SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

       (Mark One)

       [X]    Quarterly report pursuant to Section 13 or 15(d) of the Securities
              Exchange Act of 1934

       For the Quarterly Period Ended March 31, 1999

                                       OR

       [ ]    Transition report pursuant to Section 13 or 15(d) of the
              Securities Exchange Act of 1934

                         Commission File Number: 0-19756

                            PROTEIN DESIGN LABS, INC.
             (Exact name of registrant as specified in its charter)

                   Delaware                               94-3023969
        (State or other jurisdiction of                (I.R.S. Employer
        incorporation or organization)              Identification Number)


                               34801 Campus Drive
                               Fremont, Ca. 94555
                    (Address of principal executive offices)
                         Telephone Number (510) 574-1400

       Indicate by check mark whether the registrant (1) has filed all reports
       required to be filed by Section 13 or 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:

                          Yes [X]              No [ ]


     As of March 31, 1999, there were 18,618,825 shares of the Registrant's
     Common Stock outstanding.










PROTEIN DESIGN LABS, INC.


INDEX


PART I. FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS   

Statements of Operations
Three months ended March 31, 1999 and 1998       

Balance Sheets
March 31, 1999 and December 31, 1998    

Statements of Cash Flows
Three months ended March 31, 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 ON FORM 8-K       

Signatures              





















                          PART I. FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS
                            PROTEIN DESIGN LABS, INC.
                            STATEMENTS OF OPERATIONS
(In thousands, except net loss per share data)
                                   (unaudited)


                                     Three Months Ended
                                           March 31,
                                    ---------------------
                                        1999       1998
                                    ---------- ----------
                                               
Revenues:

  Revenue under agreements
   with third parties                  $6,462     $1,791
  Interest and other income             2,373      2,444 
                                    ---------- ----------
    Total revenues                      8,835      4,235
                                    ---------- ----------
Costs and expenses:
  Research and development              8,280      6,406
  General and administrative            2,445      1,842
                                    ---------- ----------
    Total costs and expenses           10,725      8,248
                                    ---------- ----------
Net loss                              ($1,890)   ($4,013)
                                    ========== ==========
Net loss per share:
  Basic                                ($0.10)    ($0.22)
  Diluted                              ($0.10)    ($0.22)
                                    ========== ==========
Weighted average number of shares:
  Basic                                18,618     18,457
  Diluted                              18,618     18,457
                                    ========== ==========

                             See accompanying notes















                            PROTEIN DESIGN LABS, INC.
                                 BALANCE SHEETS
(In thousands, except par value per share)


                                                     March 31,   December 31,
                                                       1999          1998
                                                   ------------  -----------
                                                   (unaudited)
                                                           
                     ASSETS
  Current assets:
     Cash and cash equivalents                         $27,352      $27,907
     Short-term investments                             14,948       59,233
     Other current assets                                5,436        4,608
                                                   ------------  -----------
      Total current assets                              47,736       91,748
     Property and equipment, net                        22,931       23,016
     Long-term investments                              97,961       56,299
     Other assets                                        1,083          787
                                                   ------------  -----------
                                                      $169,711     $171,850
                                                   ============  ===========

        LIABILITIES AND STOCKHOLDERS' EQUITY
  Current liabilities:
     Accounts payable                                   $1,474       $1,310
     Accrued compensation                                  989          925
     Accrued clinical trials                             1,225        1,293
     Other accrued liabilities                           1,466        3,591
     Deferred revenue                                    4,025        2,235
                                                   ------------  -----------
      Total current liabilities                          9,179        9,354

  Commitments

  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; 18,619
      and 18,595 issued and outstanding at
      March 31, 1999 and December 31, 1998,
      respectively                                         186          186
     Additional paid-in capital                        231,497      231,035
     Accumulated deficit                               (70,774)     (68,884)
     Unrealized gain on investments                       (377)         159
                                                   ------------  -----------
      Total stockholders' equity                       160,532      162,496
                                                   ------------  -----------
                                                      $169,711     $171,850
                                                   ============  ===========

                             See accompanying notes

                                  PROTEIN DESIGN LABS, INC.
                            CONDENSED STATEMENTS OF CASH FLOWS
                                       (unaudited)

(In thousands)


                                                       Three Months Ended
                                                            March 31,
                                                     ----------------------
                                                         1999        1998
                                                     ----------  ----------
                                                           
Cash flows from operating activities:
  Net loss                                             ($1,890)    ($4,013)
  Adjustments to reconcile net loss to net
    cash used in operating activities:
    Depreciation and amortization                          857         833
    Other                                                  185         376
  Changes in assets and liabilities:
    Other current assets                                  (827)        (56)
    Accounts payable                                       164          24
    Accrued liabilities                                 (2,131)       (900)
    Deferred revenue                                     1,791       1,963
                                                     ----------  ----------
Total adjustments                                           39       2,240
                                                     ----------  ----------
    Net cash used in operating activities               (1,851)     (1,773)

