UNITED STATES
                         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 Quarter Ended June 30, 1997

                                          OR

      / /   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
            EXCHANGE ACT OF 1934

                           Commission File Number 0-19171

                                  ICOS CORPORATION
                (Exact name of registrant as specified in its charter)         

            Delaware                                  91-1463450
 (State or other jurisdiction of           (I.R.S. Employer Identification No.)
  incorporation or organization)


22021 20th Avenue Southeast, Bothell WA                               98021 
(Address of principal executive offices)                           (Zip Code)


                                      (425)485-1900
                    (Registrant's telephone number, including area code)
                                    

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.                                  
/X/Yes / /No

Indicate the number of shares outstanding of each of the issuer's classes of 
Common Stock, as of the latest practicable date.

           Class                             Outstanding at August 13, 1997
           -----                             ------------------------------
Common Stock, $0.01 par value                           39,557,399




                                     ICOS CORPORATION

                                     TABLE OF CONTENTS



PART I. Financial Information

        ITEM 1. FINANCIAL STATEMENTS

        Statements of Operations for the three months ended June 30, 1997
        and 1996, the six months ended June 30, 1997 and 1996 and the period
        from September 21, 1989 (incorporation) through June 30, 1997........1

        Balance Sheets as of June 30, 1997 and December 31,1996..............2

        Statements of Stockholders' Equity for the period from September 21, 
        1989 (incorporation) through June 30, 1997...........................3

        Statements of Cash Flows for the six months ended June 30, 1997 and
        1996, and the period from September 21, 1989 (incorporation)
        through June 30, 1997................................................5

        Notes to Financial Statements........................................6

        ITEM 2.

        Management's Discussion and Analysis of Financial Condition and
        Results of Operations................................................8

PART II.  OTHER INFORMATION
        ITEM 1: Legal Proceedings............................................*

        ITEM 2: Changes in Securities........................................*

        ITEM 3: Defaults Upon Senior Securities..............................*

        ITEM 4: Submission of Matters to a Vote of Security Holders.........14

        ITEM 5: Other Information............................................*

        ITEM 6: Exhibits and Reports on Form 8-K............................15

SIGNATURE...................................................................16

EXHIBITS....................................................................17

*No information provided due to inapplicability of item.
                 


                                                                        ICOS CORPORATION                                  
                                                                 (A Development Stage Company)
                                                                     STATEMENTS OF OPERATIONS
                                                                           (unaudited)


ITEM 1.

                                                                                                   Period from
                                                                                                September 21, 1989
                                              Three months ended          Six months ended       (incorporation)
                                                   June 30,                   June 30,           through June 30,
                                         --------------------------- -------------------------- ------------------
                                              1997         1996          1997          1996            1997
                                         ------------- ------------- ------------ ------------- ------------------
                                                                                                  
Revenue:

Collaborative research & development     $  6,842,984  $    500,000  $ 9,059,971  $  1,000,000  $  14,559,971
License of technology                       8,500,000             -    8,500,000             -      8,500,000
Research grants                                     -             -            -             -      1,451,409
                                         ------------- ------------- ------------ ------------- --------------
     Total revenue                         15,342,984       500,000   17,559,971     1,000,000     24,511,380

Operating expenses:

   Research and development                 9,842,142     7,091,661   18,971,422    13,799,918    134,674,443
   General and administrative                 548,126       675,251    1,297,950     1,361,138     19,250,811
                                         ------------- ------------- ------------ ------------- --------------
     Total operating expenses              10,390,268     7,766,912   20,269,372    15,161,056    153,925,254  
                                         ------------- ------------- ------------ ------------- --------------
     Operating income (loss)                4,952,716    (7,266,912)  (2,709,401)  (14,161,056)  (129,413,874)
                                         ------------- ------------- ------------ ------------- --------------
Other income (expense):

   Investment income                          473,292       475,142      999,754       698,759     18,288,231 
   Interest expense                                 -             -            -             -       (887,899)
   Other, net                                  (2,051)          245       (7,808)        1,214       (114,153)
                                         ------------- ------------- ------------ ------------- --------------
                                              471,241       475,387      991,946       699,973     17,286,179
                                         ------------- ------------- ------------ ------------- --------------
     Net income (loss)                   $  5,423,957 $  (6,791,525) $(1,717,455) $(13,461,083) $(112,127,695)
                                         ============= ============= ============ ============= ==============

Net income (loss) per common share       $       0.13 $       (0.19) $      (.04)        (0.39)
                                         ============= ============= ============ =============
Weighted average common and common
   equivalent shares outstanding           40,421,847    36,208,083   39,488,209    34,236,986
                                         ============= ============= ============ =============

<FN>
See accompanying notes to financial statements.
                                                                 

                                          Page 1                   
                                                                   

                                                                        ICOS CORPORATION
                                                                 (A Development Stage Company)
                                                                         BALANCE SHEETS



