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                                  UNITED STATES                    OMB APPROVAL
                                                                   -------------
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                 SCHEDULE 13G/A

                 INFORMATION STATEMENT PURSUANT TO RULE 13d-2(b)

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                               (AMENDMENT NO. 1)*

                                GERON CORPORATION
--------------------------------------------------------------------------------
                                (Name of issuer)

                    COMMON STOCK, PAR VALUE $0.001 PER SHARE
--------------------------------------------------------------------------------
                         (Title of class of securities)



                                    374163103
--------------------------------------------------------------------------------
                                 (CUSIP number)


                                 APRIL 10, 2003
--------------------------------------------------------------------------------

             (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)

|_|     Rule 13d-1(c)

|_|     Rule 13d-1(d)
------------------------     ----------------

        If this statement is filed pursuant to Rule 13d-2(b), check this box [x]


        * 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 the disclosures provided in a prior cover page.

        The  information  required in 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).


                                       1



CUSIP NO. 374163103                                          PAGE 2  OF 8  PAGES


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS


     Sage Capital Growth, Inc.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [X]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     New York

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          303,000
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            303,000
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     303,000

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     1.22%

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     CO

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       2



CUSIP NO. 374163103                                          PAGE 3  OF 8  PAGES


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS


     Mainfield Enterprises, Inc.
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [X]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     British Virgin Islands

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          303,000
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            303,000
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     303,000

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     1.22%

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     CO

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       3



ITEM 1.

        (a)    Name of Issuer:

               Geron Corporation

        (b)    Address of Issuer's Principal Executive Offices:

               230 Constitution Drive
               Menlo Park, California 94025

ITEM 2.

        (a)    Name of Persons Filing:

               Sage Capital Growth, Inc. ("SAGE")

               Mainfield Enterprises, Inc. ("MAINFIELD")

        (b)    Address of Principal Business Office:

               Sage:
               660 Madison Avenue, 18th Floor
               New York, NY 10021

               Mainfield:
               Icaza, Gonzalez-Ruiz & Aleman (BVI) Trust Limited, Wickhams Cay
               I,
               Vanterpool Plaza
               P.O. Box 873, Road Town
               Tortolla, BRITISH VIRGIN ISLANDS

        (c)    Citizenship:

               Sage:
               New York

               Mainfield:
               British Virgin Islands

        (d)    Title of Class of Securities:



               Common Stock, par value $0.001 per share

        (e)    CUSIP Number:

               374163103

                                       4



ITEM 3.    IF THIS  STATEMENT  IS  FILED  PURSUANT  TO  RULES  13d-1(b),  OR
           13d-1(b), OR 13d-2(b) OR (c), CHECK WHETHER THE PERSONS FILING ARE A:

(a)     |_|    Broker or dealer registered under Section 15 of the Exchange Act;

(b)     |_|    Bank as defined in Section 3(a)(6) of the Exchange Act;

(c)     |_|    Insurance company as defined in Section 3(a)(19) of the Exchange
               Act;

(d)     |_|    Investment company registered under Section 8 of the Investment
               Company Act;

(e)     |_|    An Investment advisor in accordance with Rule 13d-1(b)(1)(ii)(E);

(f)     |_|    An employee benefit plan of an endowment fund in accordance with
               Rule 13d-1(b)(1)(ii)(F);

(g)     |_|    A parent holding company or control person in accordance with
               Rule 13d-1(b)(1)(ii)(G);

(h)     |_|    A savings association as defined in Section 3(b) of the Federal
               Deposit Insurance Act;

(i)     |_|    A church plan that is excluded from the definition of an
               investment company under Section 3(c)(14) of the Investment
               Company Act of 1940;

(j)     |_|    Group, in accordance with Rule 13d-1(b)(1)(ii)(J).



ITEM 4.    OWNERSHIP.

        Provide the following  information  regarding  the aggregate  number and
        percentage of the class of  securities of the issuer  identified in Item
        1.

        (a)    Amount Beneficially Owned:

        (b)    Percent of Class:

        (c)    Number of shares as to which Sage has:

               (i)    Sole power to vote or to direct the vote:

               (ii)   Shared power to vote or to direct the vote:

               (iii)  Sole power to dispose or to direct the disposition of:

               (iv)   Shared power to dispose or to direct the disposition of:

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]

                                       5



ITEM 6.    OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

           Pursuant to a partnership agreement between Mainfield and Sage,
           Sage  has the power to sell or vote on behalf of Mainfield some
           or all of the shares of Common  Stock to which this  report  relates.
           Accordingly,  under Rule 13d-3(a), Sage may be deemed to be the
           beneficial owner of shares owned by Mainfield.

ITEM 7.    IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
           THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

           Inapplicable

ITEM 8.    IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

           See the Joint Filing Agreement Attached hereto as an Exhibit.

ITEM 9.    NOTICE OF DISSOLUTION OF THE GROUP.

           Inapplicable

ITEM 10.   CERTIFICATION.

           By signing below the  undersigned  certifies that, to the best of its
           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.

                                       6




                                    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.

                                                  Sage Capital Growth, Inc.


                                                  By:     /s/ Eldad Gal
                                                          --------------------
                                                  Name:   Eldad Gal
                                                  Title:  Managing Director



                                                  Mainfield Enterprises, Inc.


                                                  By:     /s/ Avi Vigder
                                                          --------------------
                                                  Name:   Avi Vigder
                                                  Title:  Authorized Signatory


                                       7



                             JOINT FILING AGREEMENT

        In accordance  with rule  13d-1(k)(1) of the Securities  Exchange Act of
1934,  as amended,  the  undersigned  hereby agree to the joint filing with each
other of the attached statement on Schedule 13G, and all amendments thereto, and
that such statement,  and all amendments  thereto,  is made on behalf of each of
them.

        IN WITNESS  WHEREOF,  the undersigned  hereby executed this agreement on
February 13, 2004.

                                                  Sage Capital Growth, Inc.


                                                  By:     /s/ Eldad Gal
                                                          --------------------
                                                  Name:   Eldad Gal
                                                  Title:  Managing Director



                                                  Mainfield Enterprises, Inc.


                                                  By:     /s/ Avi Vigder
                                                          --------------------
                                                  Name:   Avi Vigder
                                                  Title:  Authorized Signatory



                                       8