue from any future collaborations.

In December 1999, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 101, "Revenue Recognition in Financial Statements" (SAB 101). We are evaluating the effects, if any, that the adoption of SAB 101 in the second quarter of 2000 may have on the termsresults of our operations or our financial position. We have been advised that the particular agreements. The amountSecurities and Exchange Commission intends to provide additional guidance during the second quarter of net losses2000 with respect to the implementation of SAB 101. It is currently unknown whether such guidance and the time requiredimplementation of SAB 101 will require us to reach sustained profitability are highly uncertain. To achieve sustained profitable operations,revise our revenue recognition practices or to restate revenues for the Company, alone or with its collaborative partners, must successfully discover, develop, manufacture, obtain regulatory approvals forfirst quarter of 2000.

In addition, our expenses may be unpredictable and market potential products. No assurances can be given that the Company will be able to achieve or sustain profitability, and results are expected tomay fluctuate from quarter to quarter due to the timing of expenses, which may include payments owed by us under licensing arrangements.

Our humanization patents are being opposed and yeara successful challenge could limit our future revenues.

PDL's two humanization patents issued by the European Patent Office (EPO) apply in the United Kingdom, Germany, France, Italy and eight other European countries. The EPO procedures provide for an opposition period in which other parties may submit arguments as to year. Dependence On Licensees With Respectwhy a patent was incorrectly granted and should be withdrawn or limited. Eighteen notices of opposition to Royalties.our first European patent were filed during the opposition period for the patent, including oppositions by major pharmaceutical and biotechnology companies. At an oral hearing in March 2000, the Opposition Division (OD) of the EPO decided to revoke the broad claims in our first European patent based on formal matters of European patent law, specifically that there had been an impermissible addition of subject matter after the filing of the original European patent application, but did not provide the rationale behind its decision. The Companydecision upheld claims that protect Zenapax. The OD did not otherwise announce a decision on the issue of whether the claims in our patent are inventive in light of the prior art or other issues of patentability. We plan to appeal the OD's decision to the Technical Board of Appeals at the EPO. The Technical Board of Appeals will consider all issues anew. The appeal suspends the decision of the OD during the appeals process, which is dependent uponlikely to take several years.

Until our appeal regarding our first European patent is resolved, we may be limited in our ability to collect royalties or to negotiate future licensing or collaborative research and development arrangements based on this and our other humanization patents. Moreover, if our appeal is unsuccessful, our ability to collect royalties on European sales of antibodies humanized by others would depend on the developmentscope and marketing effortsvalidity of its licenseesour second European patent, whether the antibodies are manufactured in a country outside of Europe where they are covered by one of our patents, and in that case the terms of our license agreements with respect to products forthat situation. Also, the OD's decision could encourage challenges of our related patents in other jurisdictions, including the U.S. The OD's decision may lead some of our licensees to stop making royalty payments or lead potential licensees not to take a license, which might result in us initiating formal legal actions to enforce our rights under our various humanization patents. In such a situation, a likely defensive strategy to our action would be to challenge our patents in that jurisdiction. During the Company may receive royalties. For example, in 1998,appeals process with respect to our first European patent, if we were to commence an infringement action to enforce that patent, such an action would likely be stayed until the Company began receiving royalties from sales of Zenapax, a product exclusively licensed to Roche. The Company's royalties on Zenapax sales in transplantation depend uponappeal is decided by the efforts of Roche and there can beEPO. We have no assurance that Roche's development, regulatorywe will successfully enforce our rights under our European or related U.S. and marketing effortsJapanese patents. The nine month opposition period for our second European antibody humanization patent ends in May 2000, and we expect that a significant number of notices of opposition will be successful, including without limitation, whether or how quickly Zenapax might receive regulatory approvalsfiled with respect to this patent. We have also been advised that three opposition statements have been filed with the Japanese Patent Office with respect to our humanization patent issued in various countries throughoutJapan in late 1998.

We intend to vigorously defend the worldEuropean patents and how rapidly it might be adopted by the medical community. Moreover, Simulect[R], a product competitive with Zenapax, is marketedJapanese patent in these proceedings; however, we may not prevail in the U.S.opposition proceedings or any litigation contesting the validity of these patents. If our appeal with respect to our first European patent is unsuccessful or if the outcome of the other European or Japanese opposition proceedings or any litigation involving our antibody humanization patents were to be unfavorable, our ability to collect royalties on existing licensed products and other countries and there canto license our patents relating to humanized antibodies may be no assurance that Roche will successfully market and sell Zenapax against this and other available competitive products.materially harmed. In addition, there can be no assurance thatthese proceedings or any other independently developed products of Roche, including CellCept[R],litigation to protect our intellectual property rights or defend against infringement claims by others, will not compete with or prevent Zenapax from achieving meaningful sales. Roche's development and marketing efforts for CellCept maycould result in delays or a relatively smaller resource commitment to marketingsubstantial costs and sales support efforts than might otherwise be obtained for Zenapax if this potentially competitive product were not under development or being marketed. In addition, the Company recently obtained exclusive rights to develop Zenapax in autoimmune indications. There can be no assurance that the Company's development efforts in autoimmune indications will show that Zenapax is safediversion of management's time and efficacious in this setting, or that the clinical trials will result in approval to market Zenapax in these indications. Any adverse event or announcement related to Zenapax would have a material adverse effect on theattention, which could materially harm our business and financial condition of the Company. The Company has also entered into non-exclusive patent licensing arrangements for Synagiscondition.

If we are unable to protect our patents and Herceptin. The Company is dependent upon the further development, regulatory and marketing efforts of its licensees with respectproprietary technology, we may not be able to these products and there can be no assurance that the development, regulatory and marketing efforts of these licensees will be successful, including, without limitation, if and when regulatory approvals in various countries may be obtained and whether or how quickly these products might be adopted by the medical community. Uncertainty Of Patents And Proprietary Technology; Opposition Proceedings. The Company'scompete successfully.