                                                         ASSETS

                                                                                    June 30,      December 31,
                                                                                      1997           1996
                                                                                 -------------   -------------
                                                                                   (unaudited)
                                                                                               
Current assets:                                                                                
  Cash and cash equivalents                                                       $  3,271,934  $  2,159,008
  Investment securities available for sale, at market value                         28,678,381    39,511,820
  Interest receivable                                                                  383,586       149,404
  Receivables under collaborative arrangements                                       6,240,047             -
  Other receivables                                                                    138,465        92,969
  Prepaid expenses                                                                     519,235       599,752
                                                                                  ------------  ------------
    Total current assets                                                            39,231,648    42,512,953
Property and equipment, at cost:
  Land                                                                               2,309,979     2,309,979
  Leasehold improvements                                                            13,657,909    13,659,272 
  Furniture and equipment                                                           14,285,404    13,631,566
                                                                                  ------------  ------------
                                                                                    30,253,292    29,600,817
  Less accumulated depreciation and amortization                                    15,914,384    13,997,511
                                                                                  ------------  ------------
                                                                                    14,338,908    15,603,306
                                                                                  ------------  ------------
  Construction in progress                                                             141,057        23,600
                                                                                  ------------  ------------ 
    Net property and equipment                                                      14,479,965    15,626,906
                                                                                  ------------  ------------
  Loan receivable from related party                                                 5,512,750             -
  Other assets                                                                         258,607        65,318
                                                                                  ------------  ------------
                                                                                     5,771,357        65,318
                                                                                  ------------  ------------
                                                                                  $ 59,482,970  $ 58,205,177
                                                                                  ============  ============



                                          LIABILITIES AND STOCKHOLDERS' EQUITY
                                                                                               
Current liabilities:
  Accounts payable                                                                $  1,633,019  $  1,183,623
  Accrued payroll and benefits                                                         824,968       649,562
  Other accrued expenses                                                               754,953     1,104,711
                                                                                  ------------  ------------ 
    Total current liabilities                                                        3,212,940     2,937,896
                                                                                  ------------  ------------
Stockholders' equity:
  Preferred Stock, $.01 par value. Authorized 2,000,000 shares; none issued                  -             -
  Common Stock, $.01 par value.  Authorized 100,000,000 shares; issued and
    outstanding, 39,554,734 at June 30, 1997 and 39,417,753 at 
    December 31, 1996                                                                  395,547       394,177     
  Additional paid-in capital                                                       167,998,935   165,273,054
  Net unrealized gain on investment securities available for sale                        3,243        10,290 
  Deficit accumulated during the development stage                                (112,127,695) (110,410,240)
                                                                                  ------------- -------------
    Total stockholders' equity                                                      56,270,030    55,267,281
                                                                                  ------------- -------------
                                                                                  $ 59,482,970  $ 58,205,177
<FN>                                                                              ============= =============  
See accompanying notes to financial statements.
                                     Page 2




                             



                                                                        ICOS CORPORATION
                                                                 (A Development Stage Company)
                                                               STATEMENTS OF STOCKHOLDERS' EQUITY 




                                                         Common  Additional   Restricted  Unrealized    Deficit       Total
                                                          Stock    paid-in      Common    gain(loss)  accumulated stockholders'
                                                                   capital       Stock        on       during the    equity
                                                                                          securities  development
                                                                                           available     stage
                                                                                           for sale
                                                        -------- ------------ ----------- ---------- ------------ -------------
                                                                                                   