Cash flows from investing activities:
  Purchases of short- and long-term investments        (59,500)    (41,979)
  Maturities of short- and long-term investments        61,400      57,000
  Capital expenditures                                    (770)       (665)
  (Increase) decrease in other assets                     (296)         16
                                                     ----------  ----------
    Net cash provided by investing activities              834      14,372

Cash flows from financing activities:
  Proceeds from issuance of capital stock                  462       2,732
                                                     ----------  ----------
    Net cash provided by financing activities              462       2,732
                                                     ----------  ----------

Net increase (decrease) in cash and cash equivalents      (555)     15,331

Cash and cash equivalents at beginning of period        27,907       9,266
                                                     ----------  ----------
Cash and cash equivalents at end of period             $27,352     $24,597
                                                     ==========  ==========

                             See accompanying notes





                            PROTEIN DESIGN LABS, INC.
                          NOTES TO FINANCIAL STATEMENTS
                                 March 31, 1999
                                  (unaudited)

Summary of Significant Accounting Policies 

Organization and Business 

Since the Company's founding in 1986, a primary focus of its operations 
has been research and development. Achievement of successful research 
and development and commercialization of products derived from such 
efforts is subject to high levels of risk and significant resource 
commitments. The Company has a history of operating losses and expects 
to incur substantial additional expenses over at least the next few 
years as it continues to develop its proprietary products, devote 
significant resources to preclinical studies, clinical trials, and 
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,  and 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 quarter 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. 

The Company receives royalties on sales of Synagis[TM], 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 licensees and the rights certain licensees 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 certain licensing arrangements.

Although the Company anticipates entering into new collaborations from 
time to time, the Company presently does not anticipate continuing to 
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 increases its 
research and development, manufacturing, preclinical, clinical, 
marketing and administrative and patent activities. Accordingly, 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's intellectual property 
rights, or other sources, the Company expects to incur substantial 
operating losses in the foreseeable future 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 undertakes marketing and market 
planning activities, as the Company invests in additional facilities or 
manufacturing capacity, as the Company defends or prosecutes its patents 
and patent applications and as the Company invests in research or 
acquires additional technologies, product candidates or businesses.

Basis of Presentation and Responsibility for Quarterly Financial 
Statements

The balance sheet as of March 31, 1999 and the statements of operations 
and cash flows for the three month periods ended March 31, 1999 and 1998 
are unaudited but include all adjustments (consisting of normal 
recurring adjustments) which the Company considers necessary for a fair 
presentation of the financial position at such dates and the operating 
results and cash flows for those periods. Although the Company believes 
that the disclosures in these 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 generally accepted accounting principles 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's Annual 
Report on Form 10-K, filed with the Securities and Exchange Commission 
for the year ended December 31, 1998. Results for any quarterly period 
are not necessarily indicative of results for any other quarterly period 
or for the entire year.

Cash Equivalents, Investments and Concentration of Credit Risk 

The Company considers all highly liquid investments purchased with a 
maturity of three months or less at the date of acquisition to be cash 
equivalents. The "Other" adjustments line item in the Statements of Cash 
Flows represents the accretion of the book value of certain debt 
securities. The Company places its cash and short-term and long-term 
investments with high-credit-quality financial institutions and in 
securities of the U.S. government and U.S. government agencies and, by 
policy, limits the amount of credit exposure in any one financial 
instrument. To date, the Company has not experienced credit losses on 
investments in these instruments.

Cash and cash equivalents for the period ended March 31, 1999 increased 
primarily as a result of maturities of short-term and the redemption of 
certain long-term investments. The changes in short- and long-term 
investments were the result of reinvestment of these maturing and 
redeemed securities into 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 collaborative, humanization and patent licensing 
agreements with third parties provide for the payment of royalties to 
the Company based on net sales of the licensed product under the 
agreement.  The agreements generally provide for royalty payments to the 
Company 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-refundable signing and licensing fees 
under these arrangements are recognized as revenue when there are no 
future performance obligations remaining with respect to such fees.

Net Income Per Share

In accordance with Financial Accounting Standards Board Statement No. 
128, "Earnings Per Share" ("FAS 128"), basic net earnings (loss) per 
share have been computed using the weighted average number of shares of 
common stock outstanding during the periods presented and excludesed the 
dilutive effect of stock options. If the Company had a net loss position 
for the applicable period, as is the case for the three month periods 
ended March 31, 1999 and 1998, FAS 128 specifies that the Company shall 
not include the effect of stock options outstanding for the applicable 
period as the effect would be antidilutive.