Our success isdepends significantly dependent on itsour ability to obtain and maintain patent protection for itsour products and technologies, and to preserve itsour trade secrets and to operate without infringing on the proprietary rights of third parties. The Company filesWhile we file and prosecutesprosecute patent applications to protect its inventions. No assurance can be given that the Company'sour inventions, our pending patent applications willmay not result in the issuance of valid patents or that anyour issued patents willmay not provide competitive advantages or will not be invalidated or circumvented by its competitors. Moreover, no assurance can be given that patents are not issued to, oradvantages. Also, our patent applications have not been filed by, other companies which would have an adverse effect on the Company's ability to use, import, manufacture, market or sell its products or maintain its competitive position with respect to its products. Other companies obtaining patents claiming products or processes useful to the Company may bring infringement actions against the Company. As a result, the Company may be required to obtain licenses from others or not be able to use, import, manufacture, market or sell its products. Such licensesprotection may not be available on commercially reasonable terms, if at all. Patents in the U.S. are issued to the party that is first to invent the claimed invention. Since patent applications in the U.S. are maintained in secrecy until patents issue, the Company cannot be certain that it was the first inventorprevent others from developing competitive products using related or other technology.

A number of the inventions covered by its pendingcompanies, universities and research institutions have filed patent applications or received patents in the areas of antibodies and other fields relating to our programs. Some of these applications or patents may be competitive with our applications or contain material that it wascould prevent the firstissuance of patents to file patent applications for such inventions. us or result in a significant reduction in the scope of our issued patents.

The patent positionsscope, enforceability and effective term of biotechnology firms generally arepatents issued to companies, universities and research institutions can be highly uncertain and often involve complex legal and factual questions. No consistent policy has emerged regarding the breadth of claims in biotechnology patents, and patents of biotechnology products are uncertain, so that even issued patents may later be modified or revoked by the U.S. Patent and Trademark Office ("PTO")relevant patent authorities or the courts. Moreover, the issuance of a patent in one country does not assure the issuance of a patent with similar claims in another country, and claim interpretation and infringement laws vary among countries, so we are unable to predict the extent of any patent protection may vary in different countries. The Company has a number

In addition to seeking the protection of patents and has exclusively licensed certain patents from third parties. In June 1996, the Company was issued a U.S.licenses, we also rely upon trade secrets, know-how and continuing technological innovation which we seek to protect, in part, by confidentiality agreements with employees, consultants, suppliers and licensees. If these agreements are not honored, we might not have adequate remedies for any breach. Additionally, our trade secrets might otherwise become known or patented by our competitors.

We may require additional patent covering Zenapax and certain related antibodies against the IL-2 receptor. The Company has been issued patents by the PTO, the Japanese Patent Office ("JPO"), European Patent Office ("EPO") and other patent offices around the world that relate to humanized antibodies and the methods of making those antibodies. With respect to its issued antibody humanization patents, the Company believes the patent claims cover Zenapax, Herceptin and Synagis and, based on its review of the scientific literature, most other humanized antibodies. In addition, the Company is currently prosecuting other patent applications with the PTO and in other countries, including members of the European Patent Convention, Canada, Japan and Australia. The patent applications are directed to various aspects of the Company's SMART and human antibodies, antibody technology and other programs, and include claims relating to compositions of matter, methods of preparation and use of a number of the Company's compounds. However, the Company does not know whether any pending applications will result in the issuance of patents or whether such patents will provide protection of commercial significance. Further, there can be no assurance that the Company's patents will prevent others from developing competitive products using related technology. The Company's two humanization patents issued by the EPO apply in the United Kingdom, Germany, France, Italy and eight other European countries. The EPO (but not PTO) procedures provide for an opposition period in which other parties submit arguments as to why the patent was incorrectly granted and should be withdrawn or limited. Eighteen notices of opposition to the Company's first European patent were filed during the opposition period for such patent, including oppositions by major pharmaceutical and biotechnology companies, which cited references and made arguments not considered by the EPO and PTO before grant of the respective patents. The Company submitted its response to the briefs filed by these parties and a preliminary view from the EPO was received in May 1999. The preliminary view represents the initial non-binding statement from the EPO with respect to the issued European patent and does not represent the final determination concerning the patent. Complex preliminary views are common in EPO proceedings, and are intended to set an agenda for discussion at the oral hearing. The final determination from the EPO is expected to occur at an oral hearing currently scheduled to take place in March 2000. At or following the oral hearing, the Company expects that the European patent will either be maintained in full, maintained in an amended version or revoked. Any of the parties to the opposition may appeal a decision to a board of appeals within the EPO. Such an appeal can take two or more years to be resolved. The preliminary view from the EPO raises significant questions regarding the validity of the first European patent, which, if not satisfactorily responded to by the Company in the oral hearing, could result in revocation of certain claims or the entire European patent. If the key claims in the European patent are revoked following the oral hearing and the Company's other humanization patents do not provide sufficient coverage of certain products licensed under the Company's patents, then the Company's ability to collect royalties on European sales of existing licensed products and to license its patents relating to humanized antibodies may be materially adversely affected, which would have a material adverse affect on the business and financial condition of the Company. The Company is currently reviewing the preliminary view with counsel in preparation for the scheduled oral hearing. Although the entire opposition process, including appeals, may take several years to complete, and although the European patent remains issued and any revocation of the European patent is suspended during the appeals process, the validity of the European patent will be at issue, which may limit the Company's ability to collect royalties or to negotiate future licensing or collaborative research and development arrangements based on this patent. In addition, the Company may need to initiate formal legal actions, if permissible,licenses in order to enforce its rights under its various humanization patents, including the European patent, and there can be no assurance that the Company will successfully enforce its rights under the Europeanmanufacture or similar U.S. and Japanese patents of the Company. The nine month opposition period for the Company's second European antibody humanization patent has recently begun and the Company expects that, depending upon the outcome of the opposition proceedings for the first European patent, a significant number of notices of opposition may be filed with respect to the second European patent. A similar opposition period in Japan has recently expired with respect to the Company's humanization patent issued in Japan in late 1998. Similar to the process in Europe, third parties had the opportunity to file their opposition to the issuance of the JPO patent. The Company has been advised that three opposition statements have been filed. The Company intends to vigorously defend the European patent and the Japanese patent and, if necessary, the U.S. patents; however, there can be no assurance that the Company will prevail in the opposition proceedings or any litigation contesting the validity or scope of these patents. If the outcome of the European or Japanese opposition proceeding or any litigation involving the Company's antibody humanization patents were to be unfavorable, the Company's ability to collect royalties on existing licensed products and to license its patents relating to humanized antibodies may be materially adversely affected, which could have a material adverse affect on the business and financial condition of the Company. In addition, such proceedings or litigation, or any other proceedings or litigation to protect the Company's intellectual property rights or defend against infringement claims by others, could result in substantial costs and diversion of management's time and attention, which could have a material adverse effect on the business and financial condition of the Company. A number ofsell our potential products.