Issuance of 5,515,000 shares of Common Stock at 
  $.02 per share                                        $ 55,150 $     55,150 $        -  $      -  $          -  $   110,300
  Net loss for the period from inception through
   December 31, 1989                                           -            -          -         -      (359,952)    (359,952)
                                                        -------- ------------ ----------- --------- -------------  -----------
Balances at December 31, 1989                             55,150       55,150          -         -      (359,952)    (249,652)
  Issuance of 455,000 shares of Common Stock at 
   $.02 per share                                          4,550        4,550          -         -             -        9,100  
  Issuance of 10,752,222 shares of Common Stock at
   $3.00 per share, net of issuance costs of $2,513,166  107,522   29,635,979          -         -             -   29,743,501    
  Issuance of 300,000 shares of Common Stock at $3.00
   per share in payment of note to stockholders            3,000      897,000          -         -             -      900,000 
  Repurchase 60,000 shares of Common Stock at $.02 
   per share                                                (600)        (600)         -         -             -       (1,200)
  Net loss for the year ended December 31, 1990                -            -          -         -    (2,775,090)  (2,775,090)
                                                        -------- ------------ ----------- --------- -------------  -----------     
Balances at December 31, 1990                            169,622   30,592,079          -         -    (3,135,042)  27,626,659
  Issuance of 4,500,000 shares of Common Stock at $8.00
   per share, net of issuance costs of $3,230,856         45,000   32,724,144          -         -             -   32,769,144  
  Repurchase 74,000 shares of Common Stock at $.02 per
   share                                                    (740)        (740)         -         -             -       (1,480)
  Issuance of 135,000 shares of Common Stock, of which 
   75,000 shares are restricted, to Cold Spring Harbor 
   Laboratories pursuant to a collaboration agreement, at 
   fair market value of $18.50 per share                   1,350    2,496,150 (1,387,500)        -             -    1,110,000    
  Vesting of 3,750 shares of restricted Common Stock           -            -     69,375         -             -       69,375
  Issuance of 18,885 shares of Common Stock from the
   exercise of options at $3.00 per share                    189       56,466          -         -             -       56,655
  Issuance of 86,772 shares of Common Stock from the
   exercise of warrants at $3.00 per share                   868      259,448          -         -             -      260,316 
  Compensation related to options granted                      -       12,599          -         -             -       12,599
  Net loss for the year ended December 31, 1991                -            -          -         -    (6,412,786)  (6,412,786)
                                                        -------- ------------ ----------- --------- -------------  -----------  
Balances at December 31, 1991                            216,289   66,140,146 (1,318,125)        -    (9,547,828)  55,490,482  
  Issuance of 3,000,000 shares of Common Stock at $9.00
   per share, net of issuance costs of $1,780,436         30,000   25,189,564          -         -             -   25,219,564  
  Retirement of 299,561 shares of Common Stock at $8.00
   per share                                              (2,996)  (2,394,226)         -         -             -   (2,397,222)   
  Vesting of 15,000 shares of restricted Common Stock          -            -    277,500         -             -      277,500
  Issuance of 800,012 shares of Common Stock from the
   exercise of options at $3.00 per share                  8,000    2,392,035          -         -             -    2,400,035  
  Issuance of 106,800 shares of Common Stock from the 
   exercise of warrants at $3.00 per share                 1,068      319,333          -         -             -      320,401     
  Compensation related to options granted                      -       30,235          -         -             -       30,235
  Net loss for the year ended December 31, 1992                -            -          -         -    (8,312,128)  (8,312,128)
                                                        -------- ------------ ----------- --------- -------------  -----------     
Balances at December 31, 1992                            252,361   91,677,087 (1,040,625)        -   (17,859,956)  73,028,867 
                                     Page 3



                                                                                                
  Repurchase of 12,500 shares of Common Stock at $.02 
   per share                                                (125)        (215)         -         -             -         (340)
  Vesting of 15,000 shares of restricted Common Stock          -            -    277,500         -             -      277,500
  Issuance of 4,998 shares of Common Stock from the
   exercise of options at prices ranging from $3.00 to
   $8.00 per share                                            50       17,765          -         -             -       17,815
  Issuance of 59,650 shares of Common Stock from the 
   exercise of warrants at $3.00 per share                   596      178,354          -         -             -      178,950
  Issuance of 326,838 shares of Common Stock from the
   exercise of warrants in exchange for Common Stock at
   prices ranging from $5.25 to $6.10 per share            3,269       (3,269)         -         -             -            -  
  Compensation related to options granted                      -       30,235          -         -             -       30,235
  Net loss for the year ended December 31, 1993                -            -          -         -   (17,937,930) (17,937,930)
                                                        -------- ------------ ----------- --------- ------------- ------------    
Balances at December 31, 1993                            256,151   91,899,957   (763,125)        -   (35,797,886)  55,595,097     
  Issuance of 6,425,000 shares of Common Stock at $3.625
   per share, net of issuance costs of $500,072           64,250   22,726,303          -         -             -   22,790,553  
  Vesting of 15,000 shares of restricted Common Stock          -            -    277,500         -             -      277,500
  Issuance of 12,998 shares of Common Stock from the
   exercise of options at prices ranging from $3.00 to
   $8.00 per share                                           130       43,549          -         -             -       43,679
  Compensation related to options granted                      -       30,235          -         -             -       30,235
  Net unrealized loss on investment securities available
   for sale                                                    -            -          -  (968,920)            -     (968,920) 
  Net loss for the year ended December 31, 1994                -            -          -         -   (22,748,200) (22,748,200)
                                                        -------- ------------ ----------- --------- ------------- ------------   
Balances at December 31, 1994                            320,531  114,700,044   (485,625) (968,920)  (58,546,086)  55,019,944   
  Issuance costs related to sale of Common Stock in 1994       -      (56,567)         -         -             -      (56,567)
  Vesting of 15,000 shares of restricted Common Stock          -            -    277,500         -             -      277,500
  Issuance of 166,019 shares of Common Stock from the
   exercise of options at prices ranging from $4.00 to
   $7.625 per share                                        1,660      504,145          -         -             -      508,805   
  Issuance of 5,250 shares of Common Stock from exercise 
   of warrants at $3.00 per share                             53       15,480          -         -             -       15,533
  Issuance of 9,225 shares of Common Stock from the
   exercise of warrants in exchange for Common Stock at
   prices ranging from $4.95 to $5.13 per share               92          (92)         -         -             -            -
  Net unrealized gain on investment securities available
   for sale                                                    -            -          -   898,733             -      898,733  
  Net loss for the year ended December 31, 1995                -            -          -         -   (23,368,590) (23,368,590)
                                                        -------- ------------ ----------- --------- ------------- ------------    
Balances at December 31, 1995                            322,336  115,163,010   (208,125)  (70,187)  (81,914,676)  33,292,358  
  Issuance of 6,900,000 shares of Common Stock at
   $7.625 per share, net of issuance costs of
   $3,539,667                                             69,000   49,003,833          -         -             -   49,072,833  
  Vesting of 11,500 shares of restricted Common Stock          -            -    208,125         -             -      208,125
  Issuance of 284,145 shares of Common Stock from the
   exercise of options at prices ranging from $3.00 to
   $8.00 per share                                         2,841    1,073,029          -         -             -    1,075,870
  Net unrealized gain on investment securities available
   for sale                                                    -            -          -    80,477             -       80,477
  Net loss for the year ended December 31, 1996                -            -          -         -   (28,495,564) (28,495,564)
                                                        -------- ------------ ----------- --------- ------------- ------------ 
Balances at December 31, 1996                            394,176  165,273,055          -    10,290  (110,410,240)  55,267,281
  Issuance of 136,981 shares of Common Stock from the
   exercise of options at prices ranging from $3.00 to
   $8.609 per share                                        1,370      463,713          -         -             -      465,083
  Issuance of warrants                                         -    2,262,168          -         -             -    2,262,168 
  Net unrealized loss on investment securities available
   for sale                                                    -            -          -    (7,047)            -       (7,047)
  Net loss for the three months ended June 30, 1997            -            -          -         -    (1,717,455)  (1,717,455)
                                                        -------- ------------ ---------- ---------- ------------- ------------
Balances at June 30, 1997                               $395,546 $167,998,936 $        - $   3,243 $(112,127,695) $56,270,030
                                                        ======== ============ ========== ========== ============= ===========