Following is a reconciliation of the numerators and denominators of the 
basic and diluted net loss per share computations for the periods 
presented below:

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



                                     Three Months Ended 
                                          March 31,
                                    ---------------------
                                         1999       1998
                                    ---------- ----------
                                               
Numerator:
 Net loss                             $(1,890)  $(4,013)
                                    ========== ==========

Denominator:
 Basic net loss per share -
  weighted-average shares              18,618    18,457

 Dilutive potential common shares:
  Stock Options                           --        --
                                    ---------- ----------

Denominator for diluted net
 loss per share                        18,618    18,457
                                    ========== ==========

Basic net loss per share               $(0.10)   $(0.22)
                                    ========== ==========
Diluted net loss per share             $(0.10)   $(0.22)
                                    ========== ==========



Comprehensive Income

In accordance with Financial Accounting Standards Statement No. 130, 
"Reporting Comprehensive Income," ("FAS 130"), the Company is required 
to display comprehensive income and its components as part of the 
Company's complete set of financial statements. The measurement and 
presentation of net loss did not change. Comprehensive income is 
comprised of net loss and other comprehensive income. Other 
comprehensive income 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. 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 March 31, 1999 and 1998, total comprehensive loss 
amounted to $2.4 million and $4.2 million, respectively. 

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 2000. 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 generally 
accepted accounting principles 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 
has 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. These estimates and assumptions could differ 
significantly from the amounts which may actually be realized.

In 1997, Boehringer Mannheim GmbH ("Boehringer Mannheim") invoked the 
dispute resolution provisions under its collaborative research agreement 
to address the reimbursement of up to $2.0 million for the Phase II 
study of Ostavir[TM] for the treatment of chronic hepatitis B ("CHB") then
being conducted by Boehringer Mannheim as well as certain legal expenses 
related to Boehringer Mannheim's participation in the Company's public 
offering in the first quarter of 1997. In March 1998, Roche Holding Ltd 
acquired Boehringer Mannheim. The Company is unable to predict the 
outcome of this proceeding but in any event has estimated and recorded a 
liability with respect to this matter. The collaborative research 
agreement with Boehringer Mannheim provides for reimbursement from PDL 
of costs and expenses of up to $2.0 million for a Phase II study of 
Ostavir in the event certain conditions are met with respect to that 
study. 

Other Accrued Liabilities

Other accrued liabilities decreased from December 31, 1998 infor the 
period ended March 31, 1999 primarily as a result of payments of 
approximately $1.3 million for capital expenditures related to the 
Company's new Fremont, California facilities. 

Deferred Revenue

Deferred revenue increased from December 31, 1998 infor the period ended 
March 31, 1999 primarily as a result of research and development funding 
of $2.4 million received in advance of the performance of the research.


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.

OVERVIEW 

Since the Company's founding in 1986, a primary focus of its 
operations has been research and development. Achievement of successful 
research and development and commercialization of products derived from 
such efforts is subject to high levels of risk and significant resource 
commitments. The Company has a history of operating losses and expects 
to incur substantial additional expenses over at least the next few 
years as it continues to develop its proprietary products, devote 
significant resources to preclinical studies, clinical trials, and 
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, and 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 quarter 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. 


The Company receives royalties on sales of Synagis[TM], 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 licensees and the rights certain licensees 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 certain licensing arrangements.

Although the Company anticipates entering into new collaborations 
from time to time, the Company presently does not anticipate continuing 
to 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 increases its 
research and development, manufacturing, preclinical, clinical, 
marketing and administrative and patent activities. Accordingly, 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's intellectual property 
rights, or other sources, the Company expects to incur substantial 
operating losses in the foreseeable future 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 facilities or 
manufacturing capacity, as the Company defends or prosecutes its patents 
and patent applications and as the Company invests in research or 
acquires additional technologies, product candidates or businesses.

Contract revenues 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 principally due to 
timing of cash payments received under research and development 
contracts.

RESULTS OF OPERATIONS 

Three Months Ended March 31, 1999 and 1998

The Company's total revenues for the three months ended March 31, 
1999 were $8.8 million as compared to $4.2 million in the first quarter 
of 1998. Total revenues recognized under agreements with third parties 
were $6.5 million in the first quarter of 1999 compared to $1.8 million 
in the comparable period in 1998. Interest and other income was 
approximately $2.4 million in each of the first quarters of 1999 and 
1998.

Revenues under agreements with third parties of $6.5 million for 
the three months ended March 31, 1999 consisted principally of a $3.0 
million non-refundable, non-creditable signing and licensing fee from 
BioNet Pharma GmbH ("BioNet") for rights to the SMART[TM] Anti-L-Selectin 
Antibody in Europe, the Middle East and Africa, royalties and research 
and development reimbursement funding. In the first quarter of 1998, 
revenues of $1.8 million under agreements with third parties consisted 
principally of milestone payments earned under licensing agreements and 
research and development reimbursement funding.

Total costs and expenses for the three months ended March 31, 1999 
increased to $10.7 million from $8.2 million in the comparable period in 
1998. 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 and associated expenses 
to manage and support the Company's expanding operations.

Research and development expenses for the three month period ended 
March 31, 1999 increased to $8.3 million from $6.4 million in the 
comparable period in 1998. The increase in costs was primarily due to 
the addition of staff, the continuation of clinical trials, costs of 
conducting preclinical tests and expansion of research and 
pharmaceutical development capabilities, including support for both 
clinical development and manufacturing process development.