Other companies, universities and research institutions have filed patent applicationsmay obtain patents that could limit our ability to use, import, manufacture, market or received patents in the areas of antibodies and other fields relating to the Company's programs. Some of these applications or patents may be competitive with the Company's applications or contain claims that conflict with those made under the Company's patent applications or patents. Such conflicts could prevent issuance of patents to the Company, provoke an interference with the Company's patents or result in a significant reduction in the scope or invalidation of the Company's patents, if issued. An interference is an administrative proceeding conducted by the PTO to determine the priority of invention and may determine questions of patentability. Moreover, if patents are held by or issued to other parties that contain claims relating to the Company'ssell our products or processes, and such claims are ultimately determinedimpair our competitive position. As a result, we might be required to be valid, no assurance can be given that the Company wouldobtain licenses from others before we could continue using, importing, manufacturing, marketing, or selling our products. We may not be able to obtain required licenses on terms acceptable to these patents at a reasonable cost,us, if at all,all. If we do not obtain required licenses, we may encounter significant delays in product development while we redesign potentially infringing products or methods or may not be able to develop or obtain alternative technology. The Company is aware that market our products at all.

Celltech Limited ("Celltech")Chiroscience plc has been granted a patent by the EPO covering certain humanized antibodies ("European(European Adair Patent")Patent), which the Company has opposed, and thatwe have opposed. Celltech has also been issued a corresponding U.S. patent (the "U.S.(U.S. Adair Patent")Patent) that contains claims that may be considered broader in scope than the European Adair Patent. If it were determined thatRecently, we entered into an agreement with Celltech providing each company with the Company'sright to obtain nonexclusive licenses for up to three antibody targets under the other company's humanization patents. Nevertheless, if our SMART antibodies were covered by the European or U.S. Adair Patents,Patent and if we were to need more than the Company mightthree licenses under those patents currently available to us under the agreement, we would be required to obtain a licensenegotiate additional licenses under suchthose patents or to significantly alter itsour processes or products, if necessary to make, use or sell its products in Europe and the U.S. There can be no assurance that the Company wouldproducts. We might not be able to successfully alter itsour processes or products to avoid infringing suchconflict with these patents or to obtain such a license from Celltechthe required additional licenses on commercially reasonable terms, if at all, and the failure to do so could have a material adverse effect on the business and financial condition of the Company. all.

In addition, if the claims of the U.S. Adair Patent or any related patent applications conflict with claims in the Company'sour U.S. patents or patent applications, there canwe may become involved in proceedings to determine which company was the first to invent the products or processes contained in the conflicting patents. These proceedings could be no assurance that an interference would not be declared by the PTO, which could takeexpensive, last several years to resolve and could involve significant expense to the Company. Also, such conflict couldeither prevent issuance of additional patents to the Companyus relating to humanization of antibodies or result in a significant reduction in the scope or invalidation of the Company's patents, if issued. Moreover, uncertainty as to the validity or scope of patents issued to the Company relating generally to humanization of antibodies may limit the Company'sour patents. Any limitation would reduce our ability to negotiate or collect royalties or to negotiate future collaborative research and development agreements based on these patents. The Company is aware that

Lonza Biologics, Inc. has a patent issued in Europe to which the Company doeswe do not have a license (although Roche haswe have been advised the Companyby Roche that it has a license covering Zenapax), which that may cover a process the Company usesthat we use to produce itsour potential products. If it were determined that the Company'sour processes were covered by suchthis patent, the Companywe might be required to obtain a license under suchthis patent or to significantly alter itsour processes or products if necessary to manufacture or import its products in Europe. There can be no assurance that the Company wouldWe might not be able to successfully alter itsour processes or products to avoid infringing suchconflict with this patent or to obtain such a license on commercially reasonable terms, if at all, and the failure toterms.

We do so couldnot have a material adverse effect on the business and financial condition of the Company. The Company is also aware oflicense to an issued U.S. patent assigned to Stanford University and Columbia University, to which the Company does not have a license, which may cover a process the Company useswe use to produce itsour potential products. The Company hasWe have been advised that an exclusive license has been previously granted to a third party under this patent. If it were determined that the Company'sour processes were covered by suchthis patent, the Companywe might be required to obtain a license under such patent or to significantly alter itsour processes or products, if necessary to manufacture or import its products in the U.S. There can be no assurance that the Company wouldWe might not be able to successfully alter itsour processes or products to avoid infringing suchconflict with this patent or to obtain such a license on commercially reasonable terms,acceptable terms. Moreover, if at all, andwe do not obtain the failure to do so could have a material adverse effect on the business and financial condition of the Company. Moreover,required licenses, any alteration of processes or products to avoid infringing theconflict with a competitive patent could result in a significant delay in our achieving regulatory approval with respect tofor the products affected by suchthese alterations. In addition

If we cannot successfully complete our clinical trials, we will be unable to seeking the protection of patents and licenses, the Company also relies upon trade secrets, know-how and continuing technological innovation which it seeksobtain regulatory approvals required to protect, in part, by confidentiality agreements with employees, consultants, suppliers and licensees. There can be no assurance that these agreements will not be breached, that the Company would have adequate remedies for any breach or that the Company's trade secrets will not otherwise become known, independently developed or patented by competitors. Uncertainty Of Clinical Trial Results. Before obtainingmarket our products.