<FN>
See accompanying notes to financial statements.
                                     Page 4           




 
                                                                        ICOS CORPORATION
                                                                 (A Development Stage Company)
                                                                    STATEMENTS OF CASH FLOWS
                                                                          (unaudited)

                                                                                                    Period from
                                                                                                    September 21,
                                                                                                        1989
                                                                                                   (incorporation)
                                                                          Six Months Ended             through
                                                                               June 30,                June 30,   
                                                                      --------------------------
                                                                          1997         1996              1997
                                                                      ------------ -------------    -------------


                                                                                              
Cash flows from operating activities:
  Net loss                                                           $ (1,717,455) $ (13,461,083)   $(112,127,695)
  Adjustments to reconcile net loss to net cash used in operating 
   activities:
    Depreciation and amortization                                       1,916,873      1,593,353       15,914,384
    Amortization of deferred rent                                               -              -         (475,000)
    Amortization of investment premiums/discounts                         349,870         48,856        1,032,566 
    (Gain) loss on sale of investment securities                           (2,190)        19,359       (1,375,096)
    Amortization of restricted stock                                            -        138,750        1,387,500
    Compensation related to stock options granted                               -              -          103,304
    Common Stock issued in payment of research and development costs            -              -        1,110,000
    Change in operating assets and liabilities:         
      Deferred research and development revenue                                 -       (500,000)               -
      Interest receivable                                                (234,182)      (250,305)        (383,586)
      Nontrade receivables                                                (45,496)       (12,954)        (138,465)
      Receivables under collaborative arrangements                     (5,477,879)             -       (5,477,879)
      Prepaid expenses                                                     80,517        168,206         (519,235)
      Accounts payable                                                    449,396     (1,289,616)       1,633,019
      Accrued payroll, benefits and other accrued expenses               (174,352)       (65,620)       1,579,921
                                                                      ------------ --------------    -------------
        Net cash used in operating activities                          (4,854,898)   (13,611,054)     (97,736,262)
                                                                      ------------ --------------    -------------
Cash flows from investing activities:
  Purchases of investment securities                                  (26,157,595)    (1,986,875)    (436,827,185)
  Maturities of investment securities                                  18,311,520      5,000,000      111,219,295
  Sales of investment securities                                       18,324,787      4,967,351      297,275,283
  Acquisitions of property and equipment                                 (769,932)    (2,452,759)     (26,805,148)
  Loan receivable from related party                                   (5,512,750)             -       (5,512,750)
  (Increase) decrease in other assets                                    (193,289)       113,647         (258,607)
                                                                      ------------ --------------    -------------  
        Net cash provided by (used in) investing activities             4,002,741      5,641,364      (60,909,112)
                                                                      ------------ --------------    -------------
Cash flows from financing activities:
  Proceeds from issuance of Common Stock                                        -     49,229,532      159,691,609
  Proceeds from exercise of options and warrants                          465,083        414,049        2,943,010
  Issuance of warrants                                                  1,500,000              -        1,500,000
  Principal payments on obligations under capital lease                         -        (44,633)      (3,589,201)
  Proceeds from note payable to stockholders                                    -              -          900,000
  Deferred rent payment received                                                -              -          475,000
  Common Stock retired                                                          -              -           (3,110)
                                                                      ------------ --------------    -------------
        Net cash provided by financing activities                       1,965,083     49,598,948      161,917,308
                                                                      ------------ --------------    -------------
        Net increase in cash and cash equivalents                       1,112,926     41,629,258        3,271,934
Cash and cash equivalents at beginning of period                        2,159,008      4,256,366                -
                                                                      ------------ --------------    -------------
Cash and cash equivalents at end of period                            $ 3,271,934   $ 45,885,624     $  3,271,934
                                                                      ============ ==============    =============