General and administrative expenses for the three months ended 
March 31, 1999 increased to $2.4 million from $1.8 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 and payments of third party royalties due 
on sales of Zenapax.

LIQUIDITY AND CAPITAL RESOURCES 

To date, the Company has financed its operations primarily through 
public and private placements of equity securities, research and 
development revenues and interest income on invested capital. At March 
31, 1999, the Company had cash, cash equivalents and investments in the 
aggregate of $140.3 million, compared to $143.4 million at December 31, 
1998.  Cash and cash equivalents and investments for the period do not 
include the $3.0 million non-refundable, non-creditable signing and 
licensing fee from BioNet received in May 1999.

In 1997, Boehringer Mannheim GmbH ("Boehringer Mannheim") invoked 
the dispute resolution provisions under its collaborative research 
agreement with the Company to address the reimbursement of up to $2.0 
million for the Phase II study of Ostavir for the treatment of chronic 
hepatitis B ("CHB") then being conducted by Boehringer Mannheim as well 
as certain legal expenses related to Boehringer Mannheim's participation 
in the Company's public offering in the first quarter of 1997.  In March 
1998, Roche Holding Ltd acquired Boehringer Mannheim.  The Company is 
unable to predict the outcome of this proceeding but in any event has 
estimated and recorded a liability with respect to this matter. The 
collaborative research agreement with Boehringer Mannheim provides for 
reimbursement from PDL of costs and expenses of up to $2.0 million for a 
Phase II study of Ostavir in the event certain conditions are met with 
respect to that study. 

As set forth in the Statements of Cash Flows, net cash used in 
operating activities was $1.9 million for the three months ended March 
31, 1999 compared to $1.8 million in the same period in 1998. 

As set forth in the Statements of Cash Flows, net cash provided by 
investing activities for the three months ended March 31, 1999 was $0.8 
million. Net Cash provided by investing activities for the comparable 
period in 1998 was $14.3 million resulting primarily from the maturities 
of short- and long-term investments.

As set forth in the Statements of Cash Flows, net cash provided by 
financing activities for each of the three months ended March 31, 1999 
and 1998 was $0.5 million and $2.7 million, respectively, in each period 
resulting primarily from the exercise of outstanding stock options. Net 
cash provided by financing activities for the comparable period in 1998 
was $2.7 million. The 1998 amount resulted primarily from exercise of 
outstanding stock options.

The Company's future capital requirements will depend on numerous 
factors, including, among others, royalties from sales of products of 
third party licensees, including Synagis, Herceptin and  Zenapax; the 
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's licensees to obtain regulatory approval and successfully 
manufacture and market products licensed under the Company's patents; 
the continued or additional support by 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 devotes to self-funded products, manufacturing facilities 
and methods and advanced technologies; the ability of the Company to 
obtain and retain funding from third parties under collaborative 
arrangementsagreements; the continued development of internal marketing 
and sales capabilities; the demand for the Company's potential products, 
if and when approved; potential acquisitions of technology, product 
candidates or businesses by the Company; and the costs of defending or 
prosecuting any patent opposition or litigation necessary to protect the 
Company's proprietary technology. In order to develop and commercialize 
its potential products the Company 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 believes that 
existing capital resources will be adequate to satisfy its 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. 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 preliminary assessment by an outside consultant 
retained by the Company in early 1998, the Company believes that its 
most important information systems are Y2K-compliant; however, the 
Company is in the process of conducting a comprehensive inventory and 
evaluation of its systems, equipment and facilities. In connection with 
its recent move to a new headquarters and research and development 
facility in Fremont, California, the Company has replaced or upgraded 
many of its systems and equipment that were known or believed to present 
potential Y2K problems. In addition, the Company specifically identified 
and contacted certain key vendors regarding Y2K compliance of its key 
information systems and has either received software 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 these systems.  

The Company has retained this consultant to develop and implement 
a Y2K program, which retention includes the development of a more 
extensive inventory and assessment program for the Company with respect 
to Y2K risks. The consultant has expertise in assessing other 
organizations with similar vendors and computer systems. This program 
will include a comprehensive review of all major systems and equipment 
of the Company and will also include a contingency plan for any mission 
critical systems that may be identified as 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 not 
reviewed all systems and processes for potential Y2K problems nor has 
the Company identified alternative remediation plans if upgrade or 
replacement is not feasible. The Company will consider the need for such 
remediation or replacement plans as it continues to assess the Y2K risk. 
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 is implementing 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 less than $100,000. If implementation of 
replacement systems is delayed, or if 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 plans to initiate further 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. 


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 March 31, 1999, 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.





















ITEM 5.  OTHER INFORMATION - RISK FACTORS

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 has 
a history of operating losses and expects to incur substantial 
additional expenses over at least the next several years as it continues 
to develop its potential products, to invest in new research areas and 
to devote significant resources to preclinical studies, clinical trials 
and manufacturing. As of March 31, 1999, the Company had an accumulated 
deficit of approximately $70.8 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, its 
collaborative partners or licensees will successfully develop products, 
obtain required regulatory approvals, manufacture products at an 
acceptable cost and with appropriate quality, or successfully market 
such products. 