To obtain regulatory approval for the commercial sale of any of itsour potential products the Companyor to promote these products for expanded indications, we must demonstrate through preclinical studiestesting and clinical trials that theeach product is safe and efficaciouseffective for use in the clinical indicationindications for which approval is sought. There canrequested. We have conducted only a limited number of clinical trials to date. We may not be no assurance that the Company will be permittedable to undertakesuccessfully commence and complete all of our planned clinical trials without significant additional resources and expertise. Our potential inability to commence or continue clinical trials, for any of its potential products or, if permitted, that such products will be demonstrated to be safe and efficacious. Moreover,complete the results from preclinical studies and early-stage clinical trials may not be predictive of results that will be obtained in late-stage clinical trials. Thus, there can be no assurance that the Company's presenton a timely basis or future clinical trials willto demonstrate the safety and efficacy of anyour potential products, or will result infurther adds to the uncertainty of regulatory approval to marketfor our potential products. In advanced clinical development, numerous factors may be involved that may lead to different results in larger, late-stage clinical trials from those obtained in early-stage trials. For example, early-stage clinical trials usually involve a small number of patients, often at a single center,

Larger and thus may not accurately predict the actual results regarding safety and efficacy that may be demonstrated with a large number of patients in a late-later stage multi-center clinical trial. Also, differences in the clinical trial design between early-stage and late-stage clinical trials may cause different results regarding the safety and efficacy of a product to be obtained. In addition, many early-stage trials are unblinded and based on qualitative evaluations by clinicians involved in the performance of the trial, whereas late-stage trials are generally required to be blinded in order to provide more objective data for assessing the safety and efficacy of the product. Moreover, preliminary results from clinical trials may not be representativeproduce the same results as early stage trials. Many companies in the pharmaceutical and biotechnology industries, including PDL, have suffered significant setbacks in clinical trials, including advanced clinical trials, even after promising results had been obtained in earlier trials.

Research, preclinical testing and clinical trials may take many years to complete and the time required can vary depending on the indication being addressed and the nature of results that may be obtained as the trial proceeds to completion. The Companyproduct. We may at times elect to aggressively enteruse aggressive clinical strategies in order to advance potential products into Phase I/II trials to determine preliminary safety and efficacy in specific indications. In addition, in certain cases the Company has commencedthrough clinical development as rapidly as possible. For example, we may commence clinical trials without conducting preclinical animal testing, where an appropriate animal testing model does not exist. Similarly, the Companyexist, or its partners at times willwe may conduct potentially pivotal Phase II/III or Phase IIIlater stage trials based on limited Phase I or Phase I/IIearly stage data. As a result, of these and other factors, the Company anticipateswe anticipate that only some of itsour potential products willmay show safety and efficacy in clinical trials and that the number of products that fail to show safety and efficacysome may be significant.encounter difficulties or delays during clinical development.

For example, the Company haswe have entered the SMART M195 Antibody into a Phase III clinical trial in acute myelogenous leukemia with a clinical regimen that has not been tested previously with this antibody. Results from the Company'sour prior Phase II and Phase II/III studies showed only a limited number of complete and partial remissions. In addition, thewe initiated a Phase III study was initiated by the Company without a meeting with the FDA or European regulatory authorities to discuss the protocol and its adequacy to support registrationapproval of the SMART M195 Antibody. The Company believesWe believe that itsour Phase III program is reasonable in view of the nature and severity of the disease. However, there can be no assuranceWe cannot assure you that the study will be successful or that the FDA or European regulatory authorities will agree that the study will be adequate to obtain regulatory approval, even if the study is successful. Limited Experience With Clinical Trials; Risk Of Delay. The Company has conducted onlyIn addition, the protocol for our Phase III trial includes an interim review by an independent data safety monitoring board. It is possible that the trial could be terminated upon such a limited numberreview if the interim data do not show a sufficient probability of the trial being successful or if specified safety criteria are not met.

As a second example, the FDA recently placed a clinical hold on clinical trials of our SMART Anti-CD3 Antibody for kidney transplant indications due to date. There can be no assurancetheir belief that we have not supplied adequate data from our prior trials to support our proposed dosage modifications to the CompanyPhase II study for prevention of kidney transplant rejection. Although our clinical trials of this antibody in other indications, such as psoriasis, are not affected by this hold, our clinical studies of this potential product for prevention or treatment of kidney transplant rejection will be abledelayed in the U.S. until we supply sufficient data to successfully commencethe FDA to justify our desired clinical study designs. Also, we may be required to further modify our clinical study designs to comply with FDA requirements and complete all of its planned clinicalpossibly to conduct additional Phase I trials without significant additional resources and expertise. In addition,before proceeding with Phase II trials. Accordingly, there can be no assurance that the Companywe will meet its contemplatedbe able, or will choose, to proceed with development scheduleof this antibody for any of its potential products. The inabilityeither or both of the Company or its collaborative partnerstransplant indications.

We may be unable to commence or continue clinical trials as currently planned,enroll sufficient patients to complete theour clinical trials on a timely basis or to demonstrate the safety and efficacy of its potential products, would have a material adverse effect on the business and financial condition of the Company.trials.

The rate of completion of the Company's or its collaborators'our clinical trials, and those of our collaborators, is significantly dependent upon among other factors, the rate of patient enrollment. Patient enrollment is a function of many factors, including, among others, including:

We may have difficulty obtaining sufficient patient enrollment or clinician support to conduct our clinical trials as planned, and we may result in increased costs and expenses in completion of the trial or may require the Companyhave to undertakeexpend substantial additional studies in orderfunds to obtain regulatory approval if the applicable standard of care changes in the therapeutic indication under study.access to resources or delay or modify our plans significantly. These considerations may lead the Companyus to consider the termination of ongoing clinical trials or halting further development of a product for a particular indication. Dependence On Collaborative Partners.

We may be unable to obtain or maintain regulatory approval for our products.

The Company hasmanufacturing, testing and marketing of our products are subject to regulation by numerous governmental authorities in the U.S. and other countries. In the U.S., pharmaceutical products are subject to rigorous FDA regulation. Additionally, other federal, state and local regulations govern the manufacture, testing, clinical and nonclinical studies to assess safety and efficacy, approval, advertising and promotion of pharmaceutical products. The process of obtaining approval for a new pharmaceutical product or for additional therapeutic indications within this regulatory framework requires a number of years and the expenditure of substantial resources. Companies in the pharmaceutical and biotechnology industries, including us, have suffered significant setbacks in various stages of clinical trials, even in advanced clinical trials after promising results had been obtained in earlier trials.

In addition to the requirement for FDA approval of each pharmaceutical product, each pharmaceutical product manufacturing facility must be registered with, and approved by, the FDA. The manufacturing and quality control procedures must conform to rigorous guidelines in order to receive FDA approval. Pharmaceutical product manufacturing establishments are subject to inspections by the FDA and local authorities as well as inspections by authorities of other countries. To supply pharmaceutical products for use in the U.S., foreign manufacturing establishments must comply with these FDA approved guidelines. These foreign manufacturing establishments are subject to periodic inspection by the FDA or by corresponding regulatory agencies in these countries under reciprocal agreements with the FDA. Moreover, pharmaceutical product manufacturing facilities may also be regulated by state, local and other authorities.