Supplemental disclosure of cash flow information:
  Cash paid for interest                                              $         -   $        364     $    959,466
Supplemental disclosure of noncash financing and investing
  activities:
    Assets acquired under capital lease obligations                             -              -        3,589,201
    Exercise of stock options funded by retirement of previously
      issued Common Stock                                                       -              -        2,397,132
    Receivable for issuance of warrants                                   762,168              -           762,168
    Common Stock issued in payment of note payable to stockholders              -              -          900,000
                                                                      ============ ==============    =============
<FN>
See accompanying notes to financial statements.
                                     Page 5

                                                                     

                                    ICOS CORPORATION
                             (A Development Stage Company)

                             NOTES TO FINANCIAL STATEMENTS

                  June 30, 1997 (unaudited) and December 31, 1996

1.  Summary of Significant Accounting Policies
    ------------------------------------------

    Basis of Presentation

     The information contained herein has been prepared in accordance with 
instructions for Form 10-Q.  In the opinion of management of ICOS Corporation
("ICOS" or the "Company"), the information reflects all adjustments necessary
to make the results of operations for the interim period a fair statement of 
such operations.  All such adjustments are of a normal recurring nature.  
Interim results are not necessarily indicative of results for a full year.  
For a presentation including all disclosures required by generally accepted 
accounting principles, these financial statements should be read in conjunction
with the audited financial statements for the year ended December 31, 1996, 
included in the Company's Annual Report on Form 10-K.

    Net Income (Loss) Per Common Share

	Net income (loss) per weighted average common share is calculated based
on the weighted average of outstanding common shares and dilutive common share
equivalents.  Common share equivalents include unexercised stock options.
     

2.  Research and Development Arrangements
    -------------------------------------
     
     Suncos
     
     The Company owns a 50% interest in Suncos Corporation, a corporation formed
for the development and commercialization of rPAF-AH.  Pursuant to the terms of 
agreements entered into with Suncos, the Company conducts certain research and
development activities on behalf of Suncos and is paid for such services at a 
negotiated rate.  For the three months and six months ended June 30, 1997, the
Company recognized research and development revenue of $3,111,881 and $4,828,868
respectively.

                                      Page 6



     ICOS Clinical Partners, L.P.

     On June 5, 1997, ICOS Clinical Partners, L.P. (the "Partnership"), an 
affiliate of the Company, closed an initial sale of interests to private
investors.  The purpose of the offering is to provide funding to the Company
for the continued development, clinical testing and commercialization of 
certain therapeutic products currently under development by the Company.

     The initial sale resulted in net proceeds to the Partnership of 
approximately $58 million, with approximately $14 million payable to the
Partnership on closing and the balance paid in installments over a three-year
period.  In connection with the closing, the Company issued warrants to
purchase an aggregate of 5,539,800 shares o the Company's Common Stock.  The
warrants are exercisable from October 1998 until May 31, 2002, at an exercise
price of $9.13 per share.  In addition, the Company will issue in June 1999,
subject to certain requirements, warrants to purchase an aggregate of 
5,539,800 shares of the Company's Common Stock.  Such additional warrants, if
issued, will be exercisable over a five-year period commencing in July 1999
at an exercise price to be determined at the time of issuance of such 
warrants, which is expected to reflect a 25% premium over the then-prevailing
market price for the Company's Common Stock.

     For the three months and six months ended June 30, 1997, the Company 
recognized revenue of $11.7 million from the Partnership, including a 
one-time payment for an exclusive license  to the technology by the 
Partnership. 

     ICOS has agreed to lend the Partnership up to $10 million in aggregate 
principal amount (the "Loan") to fund certain initial expenditures of the 
Partnership that consist primarily of organizational expenses, selling 
commissions and financial advisory and other fees.  To date, the Company has 
loaned the Partnership $5,512,750.  The Loan is full recourse to the 
Partnership and bears interest at the prime rate plus one quarter of one 
percent (0.25%).  Interest is payable on June 1, 1998, June 1, 1999 and at 
maturity on June 1, 2000, when the principal balance of the Loan will be 
payable in full.  It is anticipated that the Loan, including interest thereon, 
will be repaid from the proceeds of the installment payments on investor notes.