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 
under 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 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 under licensing arrangements.

Although the Company anticipates entering into new collaborations 
from time to time, the Company presently does not anticipate continuing 
to 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 increases its 
research and development, manufacturing, preclinical, clinical, 
marketing and administrative and patent activities. Accordingly, 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's intellectual property 
rights, or other sources, the Company expects to incur substantial 
operating losses in the foreseeable future 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 facilities or 
manufacturing capacity, as the Company defends or prosecutes its patents 
and patent applications and as the Company invests in research or 
acquires additional technologies, product candidates or businesses. For 
example, revenues in the first quarter of 1999 included a $3.0 million 
non-refundable, non-creditable licensing and signing fee from BioNet 
Pharma GmbH ("BioNet"). In the absence of similar substantial non-
recurring revenues or significant royalty revenues in any future period, 
there can be no assurance that the Company will sustain or increase the 
level of revenues in any future quarters from those reported in the 
first quarter of 1999.

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[TM], 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 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, 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. 

The amount of net losses and the time required to reach sustained 
profitability are highly uncertain. To achieve sustained profitable 
operations, the Company, alone or with its collaborative partners, must 
successfully discover, develop, manufacture, obtain regulatory approvals 
for and market potential products. No assurances can be given that the 
Company will be able to achieve or sustain profitability, and results 
are expected to fluctuate from quarter to quarter and year to year.

Dependence On Licensees With Respect to Marketed Products. The 
Company is dependent upon the development and marketing efforts of its 
licensees with respect to products for which the Company may receive 
royalties. For example, in 1998, the Company began receiving royalties 
from sales of Zenapax, a product exclusively licensed to Roche. The 
Company's royalties on Zenapax depend upon the efforts of Roche and 
there can be no assurance that Roche's development, regulatory and 
marketing efforts will be successful, including without limitation, 
whether or how quickly Zenapax might receive regulatory approvals in 
various countries throughout the world and how rapidly it might be 
adopted by the medical community. Moreover, Simulect[R], a product 
competitive with Zenapax, is marketed in the U.S. and other countries 
and there can be no assurance that Roche will successfully market and 
sell Zenapax against this and other available competitive products. In 
addition, there can be no assurance that other independently developed 
products of Roche, including CellCept[R], or others will not compete with 
or prevent Zenapax from achieving meaningful sales. Roche's development 
and marketing efforts for CellCept may result in delays or a relatively 
smaller resource commitment to marketing 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, 
Zenapax is being tested in certain early stage clinical trials in 
autoimmune indications. There can be no assurance that clinical 
development in autoimmune indications will continue or, that even if the 
further clinical development is pursued, that Zenapax will be shown to 
be safe and efficacious, 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 
the business and financial condition of the Company.

The Company has also entered into non-exclusive patent licensing 
arrangements for Synagis and Herceptin. The Company is dependent upon 
the further development, regulatory and marketing efforts of its 
licensees with respect 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's success is significantly dependent on its 
ability to obtain and maintain patent protection for its products and 
technologies and to preserve its trade secrets and operate without 
infringing on the proprietary rights of third parties. The Company files 
and prosecutes patent applications to protect its inventions. No 
assurance can be given that the Company's pending patent applications 
will result in the issuance of patents or that any patents will 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, or 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 licenses 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 inventor of the inventions covered by its pending 
patent applications or patents or that it was the first to file patent 
applications for such inventions. The patent positions of biotechnology 
firms generally are highly uncertain and 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") 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 
the extent of any patent protection may vary in different countries.

The Company has a number of patents and has exclusively licensed 
certain patents from third parties. In June 1996, the Company was issued 
a U.S. 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") and European Patent Office ("EPO") 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 humanization patent issued by the EPO applies in the 
United Kingdom, Germany, France, Italy and eight other European 
countries. The EPO (but not PTO) procedures provided for an opposition 
period in which other parties submitted arguments as to why the patent 
was incorrectly granted and should be withdrawn or limited. Eighteen 
notices of opposition to the Company's European patent were filed during 
the opposition period, 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 recently received on May 12, 
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 2 or more years to be resolved.

The preliminary view from the EPO raises significant questions 
regarding the validity of the 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, 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 European or similar U.S. and Japanese 
patents of the Company.

A 6-month opposition period has also begun with respect to the 
Company's humanization patent issued in Japan in late 1998. Similar to 
the process in Europe, third parties have the opportunity to file their 
opposition to the issuance of the JPO patent. The Company intends to 
vigorously defend the European patent and, if necessary, the Japanese 
patent and 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 of companies, universities and research institutions have 
filed patent applications 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's products or processes, and such claims are 
ultimately determined to be valid, no assurance can be given that the 
Company would be able to obtain licenses to these patents at a 
reasonable cost, if at all, or to develop or obtain alternative 
technology.

