> **UNITED STATES
>     SECURITIES AND EXCHANGE COMMISSION
>     WASHINGTON, D.C. 20549** **SCHEDULE 13G** **UNDER THE SECURITIES EXCHANGE ACT OF 1934
>     (Amendment No. 1)*** **CLOVIS ONCOLOGY, INC.**
>     (Name of Issuer)
>     Common Stock, $0.001 par value per share 
>     (Title of Class of Securities)
>     189464100
>     (CUSIP Number)
>     12/31/2012
>     (Date of Event Which Requires Filing of this Statement)
>   Check the appropriate  box to designate the rule pursuant to which this Schedule
>     is filed:
>     |_| Rule 13d-1(b)
>     |X| Rule 13d-1(c)
>     |_| Rule 13d-1(d)
>     *The remainder of this  cover page shall be filled out for a reporting person's initial filing on this  form with respect to the subject class of securities, and for any subsequent  amendment containing information which would alter disclosures provided in a  prior cover page.
>     The information required  on the remainder of this cover page shall not be deemed to be "filed"  for the purpose of Section 18 of the Securities Exchange Act of 1934  ("Act") or otherwise subject to the liabilities of that section of the  Act but shall be subject to all other provisions of the Act (however, see the  Notes).
>   CUSIP No.
>     189464100
>     --------------------------------------------------------------------------------
>     1) Names of Reporting  Persons. PFIZER INC.
>     I.R.S. Identification Nos. of Above Persons (entities only) 13-5315170
>     --------------------------------------------------------------------------------
>     2) Check the Appropriate  Box if a Member of a Group (See Instructions)
>     (a) |_|
>     (b) |_|
>     --------------------------------------------------------------------------------
>     3) SEC Use Only
>     --------------------------------------------------------------------------------
>     4) Citizenship or Place  of Organization
>     Delaware
>     --------------------------------------------------------------------------------
>   NUMBER OF
>         SHARES 
>         BENEFICIALLY 
>         OWNED BY EACH    REPORTING
>       PERSON WITH:
>       5. Sole Voting Power       1,181,1906. Shared Voting Power    -0-7. Sole Dispositive    Power  1,181,1908. Shared Dispositive    Power -0---------------------------------------------------------------------------------
>     9) Aggregate Amount  Beneficially Owned by Each Reporting Person  1,181,190
>     10) Check if the  Aggregate Amount in Row (9) Excludes Certain Shares
>     (See Instructions) |_|
>     11) Percent of Class  Represented by Amount in Item 9    4.52%
>     12) Type of Reporting  Person (See Instructions)   CO
>     ITEM 1.
>     (A) NAME OF ISSUER: Clovis  Oncology, Inc.
>     (B) ADDRESS OF ISSUER'S  PRINCIPAL EXECUTIVE OFFICE:
>     2525 28th Street,  Suite 100 Boulder, Colorado 80301 
>     ITEM 2.
>     (A) NAME OF PERSONS  FILING: PFIZER INC.
>     (B) ADDRESS OF PRINCIPAL  BUSINESS OFFICE OR IF NONE, RESIDENCE:
>     235 E. 42nd Street, New York, NY 10017
>     (C) CITIZENSHIP:  DELAWARE, U.S.A.
>     (D) TITLE OF CLASS OF  SECURITIES: COMMON STOCK
>     (E) CUSIP NUMBER:  189464100
>     ITEM 3. STATEMENT FILED  PURSUANT TO RULE 13D-1(B) OR 13D-2(B) OR (C)
>     Not applicable. 
>     ITEM 4. OWNERSHIP.
>     (a) Amount beneficially  owned: 1,181,190
>     (b) Percent of class: 4.52%
>     (c) Number of shares as  to which the person has: 
>      (i) Sole power to vote  or to direct the vote:  1,181,190
>      (ii) Shared power to  vote or to direct the vote: - 0-
>      (iii) Sole power to  dispose or to direct the disposition of:  1,181,190
>      (iv) Shared power to  dispose or to direct the disposition of:   - 0-
>   ITEM 5. OWNERSHIP OF  FIVE PERCENT OR LESS OF A CLASS
>     If this statement is being filed to report the fact that as  of the date hereof
> the reporting person has ceased to be the beneficial owner of more than five
> percent of the class of securities, check the following |**X**|.
>     ITEM 6. OWNERSHIP OF  MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
>     Not applicable.
>     ITEM 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE  SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
>     Not applicable.
>     ITEM 8. IDENTIFICATION  AND CLASSIFICATION OF MEMBERS OF THE GROUP
>     Not applicable.
>     ITEM 9. NOTICE OF  DISSOLUTION OF GROUP
>     Not applicable.
>     ITEM 10. CERTIFICATION.
>   By signing below I  certify that, to the best of my knowledge and belief, the securities referred  to above were not acquired and are not held for the purpose of or with the  effect of changing or influencing the control of the issuer of the securities  and were not acquired and are not held in connection with or as a participant  in any transaction having that purpose or effect.
>   **Signature**
>   After reasonable inquiry and to the best of my knowledge and belief, I certify  that the information set forth in this statement is true, complete and correct.
>     Dated: February 14, 2013
>     PFIZER INC. 
>     By:/s/ Susan Grant
>     Name: Susan Grant
>   Title: Assistant Secretary

>