                                     Page 7


              MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                               AND RESULTS OF OPERATIONS

Results of Operations
- ---------------------

Overview

     The Company has discovered important mechanisms underlying directed cell 
movement, inhibition of proinflammatory mediators, and intracellular  signal
transduction that may provide broad opportunities in the treatment of 
inflammatory diseases and other serious conditions.

     Financial results for the second quarter and first six months of 1997 
reflect planned increases in operating expenses necessary for advancing multiple
product candidates through the therapeutic product development process.  
Development activities include product development, process development and the 
establishment and management of clinical trials.  The Company expects to invest
in additional clinical, regulatory, process development and product development 
efforts over the remainder of the year and in future periods.

     The Company has a deficit accumulated during the development stage from 
September 21, 1989 (incorporation) through June 30, 1997 of $112,127,695.  The 
Company's results of operations may vary significantly from quarter to quarter 
and will depend, among other factors, on the timing of certain expenses and 
payments received from certain collaborations, joint ventures and other business
relationships, as well as the progress of the Company's own research and 
development efforts.  The Company expects increased expenditures over the next 
several quarters as it continues to expand the size and number of clinical 
trials of its product candidates, continues to expand preclinical research and 
development activities in support of additional potential products, and 
initiates clinical trials of those product candidates deemed most promising.

     When used in this discussion, the words "believes," "intends," 
"anticipates," "plans to" and "expects" and similar expressions are intended to
identify forward-looking statements.  Such statements are subject to certain 
risks and uncertainties such as those associated with preclinical and clinical 
testing, governmental regulation, third-party reimbursement and manufacturing, 
all of which could cause actual results to differ materially from those 
projected.  These and other factors which could affect the Company's financial 
results are described in the Company's Annual Report on Form 10-K for the year 
ended December 31, 1996, which is filed with the Securities and Exchange 
Commission.  Readers are cautioned not to place undue reliance on these 
forward-looking statements, which speak only as of the date hereof.  The Company
undertakes no obligation to publicly release the results of any revisions to 
these forward-looking statements that may be made to reflect events or 
circumstances after the date hereof or to reflect the occurrence of 
unanticipated events.

                                     Page 8

   
Revenue

     Revenue for the quarter ended June 30, 1997 totaled $15.3 million and 
consisted of (i) $11.7 million from the Partnership, (ii) $3.1 million in cost 
reimbursement revenue from Suncos Corporation, the Company's joint venture with 
Suntory Limited of Japan ("Suntory"), and (iii) $0.5 million received under the 
Company's research and development agreement with Abbott Laboratories.  The 
revenue recognized from the Partnership consisted of a one-time payment of
$8.5 million for the license of technology being developed by the Partnership 
and cost reimbursement for development costs incurred by ICOS on behalf of the 
Partnership during the period.  Revenue for the second quarter of 1996 totaled
$0.5 million, and consisted entirely of payments received under the Company's 
agreement with Abbott Laboratories.  
	
     Revenue for the six months ended June 30, 1997 totaled $17.6 million and 
consisted of (i) $11.7 million from the Partnership, (ii) $4.9 million in 
cost reimbursement revenue from Suncos Corporation, and (iii) $1.0 million 
received under the Company's research and development agreement with Abbott 
Laboratories.  Revenue for the first six months of 1996 totaled $1.0 million, 
and consisted entirely of payments received under the Company's agreement with 
Abbott Laboratories.
     
Operating Expenses

     Total operating expenses for the quarter ended June 30, 1997 increased 34% 
to $10.4 million from $7.8 million for the  quarter ended June 30, 1996.  Total
operating expenses for the first half of 1997 increased 34% to $20.3 million 
from $15.2 million for the first half of 1996.  Research and development 
expenses for the second quarter of 1997 increased 39% to $9.8 million from $7.1 
million for the second quarter of 1996.  For the six months ended June 30, 1997,
research and development expenses increased 37% to $19.0 million from 
$13.8 million for the six months ended June 30, 1996.  The increase in 
research and development expenses was due primarily to increased costs 
associated with product development, process development, regulatory submissions
and clinical trials.  General and administrative expenses for the second quarter
of 1997 totaled $548,126 compared to $675,251 in the second quarter of 1996.  
For the first six months of 1997, general and administrative expenses totaled 
$1.3 million compared to $1.4 million for the six-month period ended 
June 30, 1996     

                                     Page 9


Other Income and Expense

     Other income primarily represents investment income earned on the Company's
investment securities.  Investment income for the second quarter of 1997 was 
$473,292 compared to $475,142 for the second quarter of 1996.  Investment income
for the six months ended June 30, 1997 increased 43% to $999,754 from $698,759 
for the six months ended June 30, 1996 as a result of higher cash and investment
balances in the first half of 1997 compared to the first half of 1996.     