For the marketing of pharmaceutical products outside the U.S., we and our collaborative partners are subject to foreign regulatory requirements and, if the particular product is manufactured in the U.S., FDA and other U.S. export provisions. Requirements relating to the manufacturing, conduct of clinical trials, product licensing, promotion, pricing and reimbursement vary widely in different countries. Difficulties or unanticipated costs or price controls may be encountered by us or our licensees or marketing partners in our respective efforts to secure necessary governmental approvals. This could delay or prevent us or our licensees or our marketing partners from marketing potential pharmaceutical products.

Both before and after approval is obtained, a pharmaceutical product, its manufacturer and the holder of the Biologics License Application (BLA) for the pharmaceutical product are subject to comprehensive regulatory oversight. The FDA may deny a BLA if applicable regulatory criteria are not satisfied. Moreover, even if regulatory approval is granted, such approval may be subject to limitations on the indicated uses for which the pharmaceutical product may be marketed. Further, marketing approvals may be withdrawn if compliance with regulatory standards is not maintained or if problems with the pharmaceutical product occur following approval. In addition, under a BLA, the manufacturer continues to be subject to facility inspection and the applicant must assume responsibility for compliance with applicable pharmaceutical product and establishment standards. Violations of regulatory requirements at any stage may result in various adverse consequences, which may include, among other adverse actions, withdrawal of the previously approved pharmaceutical product or marketing approvals and/or the imposition of criminal penalties against the manufacturer and/or BLA holder.

Our revenues from licensed technologies depend on the efforts and successes of our licensees.

In those instances where we have licensed rights to our technologies, the product development and marketing efforts and successes of our licensees will determine the amount and timing of royalties we may receive, if any. We have no assurance that any licensee will successfully complete the product development, regulatory and marketing efforts required to sell products. The success of products sold by licensees, such as Roche, will be affected by competitive products, including potential competing therapies that are marketed by the licensee or others.

If our collaborations are not successful, we may not be able to effectively develop and market some of our products.

We have collaborative agreements with several pharmaceutical orand other companies to develop, manufacture and market certainZenapax and some of our potential products. The Company granted its collaborative partners certain exclusive rights to commercialize the products covered by these collaborative agreements. In some cases, the Company iswe are relying on itsour collaborative partners to manufacture such products, to conduct clinical trials, to compile and analyze the data received from suchthese trials, to obtain regulatory approvals and, if approved, to manufacture and market these licensed products. As a result, the Company often haswe may have little or no control over the manufacturing, development and marketing of these potential products and little or no opportunity to review clinical data prior to or following public announcement. The Company's

Our collaborative research agreements arecan generally terminablebe terminated by itsour partners on short notice. SuspensionA collaborator may terminate its agreement with us or terminationseparately pursue alternative products, therapeutic approaches or technologies as a means of certain ofdeveloping treatments for the Company's currentdiseases targeted by us or our collaborative research agreements could haveeffort. Even if a material adverse effect oncollaborator continues its contributions to the Company's operations and could significantly delayarrangement, it may nevertheless determine not to actively pursue the development or commercialization of the affectedany resulting products. In these circumstances, our ability to pursue potential products could be severely limited.

Continued funding and participation by collaborative partners will depend on the timely achievement of our research and development objectives, by the Company, the retention of key personnel performing work under those agreements and the successful achievement of research or clinical trial goals, none of which can be assured, as well as on each collaborative partner's own financial, competitive, marketing and strategic considerations. Such considerations include, among other things,include: the commitment of management of the collaborative partners to the continued development of the licensed products or technology the relationships among the individuals responsible for the implementation and maintenance of the collaborative efforts, and the relative advantages of alternative products or technology being marketed or developed by the collaborators or by others, including their relative patent and proprietary technology positions, and their ability to manufacture potential products successfully. The Company's

Our ability to enter into new collaborations and the willingness of the Company'sour existing collaborators to continue development of the Company'sour potential products depends upon, among other things, the Company'sour patent position with respect to such products. In this regard, the Company has been issuedIf we are unable to successfully maintain our patents by PTO, EPO and JPO with claims that the Company believes, based on its survey of the scientific literature, cover most humanized antibodies. The Company has also been allowed patents with similar claims in other countries and has applied for similar patents in certain other countries. See "Risk Factors -- Uncertainty of Patents and Proprietary Technology; Opposition Proceedings." The EPO and JPO patents are currently in the opposition proceeding stages in those patent offices. In addition, all of the Company's antibody humanization patentswe may be further challenged through administrative or judicial proceedings. The Company has entered into several collaborations related to both the humanization and patent licensing of certain antibodies whereby it granted licenses to its patent rights relating to such antibodies, and the Company anticipates entering into additional collaborations and patent licensing agreements partially as a result of the Company's patent and patent applications with respect to humanized antibodies. As a result, the inability of the Company to successfully defend the opposition proceedings before the EPO or JPO or, if necessary, to defend patents granted by the PTO, EPO or JPO or to successfully prosecute the corresponding patent applications in other countries could adversely affect the ability of the Companyunable to collect royalties on existing licensed products andor enter into additional collaborations humanization or patent licensing agreements and could therefore have a material adverse effect on the Company's business or financial condition. No Sales And Marketing Experience; Further Developmentagreements.

Our lack of Zenapax. The Company intendsexperience in sales, marketing and distribution may hamper market introduction and acceptance of our products.

We intend to market and sell certaina number of itsour products if successfully developed and approved, either directly or through sales and marketing partnership arrangements with collaborative partners. Although the Company does not expect to establish a direct sales capability at this time, the Company has no history or experience in sales, marketing or distribution. To market products directly, the Companywe must either establish a more extensive marketing group and direct sales force or obtain the assistance of another company. There can be no assurance that the Company willWe may not be able to establish marketing, sales and distribution capabilities or succeed in gaining market acceptance for itsour products. If the Company enterswe were to enter into co- promotionco-promotion or other marketing or patent licensing arrangements with pharmaceutical or biotechnology companies, the Company'sour revenues willwould be subject to the payment provisions of suchthese arrangements and dependent on the efforts of third parties. The Company has recently obtained rights from Roche to conduct development activities for Zenapax in autoimmune indications. The Company has no experience in conducting development activities for products that are currently approved and marketed for use in other indications such as Zenapax. U.S. Food and Drug Administration ("FDA") regulations prohibit promotion

Manufacturing difficulties could delay commercialization of the use of Zenapax for unapproved indications until appropriate clinical studies are conducted and the data from those studies is presented for the FDA to review and approve. There can be no assurance that the Company will be able to successfully develop Zenapax in autoimmune indications and substantial investment by the Company in such development may be required with no assurance that such efforts will be successful. Even if such development efforts succeed, there can be no assurance that the Company, by itself or with a collaborative partner, will successfully market, promote and detail Zenapax in those countries where PDL has or obtains such rights. The inability of the Company, Roche or its other collaborators to develop, market and sell Zenapax could have a material adverse effect on the business and financial condition of the Company. Absence Of Manufacturing Experience.our products.