The Company is aware that Celltech Limited ("Celltech") has been 
granted a patent by the EPO covering certain humanized antibodies 
("European Adair Patent"), which the Company has opposed, and that 
Celltech has also been issued a corresponding U.S. patent (the "U.S. 
Adair Patent") that contains claims that may be considered broader in 
scope than the European Adair Patent. The Company is currently reviewing 
the claims under the U.S. Adair Patent in an effort to determine its 
future course of action with respect to this patent. If it were 
determined that the Company's SMART antibodies were covered by the 
European or U.S. Adair Patents, the Company might be required to obtain 
a license under such patents or to significantly alter its 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 would be able to 
successfully alter its processes or products to avoid infringing such 
patents or to obtain such a license from Celltech 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.

In addition, if the claims of the U.S. Adair Patent or any related 
patent applications conflict with claims in the Company's U.S. patents 
or patent applications, there can be no assurance that an interference 
would not be declared by the PTO, which could take several years to 
resolve and could involve significant expense to the Company. Also, such 
conflict could prevent issuance of additional patents to the Company 
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's 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 does not have a license (although 
Roche has advised the Company that it has a license covering Zenapax), 
which may cover a process the Company uses to produce its potential 
products. If it were determined that the Company's processes were 
covered by such patent, the Company might be required to obtain a 
license under such patent or to significantly alter its processes or 
products, if necessary to manufacture or import its products in Europe. 
There can be no assurance that the Company would be able to successfully 
alter its processes or products to avoid infringing such patent or to 
obtain such a license 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.

The Company is also aware of 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 uses to 
produce its potential products. The Company has been advised that an 
exclusive license has been previously granted to a third party under 
this patent. If it were determined that the Company's processes were 
covered by such patent, the Company might be required to obtain a 
license under such patent or to significantly alter its processes or 
products, if necessary to manufacture or import its products in the U.S. 
There can be no assurance that the Company would be able to successfully 
alter its processes or products to avoid infringing such patent or to 
obtain such a license 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. Moreover, any 
alteration of processes or products to avoid infringing the patent could 
result in a significant delay in achieving regulatory approval with 
respect to the products affected by such alterations.

In addition to seeking the protection of patents and licenses, the 
Company also relies upon trade secrets, know-how and continuing 
technological innovation which it seeks 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 obtaining regulatory 
approval for the commercial sale of any of its potential products, the 
Company must demonstrate through preclinical studies and clinical trials 
that the product is safe and efficacious for use in the clinical 
indication for which approval is sought. There can be no assurance that 
the Company will be permitted to undertake 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, 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 present or 
future clinical trials will demonstrate the safety and efficacy of any 
potential products or will result in approval to market 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, 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-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 representative of 
results that may be obtained as the trial proceeds to completion. 

The Company may at times elect to aggressively enter potential 
products into Phase I/II trials to determine preliminary safety and 
efficacy in specific indications. In addition, in certain cases the 
Company has commenced clinical trials without conducting preclinical 
animal testing where an appropriate animal model does not exist. 
Similarly, the Company or its partners at times will conduct potentially 
pivotal Phase II/III or Phase III trials based on limited Phase I or 
Phase I/II data. As a result of these and other factors, the Company 
anticipates that only some of its potential products will show safety 
and efficacy in clinical trials and that the number of products that 
fail to show safety and efficacy may be significant. 

Limited Experience With Clinical Trials; Risk Of Delay. The 
Company has conducted only a limited number of clinical trials to date. 
There can be no assurance that the Company will be able to successfully 
commence and complete all of its planned clinical trials without 
significant additional resources and expertise. In addition, there can 
be no assurance that the Company will meet its contemplated development 
schedule for any of its potential products. The inability of the Company 
or its collaborative partners to commence or continue clinical trials as 
currently planned, to complete the 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.

The rate of completion of the Company's or its collaborators' 
clinical trials is significantly dependent upon, among other factors, 
the rate of patient enrollment. Patient enrollment is a function of many 
factors, including, among others, the size of the patient population, 
perceived risks and benefits of the drug under study, availability of 
competing therapies, access to reimbursement from insurance companies or 
government sources, design of the protocol, proximity of and access by 
patients to clinical sites, patient referral practices, eligibility 
criteria for the study in question and efforts of the sponsor of and 
clinical sites involved in the trial to facilitate timely enrollment in 
the trial. Delays in the planned rate of patient enrollment may result 
in increased costs and expenses in completion of the trial or may 
require the Company to undertake additional studies in order to obtain 
regulatory approval if the applicable standard of care changes in the 
therapeutic indication under study. These considerations may lead the 
Company to consider the termination of ongoing clinical trials or 
halting further development of a product for a particular indication. 