Net Loss

     For the quarter ended June 30, 1997, the Company reported net income of 
$5.4 million or $0.13 per share compared to a net loss of $6.8 million or $0.19 
per share for the quarter ended June 30, 1996.  The net loss for the six months 
ended June 30, 1997 decreased 87% to $1.7 million from $13.5 million for the six
months ended June 30, 1996.  These changes are primarily the result of the 
revenues from Suncos and the Partnership.

Liquidity and Capital Resources

     The Company has financed its operations since inception through private and
public sales of Common Stock, investment income, revenue from research
collaborations, license payments and grants, and a capital lease.  Through 
June 30, 1997, the Company had raised $107.1 million in net proceeds from three 
public offerings of Common Stock, $30.8 million in net proceeds from private 
sales of Common Stock, $22.7 million in net proceeds from a Rights Offering of 
Common Stock to existing shareholders, and $5.3 million from the exercise of 
stock options and warrants.  Through June 30, 1997, the Company had earned $18.3
million in investment income and $24.5 million in license, research, and grant 
revenue.

     On June 5, 1997, ICOS Clinical Partners, L.P. (the "Partnership"), an 
affiliate of the Company, closed an initial sale of interests to private 
investors.  The purpose of the offering is to provide funding to the Company for
the continued development, clinical testing and commercialization of certain 
therapeutic products currently under development by the Company.

     The initial sale resulted in net proceeds to the Partnership of 
approximately $58 million with approximately $14 million payable to the 
Partnership on closing and the balance paid in installments over a three-year 
period.  In connection with the closing, the Company issued warrants to purchase
an aggregate of 5,539,800 shares of the Company's Common Stock.  The warrants 
are exercisable from October 1998 until May 31, 2002, at an exercise price of 
$9.13 per share.  In addition, the Company will issue in June 1999, subject to 
certain requirements, warrants to purchase an aggregate of 5,539,800 shares of 
the Company's Common Stock.  Such additional warrants, if issued, will be 
exercisable over a five-year period commencing in July 1999 at an exercise price
to be determined at the time of issuance of such warrants, which is expected to 
reflect a 25% premium over the then-prevailing market price for the Company's 
Common Stock.

                                     Page 10


     For the three months and six months ended June 30, 1997, the Company 
recognized revenue of $11.7 million from the Partnership, including a one-time 
payment for an exclusive license to the technology by the Partnership. 

     ICOS has agreed to lend the Partnership up to $10 million in aggregate 
principal amount (the "Loan") to fund certain initial expenditures of the 
Partnership that consist primarily of organizational expenses, selling 
commissions and financial advisory and other fees.  To date, the Company has 
loaned the Partnership $5,512,750.  The Loan is full recourse to the Partnership
and bears interest at the prime rate plus one quarter of one percent (0.25%). 
Interest is payable on June 1, 1998, June 1, 1999 and at maturity on 
June 1, 2000, when the principal balance of the Loan will be payable in full.  
It is anticipated that the Loan, including interest thereon, will be
repaid from the proceeds of the installment payments on Investor notes.

     At June 30, 1997, the Company had $32.3 million in cash and cash 
equivalents, investment securities, and interest receivable, a decrease of $9.5 
million from December 31, 1996.  This decrease is primarily attributable to 
increased costs associated with product development, process development, 
regulatory submissions and clinical trials.  Through June 30, 1997, the Company 
had invested a total of $28.1 million in production, laboratory and 
administrative facilities, laboratory and computer equipment, furniture, and 
leasehold improvements.  In addition, the Company has invested $2.4 million in 
land for future facilities expansion.  The Company anticipates that its 
operating expenses will continue to increase in 1997 and subsequent years as it 
adds the personnel and facilities associated with advancing several potential 
product candidates through development and clinical trials.  Foreseeable 
incremental costs may include, but are not limited to, those associated with the
Company's own product development, preclinical studies and clinical trials, 
patent filings and administrative activities.  The Company may also incur costs 
and make capital contributions under its joint venture agreement with Suntory 
related to its obligations to develop rPAF-AH.  Under provisions of the 
development agreement with Suncos Corporation, the entity formed as a joint
venture with Suntory, the Company will be reimbursed for certain of these costs,
however, there can be no assurance that all such costs will be reimbursed.  The 
Company may incur costs associated with the development of products being 
developed pursuant to the Partnership.

                                     Page 11

     In June 1997, the Company extended and expanded its collaborative 
research and development agreement with Abbott Laboratories.