Of the products which arethat we currently have in clinical development, by the Company, Roche is responsible for manufacturing Zenapax, SmithklineSmithKline Beecham is responsible for manufacturing the humanized anti-IL-4 antibody and BioNetScil is responsible for manufacturing the SMART Anti-L-Selectin Antibody. The Company isWe are responsible for manufacturing the Company'sour other products for itsour own development. The Company currently leases approximately 47,000 square feet housing its manufacturing facilities in Plymouth, Minnesota. The Company intendsWe intend to continue to manufacture potential products for use in preclinical and clinical trials using thisour manufacturing facility in accordance with standard procedures that comply with current Good Manufacturing Practices ("cGMP") and appropriate regulatory standards. The manufacture of sufficient quantities of antibody products in accordancethat comply with suchthese standards is an expensive, time-consuming and complex process and is subject to a number of risks that could result in delays. For example, the Company haswe and our collaborative partners have experienced some difficulties in the past in manufacturing certain potential products on a consistent basis. Productiondifficulties. Product supply interruptions if they occur, could significantly delay clinical development of our potential products, reduce third party or clinical researcher interest and support of proposed clinical trials, and possibly delay commercialization and sales of suchthese products. Manufacturing difficulties can even interrupt the supply of marketed products, thereby reducing revenues and risking loss of market share. For example, Roche has received a warning letter from the FDA regarding deficiencies in the manufacture of various products. Although the letter primarily related to products other than Zenapax, at least two deviations in the manufacture of Zenapax were noted. If Roche were not able to correct these and any other deficiencies in the manufacture of Zenapax in a timely manner, Zenapax supplies could be interrupted, which could cause a delay or termination of our clinical trials of Zenapax in autoimmune disease and could force Roche to withdraw Zenapax from the market temporarily or permanently, resulting in loss of revenue to us. These occurrences could materially impair theirour competitive position, which wouldposition.

We do not have a material adverse effect on the business and financial condition of the Company. The Company has no experience in manufacturing commercial quantities of itsour potential products, andnor do we currently does not have sufficient capacity to manufacture all of itsour potential products on a commercial scale. In order to obtain regulatory approvals and to create capacity to produce itsour products for commercial sale at an acceptable cost, the Companywe will need to improve and expand itsour existing manufacturing capabilities, including demonstration to the FDA and corresponding foreign authorities of its ability to manufacture its products using controlled, reproducible processes. The Company has approvedcapabilities. We are reviewing plans to improveexpand our manufacturing capacity, including possible acquisition and expand the capacityconversion of its currentan existing building into a manufacturing facility. Suchplant. If we implement these plans if fully implemented,we will result inincur substantial costs to the Company. There can be no assurance thatcosts. Any construction delays will not occur, and any such delays could impair the Company'sour ability to produce adequate supplies of itsour potential products for clinical use or commercial sale on a timely basis. Further, there canwe may be no assurance that the Company will successfullyunable to improve and expand itsour manufacturing capability sufficiently to obtain necessary regulatory approvals and to produce adequate commercial supplies of itsour potential products on a timely basis. Failure to do so could delay commercialization of suchthese products and could impair theirour competitive position, which could have a material adverse effect on the businessposition.

Manufacturing changes may result in delays in obtaining regulatory approval or financial condition of the Company. Uncertainties Resulting From Manufacturing Changes.marketing for our products.

Manufacturing of antibodies for use as therapeutics in compliance with regulatory requirements is complex, time-consuming and expensive. When certainIf we make changes are made in the manufacturing process, it is necessarywe may be required to demonstrate to the FDA and corresponding foreign authorities that the changes have not caused the resulting drug material to differ significantly from the drug material previously produced,produced. This is particularly important if we want to rely on results of prior preclinical studies and clinical trials performed using the previously produced drug material are to be relied upon in regulatory filings. Such changes could include, for example, changing the cell line used to produce the antibody, changing the fermentation or purification process or moving the production process to a new manufacturing plant.material. Depending upon the type and degree of differences between the newer and older drug material, variouswe may be required to conduct additional animal studies could be requiredor human clinical trials to demonstrate that the newly produced drug material is sufficiently similar to the previously produced drug material, possibly requiring additional animal studies or human clinical trials. Manufacturingmaterial. We have made manufacturing changes have been made orand are likely to be mademake additional manufacturing changes for the production of the Company'sour products currently in clinical development, in particularsuch as the SMART M195 and SMART Anti-CD3 Antibodies. There can be no assurance that suchThese manufacturing changes will notcould result in delays in development or regulatory approvals or if occurring after regulatory approval, in reduction or interruption of commercial sales. In addition, manufacturing changes to its manufacturing facility may require the Company to shut down production for a period of time. There can be no assurance that the Company will be able to reinitiate production in a timely manner, if at all, following such shutdown. Delays as a result of manufacturing changes or shutdown of the manufacturing facility could have an adverse effect on the competitive position of those productssales and could have a material adverse effect on theimpair our competitive position.

Our business and financial conditionmay be harmed if we cannot obtain sufficient quantities of the Company. Dependence On Suppliers. The Company is dependentraw materials.