Dependence On Collaborative Partners. The Company has 
collaborative agreements with several pharmaceutical or other companies 
to develop, manufacture and market certain 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 is relying on its collaborative partners to 
conduct clinical trials, to compile and analyze the data received from 
such trials, to obtain regulatory approvals and, if approved, to 
manufacture and market these licensed products. As a result, the Company 
often has little or no control over the 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 collaborative research agreements are generally 
terminable by its partners on short notice. Suspension or termination of 
certain of the Company's current collaborative research agreements could 
have a material adverse effect on the Company's operations and could 
significantly delay the development of the affected products. For 
example, Boehringer Mannheim GmbH ("Boehringer Mannheim") and the 
Company from time to time had differences with respect to the clinical 
development of certain products licensed by the Company to Boehringer 
Mannheim under a collaborative agreement. In December 1997, as a result 
of Boehringer Mannheim's internal review of products licensed from the 
Company, product rights to the Human Anti-Hepatitis B Antibody 
("Ostavir") were returned to the Company. In March 1998, Roche acquired 
Corange Limited ("Corange"), the parent company of Boehringer Mannheim. 
Roche's review of the products acquired from Boehringer Mannheim 
resulted in a decision to return the SMART Anti-L-Selectin Antibody and 
an antibody directed against an undisclosed cardiovascular target to the 
Company effective as of December 31, 1998. Although the Company has 
licensed certain rights to the SMART Anti-L-Selectin Antibody to BioNet 
in order to continue its development, the development of this compound 
has been delayed as a result of the review and return of the product by 
Roche. Moreover, the development of the other compound returned by Roche 
has been delayed significantly and there can be no assurance that the 
Company will continue or initiate further development efforts with this 
compound. In addition, Roche acquired 1,682,877 shares of the Company's 
common stock held by Corange which are no longer subject to contractual 
limitations on disposition other than certain restrictions on transfers 
of significant blocks of stock. Further, Boehringer Mannheim has invoked 
the dispute resolution provisions under its collaborative research 
agreement to address the reimbursement of up to $2.0 million for the 
Phase II study of Ostavir for the treatment of chronic hepatitis B 
("CHB") conducted by Boehringer Mannheim. The Company is unable to 
predict the outcome of this proceeding but in any event has estimated 
and recorded a liability with respect to this matter. 

Continued funding and participation by collaborative partners will 
depend on the timely achievement of 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, the commitment of management of the collaborative partners to 
the continued development of the licensed products, the relationships 
among the individuals responsible for the implementation and maintenance 
of the collaborative efforts, the relative advantages of alternative 
products 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 ability to enter into new collaborations and the 
willingness of the Company's existing collaborators to continue 
development of the Company's potential products depends upon, among 
other things, the Company's patent position with respect to such 
products. In this regard, the Company has been issued 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 patents 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 Company to collect royalties on existing 
licensed products, and 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. 

Absence Of Manufacturing Experience. Of the products developed by 
the Company which are currently in clinical development, Roche is 
responsible for manufacturing Zenapax and the Company is responsible for 
manufacturing the Company's other products for its own development. The 
Company currently leases approximately 47,000 square feet housing its 
manufacturing facilities in Plymouth, Minnesota. The Company intends to 
continue to manufacture potential products for use in preclinical and 
clinical trials using this 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 accordance with such 
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 has experienced some difficulties in the past in 
manufacturing certain potential products on a consistent basis. 
Production interruptions, if they occur, could significantly delay 
clinical development of potential products, reduce third party or 
clinical researcher interest and support of proposed clinical trials, 
and possibly delay commercialization of such products and impair their 
competitive position, which would have a material adverse effect on the 
business and financial condition of the Company. 

The Company has no experience in manufacturing commercial 
quantities of its potential products and currently does not have 
sufficient capacity to manufacture all of its potential products on a 
commercial scale. In order to obtain regulatory approvals and to create 
capacity to produce its products for commercial sale at an acceptable 
cost, the Company will need to improve and expand its existing 
manufacturing capabilities, including demonstration to the FDA and 
corresponding foreign authorities of its ability to manufacture its 
products using controlled, reproducible processes. Accordingly, the 
Company is evaluating plans to improve and expand the capacity of its 
current manufacturing facility. Such plans, if fully implemented, would 
result in substantial costs to the Company and may require a suspension 
of manufacturing operations during construction. There can be no 
assurance that construction delays would not occur, and any such delays 
could impair the Company's ability to produce adequate supplies of its 
potential products for clinical use or commercial sale on a timely 
basis. Further, there can be no assurance that the Company will 
successfully improve and expand its manufacturing capability 
sufficiently to obtain necessary regulatory approvals and to produce 
adequate commercial supplies of its potential products on a timely 
basis. Failure to do so could delay commercialization of such products 
and impair their competitive position, which could have a material 
adverse effect on the business or financial condition of the Company.

Uncertainties Resulting From Manufacturing Changes. Manufacturing 
of antibodies for use as therapeutics in compliance with regulatory 
requirements is complex, time-consuming and expensive. When certain 
changes are made in the manufacturing process, it is necessary 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, if 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. 
Depending upon the type and degree of differences between the newer and 
older drug material, various studies could be required 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. Manufacturing changes have been made 
or are likely to be made for the production of the Company's products 
currently in clinical development, in particular the SMART M195 and 
SMART Anti-CD3 Antibodies. There can be no assurance that such changes 
will not 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 products and could have a material adverse 
effect on the business and financial condition of the Company.