     The Company has been successful in negotiating collaborations and joint 
development agreements with other parties where the work and strategies of the 
other parties complement those of the Company.  In some instances, these 
relationships may involve commitments by the Company to fund some or all of 
certain development programs.  Although corporate collaborations and joint 
ventures have provided cost reimbursement revenue to the Company in the past, 
there can be no assurance that similar sources of funds will be available to the
Company in the future.  The Company intends to expand and hire the additional 
personnel deemed necessary to continue development of its current portfolio of 
product candidates in clinical trials, as well as continuing discovery and 
preclinical research to identify additional potential drug candidates.  The 
Company anticipates that expansion of these activities will increase operating 
expenses in future quarters.  Further, incremental expenditures will be required
for additional laboratory, production and office facilities to accommodate 
activities and the personnel associated with this increased development 
activity.  All these activities will require substantial financial resources.  
Additional capital resources will be required to fund the Company's operations 
through commercialization of its first product.  As such, the Company will need 
to raise substantial additional funds for its programs.  There can be no 
assurance that the Company will be able to obtain additional resources on 
acceptable terms or in time to fund any necessary or desirable expenditures. 

     The amounts and timing of operating expenditures will depend on the 
progress of ongoing research and development of the Company's potential 
products, as well as the activities of corporate collaborators and joint venture
partners related to the collaborative research and development activities, the 
Food and Drug Administration regulatory process and other factors, many of which
are beyond the Company's control.

                                     Page 12


New Accounting Standard

     In February 1997, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 128, Earnings Per Share (Statement 128).  
This statement establishes standards for the computation, presentation, and 
disclosure of earnings per share (EPS), replacing the presentation of currently 
required Primary EPS with a presentation of Basic EPS.  It also requires dual 
presentation of Basic EPS and Diluted EPS on the face of the income statement 
for entities with complex capital structures.  Basic EPS, unlike Primary 
EPS, excludes all dilution while Diluted EPS, like the current Fully Diluted 
EPS, reflects the potential dilution that could occur from the exercise or 
conversion of securities into Common Stock or from other contracts to issue 
Common Stock.  Statement 128 is effective for financial statements for periods 
ending after December 15, 1997, including interim periods, and earlier 
application is not permitted.  When adopted, the Company will be required to
restate its EPS data for all prior periods presented.  The Company does not 
expect the impact of the adoption of this statement to be material to previously
reported EPS amounts.
     


                                     Page 13


PART II. OTHER INFORMATION

     ITEM 4: Submission of Matters to a Vote of Security Holders

     The Company held its Annual Meeting of Stockholders on May 7, 1997.  The 
     proposals voted upon and the results of the voting are as follows:

          1.  The following nominees for election as Directors, each to hold 
              office for a term as defined in the Proxy Statement and until
              their successors are duly elected and qualified, received not 
              less than 36,754,877 votes, which represent 99.3% of the shares of
              Common Stock voted.  Each Director received the number of votes 
              set opposite his or her name:
	
              Nominee                    For          Withheld
              
              Frank T. Cary           36,754,877       270,418
              James L. Ferguson       36,764,717       260,578
              Janice M. LeCocq        36,775,773       249,522
	
              The aforesaid nominees have been elected as Directors for the term
              set forth in the Proxy Statement.
		
              The following Directors are currently serving terms that expire at
              the 1998 Annual Meeting of Stockholders and until their respective
              successors are duly elected and qualified:

              William H. Gates, III
              Robert W. Pangia
              George B. Rathmann

              The following Directors are currently serving terms that expire at
              the 1999 Annual Meeting of Stockholders and until their respective
              successors are duly elected and qualified:
              
              David V. Milligan
              Alexander B. Trowbridge
              Gary L. Wilcox
              Walter B. Wriston	
	
                                     Page 14



          2.  The proposal to approve the appointment of KPMG Peat Marwick LLP 
              as the Company's independent public accountants for fiscal year 
              1997 received the following votes:

     	                       Votes
		
              For         36,864,987				
              Against         50,876				
              Withheld       109,432				

              The foregoing proposal was approved.
                                     

        ITEM 6. Exhibits and Reports on Form 8-K
		
            (a) See Exhibit Index
            (b) Current Report on Form 8-K Dated June 10, 1997

                                       Page 15


                                      SIGNATURE


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


Date: August 14, 1997                       By:/S/ GEORGE B. RATHMANN
      ----------------                         ----------------------
                                               George B. Rathmann
                                               Chairman of the Board of    
                                               Directors, Chief Executive
                                               Officer and President
                   
Date: August 14, 1997                       By:/S/ HOWARD S. MENDELSOHN
      ----------------                         ------------------------
                                               Howard S. Mendelsohn
                                               Chief Accounting Officer 

                                     Page 16

                                

                                Index to Exhibits


                                                                      Page
10.1     First Amendment to R & D Collaboration/License Agreement
         dated April 1, 1995 between Abbott Laboratories and ICOS
         Corporation                                            									#

27.1     Financial Data Schedule                                        










________________
# Confidential portions of this exhibit were filed seperately with the 
  Securities and Exchange Commission pursuant to an Application for 
  Confidential Treatment. 




                                    Page 17