We depend on outside vendors for the supply of raw materials used to produce itsour product candidates. The Company currently qualifies only one or a few vendors for its source of certain raw materials. Therefore, onceOnce a supplier's materials have been selected for use in the Company'sour manufacturing process, the supplier in effect becomes a sole or limited source of suchthat raw material due to regulatory compliance procedures. If the third party suppliers were to cease production or otherwise fail to supply us with quality raw materials and we were unable to the Company due to the extensive regulatory compliance procedures governing changes in manufacturing processes. Although the Company believes it could qualifycontract on acceptable terms for these services with alternative suppliers, there can be no assurance that the Company would not experience a disruption in manufacturing if it experienced a disruption in supply from any of these sources. Any significant interruption in the supply of any of the raw materials currently obtained from such sources, or the timeour ability to produce our products and expense necessary to transition a replacement supplier's product into the Company's manufacturing process, could disrupt the Company's operationsconduct preclinical testing and have a material adverse effect on the business and financial condition of the Company. A problem or suspected problem with the quality of raw materials supplied could result in a suspension of clinical trials notification of patients treated with products or product candidates produced using such materials, potential product liability claims, a recall of products or product candidates produced using such materials, and an interruption of supplies, any of whichwould be adversely affected. This could have a material adverse effect on the business or financial condition of the Company. Competition; Rapid Technological Change. The Company's potential products are intended to address a wide variety of disease conditions, including autoimmune diseases, inflammatory conditions and cancers. Competition with respect to these disease conditions is intense and is expected to increase. This competition involves, among other things, successful research and development efforts, obtaining appropriate regulatory approvals, establishing and defending intellectual property rights, successful product manufacturing, marketing, distribution, market and physician acceptance, patient compliance, price and potentially securing eligibility for reimbursement or payment for the use of the Company's products. The Company believes its most significant competitorsimpair our competitive position.

Our revenue may be fully integrated pharmaceutical companies with substantial expertise in researchadversely affected by competition and development, manufacturing, testing, obtaining regulatory approvals, marketing and securing eligibility for reimbursement or payment, and substantially greater financial and other resources than the Company. Smaller companies also may prove to be significant competitors, particularly through collaborative arrangements with large pharmaceutical companies. Furthermore, academic institutions, governmental agencies and other public and private research organizations conduct research, seek patent protection, and establish collaborative arrangements for product development, clinical development and marketing. These companies and institutions also compete with the Company in recruiting and retaining highly qualified personnel. The biotechnology and pharmaceutical industries are subject to rapid and substantial technological change. The Company's competitors may develop and introduce other technologies or approaches to accomplishing the intended purposes of the Company's products which may render the Company's technologies and products noncompetitive and obsolete. In addition to currently marketed competitive drugs, the Company is aware of potential products in research or development by its competitors that address all of the diseases being targeted by the Company. These and other products may compete directly with the potential products being developed by the Company. In this regard, the Company is

We are aware that potential competitors have developed and are developing human and humanized antibodies or other compounds for treating autoimmune diseases, transplantation, inflammatory conditions and cancers. In particular, a number of other companies have developed and will continue to develop human and humanized antibodies. In addition, protein design is being actively pursued at a number of academic and commercial organizations are actively pursuing similar technologies, and several companies have developed or may develop technologies that canmay compete with the Company'sour SMART and human antibody technologies. In particular, the Company believes that certain companies that use alternative technologies to produce human-like antibodies have recently entered into collaborative arrangements that are competitive with andtechnology. Competitors may negatively impact the Company's efforts to enter into humanization and development arrangements for early stage antibody research and development. There can be no assurance that competitors will not succeed in more rapidly developing and marketing technologies and products that are more effective than theour products being developed by the Company or that would render the Company'sour products or technology obsolete or noncompetitive. Further, there can be no assurance that the Company'sOur collaborative partners will notmay also independently develop products that are competitive with thoseproducts that we have licensed to such partners by the Company, thereby reducing the likelihood that the Company will receivethem. This could reduce our revenues under itsour agreements with suchthese partners.

Any potential product that the Companywe or itsour collaborative partners succeed in developing and for which regulatory approval is obtained must then compete for market acceptance and market share. For certain of the Company's potential products, an important factor will be the timing of market introduction of competitive products. Accordingly, theThe relative speed with which the Companywe and itsour collaborative partners can develop products, complete the clinical testing and approval processes, and supply commercial quantities of the products to the market compared to competitive companies is expected to be an important determinant ofwill affect market success. For example, Novartis, has received approval to market Simulect, a product competitive with Zenapax, in the U.S. and Europe. In addition to an earlier launch in Europe, Novartiswhich has a significant marketing and sales force directed to the transplantation market, has received approval to market Simulect[R], a product competitive with Zenapax, in the U.S. and there can be no assurance thatEurope. Since Novartis launched Simulect in the European Union earlier than Roche, will successfullyZenapax may have a smaller market and sell Zenapax against thisshare than Simulect and other available products.

Other competitive factors include include:

If we do not attract and retain key employees, our business could have a material adverse effect on the business and financial condition of the Company. Dependence on Key Personnel. The Company's success is dependent to a significant degree on its key management personnel. be impaired.

To be successful, the Companywe will have to retain itsour qualified clinical, manufacturing, scientific and management personnel. The Company facesBecause we are located in a high technology area, we face competition for personnel from other companies, academic institutions, government entities and other organizations. There can be no assurance that the Company will be successfulWe are currently conducting a search for a chief financial officer and a vice president of marketing, as well as other senior management personnel. If we are unsuccessful in hiringfilling these positions or retaining qualified personnel, our business could be impaired.

We may be subject to product liability claims, and its failureour insurance coverage may not be adequate to do socover these claims.

We face an inherent business risk of exposure to product liability claims in the event that the use of products during research and development efforts or after commercialization results in adverse effects. This risk will exist even with respect to any products that receive regulatory approval for commercial sale. While we have obtained liability insurance for our products, it may not be sufficient to satisfy any liability that may arise. Also, adequate insurance coverage may not be available in the future at acceptable cost, if at all.

We may require additional funds that may be difficult to obtain in order to continue our business activities as planned.

Our operations to date have consumed substantial amounts of cash. We will be required to spend substantial funds in conducting clinical trials, to expand our marketing capabilities and efforts, to expand existing research and development programs, to develop and expand our development and manufacturing capabilities and to defend or prosecute our patents and patent applications.

In order to develop and commercialize our products, we may need to raise substantial additional funds through equity or debt financings, collaborative arrangements, the use of sponsored research efforts or other means. Additional financing may not be available on acceptable terms, if at all, and may only be available on terms dilutive to existing stockholders or that would increase the amount of our indebtedness. Our inability to secure adequate funds on a timely basis could haveresult in the delay or cancellation of programs that we might otherwise pursue.

We may incur significant costs in order to comply with environmental regulations or to defend claims arising from accidents involving the use of hazardous materials.