Dependence On Suppliers. The Company is dependent on outside 
vendors for the supply of raw materials used to produce its product 
candidates. The Company currently qualifies only one or a few vendors 
for its source of certain raw materials. Therefore, once a supplier's 
materials have been selected for use in the Company's manufacturing 
process, the supplier in effect becomes a sole or limited source of such 
raw materials to the Company due to the extensive regulatory compliance 
procedures governing changes in manufacturing processes. Although the 
Company believes it could qualify 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 time and expense 
necessary to transition a replacement supplier's product into the 
Company's manufacturing process, could disrupt the Company's operations 
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 which 
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, cancers and 
viral infections. 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 competitors may be fully integrated pharmaceutical 
companies with substantial expertise in research 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 aware that potential competitors are developing antibodies or 
other compounds for treating autoimmune diseases, inflammatory 
conditions, cancers and viral infections. 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, and 
several companies have developed or may develop technologies that can 
compete with the Company's SMART and human antibody technologies. There 
can be no assurance that competitors will not succeed in more rapidly 
developing and marketing technologies and products that are more 
effective than the products being developed by the Company or that would 
render the Company's products or technology obsolete or noncompetitive. 
Further, there can be no assurance that the Company's collaborative 
partners will not independently develop products competitive with those 
licensed to such partners by the Company, thereby reducing the 
likelihood that the Company will receive revenues under its agreements 
with such partners.

Any potential product that the Company or its 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, 
the relative speed with which the Company and its 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 of 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, Novartis 
has a significant marketing and sales force directed to the 
transplantation market and there can be no assurance that Roche will 
successfully market and sell Zenapax against this and other available 
products. 

Other competitive factors include the capabilities of the 
Company's collaborative partners, product efficacy and safety, timing 
and scope of regulatory approval, product availability, marketing and 
sales capabilities, reimbursement coverage, the amount of clinical 
benefit of the Company's products relative to their cost, method of 
administration, price and patent protection. There can be no assurance 
that the Company's competitors will not develop more efficacious or more 
affordable products, or achieve earlier product development completion, 
patent protection, regulatory approval or product commercialization than 
the Company. The occurrence of any of these events by the Company's 
competitors 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. To be successful, 
the Company will have to retain its qualified clinical, manufacturing, 
scientific and management personnel. The Company faces competition for 
personnel from other companies, academic institutions, government 
entities and other organizations. There can be no assurance that the 
Company will be successful in hiring or retaining qualified personnel, 
and its failure to do so could have a material adverse effect on the 
business and financial condition of the Company.

Potential Volatility Of Stock Price. The market for the Company's 
securities is volatile and investment in these securities involves 
substantial risk. The market prices for securities of biotechnology 
companies (including the Company) have been highly volatile, and 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 such as disappointing sales of approved 
products, approval or introduction of competing products and 
technologies, results of clinical trials, delays in manufacturing or 
clinical trial plans, fluctuations in the Company's operating results, 
disputes or disagreements with collaborative partners, unfavorable news 
or information resulting in the reduction in value of significant 
intellectual property assets, market reaction to announcements by other 
biotechnology or pharmaceutical companies, announcements of 
technological innovations or new commercial therapeutic products by the 
Company or its competitors, initiation, termination or modification of 
agreements with collaborative partners, failures or unexpected delays in 
manufacturing or in obtaining regulatory approvals or FDA advisory panel 
recommendations, developments or disputes as to patent or other 
proprietary rights, loss of key personnel, litigation, public concern as 
to the safety of drugs developed by the Company, regulatory developments 
in either the U.S. or foreign countries (such as opinions, 
recommendations or statements by the FDA or FDA advisory panels, health 
care reform measures or proposals), market acceptance of products 
developed and marketed by the Company's collaborators, sales of the 
Company's common stock held by collaborative partners or insiders and 
general market conditions could result in the Company's failure to meet 
the expectations of securities analysts or investors. In such event, or 
in the event that adverse conditions prevail or are perceived to prevail 
with respect to the Company's business, the price of the Company's 
common stock would likely drop significantly. In the past, following 
significant drops in the price of a company's common stock, securities 
class action litigation has often been instituted against such a 
company. Such litigation against the Company 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.









ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

(a)  Exhibits - None 


(b)     No Reports on Form 8-K were filed during the quarter ended March 
31, 1999.







































SIGNATURE



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.


Dated:  May 14, 1999





                                                  PROTEIN DESIGN LABS, INC.
                                                     (Registrant)




                                                  Laurence Jay Korn
                                                  Chief Executive Officer, 
                                                  Chairperson of the 
                                                  Board of Directors
                                                  (Principal Executive Officer)



                                                  Jon Saxe
                                                  Senior Adviser to the Chief
                                                  Executive Officer
                                                  (Chief Accounting Officer)