We are subject to federal, state and local laws and regulations governing the use, discharge, handling and disposal of materials and wastes used in our operations. As a materialresult, we may be required to incur significant costs to comply with these laws and regulations. We cannot eliminate the risk of accidental contamination or injury from these materials. In the event of such an accident, we could be held liable for any resulting damages and incur liabilities which exceed our resources. In addition, we cannot predict the extent of the adverse effect on our business or the businessfinancial and financial conditionother costs that might result from any new government requirements arising out of future legislative, administrative or judicial actions.

Changes in the Company. Potential Volatility Of Stock Price. U.S. and international health care industry could adversely affect our revenues.

The marketU.S. and international health care industry is subject to changing political, economic and regulatory influences that may significantly affect the purchasing practices and pricing of pharmaceuticals. Cost containment measures, whether instituted by health care providers or imposed by government health administration regulators or new regulations, could result in greater selectivity in the purchase of drugs. As a result, third-party payors may challenge the price and cost effectiveness of our products. In addition, in many major markets outside the U.S., pricing approval is required before sales can commence. As a result, significant uncertainty exists as to the reimbursement status of approved health care products. We may not be able to obtain or maintain our desired price for our products. Our products may not be considered cost effective relative to alternative therapies. As a result, adequate third-party reimbursement may not be available to enable us to maintain prices sufficient to realize an appropriate return on our investment in product development. Also, the Company's securitiestrend towards managed health care in the U.S. and the concurrent growth of organizations such as health maintenance organizations, as well as legislative proposals to reform health care or reduce government insurance programs, may all result in lower prices, reduced reimbursement levels and diminished markets for our products. These factors will also affect the products that are marketed by our collaborative partners.

Our common stock price is volatile and an investment in these securities involves substantial risk. The marketour company could decline in value.

Market prices for securities of biotechnology companies (including the Company)PDL) have been highly volatile andso that investment in our securities involves substantial risk. Additionally, the stock market from time to time has experienced significant price and volume fluctuations that may be unrelated to the operating performance of particular companies. Factors suchThe following are some of the factors that may have a significant effect on the market price of our common stock:

If any of these factors causes us to fail to meet the expectations of securities analysts or investors. In such event,investors, or in the event thatif adverse conditions prevail or are perceived to prevail with respect to the Company'sour business, the price of the Company's common stock would likely drop significantly. With respect to the possible sale of the Company's common stock held by collaborative partners, Roche acquired 1,682,877 shares of the Company's common stock held by Corange Limited which are no longer subject to the contractual limitations on disposition other than certain restrictions on transfers ofA significant blocks of stock. In the past, following significant dropsdrop in the price of a company's common stock often leads to the filing of securities class action litigation has often been instituted against such athe company. SuchThis type of litigation against the Companyus could result in substantial costs and a diversion of management's attention and resources, which would have a material adverse effect on the Company's business and financial condition. resources.

ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

(a) Exhibits Exhibit 10.46 Agreement of Purchase and Sale between Fremont Holding L.L.C., a Delaware limited liability company, as assignee effective September 13, 1999, and Ardenstone LLC, a Delaware limited liability company, effective June 21, 1999. Exhibit 10.47 Promissory Note between Fremont Holding L.L.C., a Delaware limited liability company and Wells Fargo Bank, National Association, dated September 9, 1999. Exhibit 10.48 Deed of Trust and Absolute Assignment of Rents and Security Agreement (Fixture Filings) between Fremont Holding L.L.C., a Delaware limited liability company and Wells Fargo Bank, National Association, dated September 9, 1999. Exhibit 10.49 Patent Rights Agreement between the Company and Smithkline Beecham Corporation, effective as of September 28, 1999 (with certain confidential portions deleted and marked by notation indicating such deletion). Exhibit 10.50 IL-5 Patent License Agreement between the Company and Smithkline Beecham Corporation, effective as of September 28, 1999 (with certain confidential portions deleted and marked by notation indicating such deletion). Exhibit 10.51 Development and License Agreement between the Company and Smithkline Beecham Corporation, effective as of September 28, 1999 (with certain confidential portions deleted and marked by notation indicating such deletion). Exhibit 10.52 Amended and Restated Agreement between the Company and Hoffmann-La Roche Inc. and F. Hoffmann-La Roche Ltd, dated as of October 20, 1999 (with certain confidential portions deleted and marked by notation indicating such deletion). Exhibit 10.53 Amended and Restated Agreement between the Company and F. Hoffmann-La Roche Ltd, dated as of October 20, 1999 (with certain confidential portions deleted and marked by notation indicating such deletion). Exhibit 21.1 Fremont Holding L.L.C., a Delaware limited liability company. Fremont Management, Inc., a Delaware corporation, doing business in California as Delaware Fremont Management.

Exhibit Number Description
  3.1 Amended and Restated Bylaws
  27.1 Financial Data Schedule

(b) No Reports on Form 8-K were

     The Company filed duringa Current Report on Form 8-K on February 14, 2000 (SEC File No. 000-19756) announcing:

     Preliminary financial results for the quarter and year ended June 30,December 31, 1999. SIGNATURE

     The Company's intention to make a private offering of $100 million of Convertible Subordinated Notes, due 2007, with an option to issue an additional      $25 million of notes.

     The Company was delaying the pricing of its private offering of Convertible Subordinated Notes in order to provide time to complete quality control      testing of a new lot of an antibody product.

     The Company had been advised that an independent regulatory consultant had approved the report of additional quality tests for the lot of antibody      product.

     The private placement of $125 million principal amount of 5.5% Convertible Subordinated Notes due 2007, and the granting to the initial purchasers an      option to purchase up to an additional $25 million in principal amount of notes.

     The Company filed a Current Report on Form 8-K on March 1, 2000 (SEC File No. 000-19756) announcing the completion of the offering of      Convertible Subordinated Notes on February 15, 2000.








PROTEIN DESIGN LABS, INC.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its be half by the undersigned thereunto duly authorized.

  PROTEIN DESIGN LABS, INC.
 (Registrant)
Dated: November 15, 1999 PROTEIN DESIGN LABS, INC. (Registrant) /s/Laurence Jay Korn Chief Executive Officer,May 11, 2000

 By:  /s/Laurence Jay Korn
 
  Laurence Jay Korn
  Chairperson of the Board of Directors
  (Principal Executive Officer)

 By:  /s/Robert Kirkman
 
  Robert Kirkman
  Vice President Corporate Communications and Business Development
  (Principal Accounting Officer)