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      SECURITIES AND EXCHANGE COMMISSION        |------------------------------|
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                                  SCHEDULE 13G
                                 (Rule 13d-102)

  INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c),
         AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b)

                               (Amendment No. 1 )*

                           Exact Sciences Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    30063P105
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 2002
--------------------------------------------------------------------------------
             (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)

    [X] 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 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).

                               Page 1 of 16 pages



-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 2 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        One Liberty Fund III, L.P.

--------------------------------------------------------------------------------
  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

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER


                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                726,999
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH

                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                726,999

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        726,999

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        3.82%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        PN

--------------------------------------------------------------------------------


                               Page 2 of 16 pages



-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 3 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        OneLiberty Partners III, L.P.

--------------------------------------------------------------------------------
  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

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER


                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                726,999
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH

                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                726,999

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        726,999

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        3.82%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        PN

--------------------------------------------------------------------------------


                               Page 3 of 16 pages




-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 4 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        OneLiberty Fund IV, L.P.

--------------------------------------------------------------------------------
  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

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER


                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                475,794
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH

                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                475,794

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        475,794

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        2.5%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        PN

--------------------------------------------------------------------------------


                               Page 4 of 16 pages




-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 5 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        OneLiberty Advisors Fund IV, L.P.

--------------------------------------------------------------------------------
  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

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER


                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                475,794
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH

                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                475,794

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        475,794

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        2.5%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        PN

--------------------------------------------------------------------------------


                               Page 5 of 16 pages



-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 6 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        OneLiberty Partners IV, LLC

--------------------------------------------------------------------------------
  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

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER


                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                475,794
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH

                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                475,794

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        475,794

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        2.5%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        OO

--------------------------------------------------------------------------------


                               Page 6 of 16 pages




-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 7 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        Stephen J. Ricci

--------------------------------------------------------------------------------
  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

        United States

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER

                                42,500
                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,202,793
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH
                                42,500
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,202,793

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,245,293

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.54%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        IN

--------------------------------------------------------------------------------


                               Page 7 of 16 pages




-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 8 of 16
-------------------                                               ------------

--------------------------------------------------------------------------------

  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


        Edwin M. Kania, Jr.

--------------------------------------------------------------------------------
  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

        United States

--------------------------------------------------------------------------------

                           5    SOLE VOTING POWER

                                95,146
                           -----------------------------------------------------
       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,202,793
          EACH
       REPORTING           -----------------------------------------------------
         PERSON            7    SOLE DISPOSITIVE POWER
          WITH
                                95,146
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,202,793

--------------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,297,939

--------------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
        (SEE INSTRUCTIONS)  [_]


--------------------------------------------------------------------------------

 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.81%

--------------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

        IN

--------------------------------------------------------------------------------


                               Page 8 of 16 pages



-------------------                                               ------------
CUSIP No. 30063P105                  13G                          Page 9 of 16
-------------------                                               ------------

                         Amendment No. 1 to Schedule 13G

Item 1(a).        Name of Issuer:  Exact Sciences Corporation

Item 1(b).        Address of Issuer's Principal Executive Offices:
                  63 Great Road, Maynard, MA 01754

Item 2(a).        Names of Persons Filing:  (1) One Liberty Fund III, L.P.
                  ("Fund III"); (2) OneLiberty Partners III, L.P. ("Partners
                  III"); (3) OneLiberty Fund IV, L.P. ("Fund IV"); (4)
                  OneLiberty Partners IV, LLC ("Partners IV"); (5) OneLiberty
                  Advisors Fund IV, L.P. ("Advisors IV"); (6) Edwin M. Kania,
                  Jr. ("Kania") and (7) Stephen J. Ricci ("Ricci"). Ricci and
                  Kania are the general partners of Partners III and the
                  individual managing members of Partners IV. Partners III is
                  the general partner of Fund III. Partners IV is the general
                  partner of each of Fund IV and Advisors IV.

Item 2(b).        Address of Principal Business Office or, if None, Residence:
                  The address of the principal business office of each of Fund
                  III, Partners III, Fund IV, Partners IV, Advisors IV, Kania
                  and Ricci is c/o Flagship Ventures, 150 CambridgePark Drive,
                  Cambridge, MA 02140.

Item 2(c).        Citizenship: Each of Fund III, Partners III, Fund IV and
                  Advisors IV is a limited partnership organized under the laws
                  of the state of Delaware. Partners IV is a limited liability
                  company organized under the laws of the state of Delaware.
                  Each of Kania and Ricci is a United States citizen.

Item 2(d).        Title of Class of Securities:  Common Stock, $.01 par value
                  per share

Item 2(e).        CUSIP Number:  30063P105

Item 3.           If this statement if filed pursuant to Rule 13d-1(b), or
                  13d-2(b) or (c), check whether the person filing is a:

                  Not Applicable.

Item 4.           Ownership.

                  (a)   Amount Beneficially Owned:

                  As of December 31, 2002, Fund III is the record holder of
                  726,999 shares of Common Stock. As of December 31, 2002,
                  Partners III does not hold any shares of Common Stock, but as
                  general partner of Fund III, Partners III may be deemed to own
                  beneficially 726,999 shares of Common Stock. As of December
                  31, 2002, Fund IV is the record holder of 465,099 shares of
                  Common Stock. As of December 31, 2002, Advisors IV is the
                  record holder of 10,695 shares of Common Stock. As of December
                  31, 2002, Partners IV does not hold any shares of Common
                  Stock, but as general partner of Fund IV and Advisors IV, may
                  be deemed to own beneficially 475,794 shares of Common Stock.
                  By virtue of their relationship as affiliated limited
                  partnerships that have an

                               Page 9 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 10 of 16
-------------------                                               -------------



                  overlapping general partner, Partners IV, each of Fund IV and
                  Advisors IV may be deemed to own beneficially 475,794 shares
                  of Common Stock. Kania is also the record owner of stock
                  options to purchase 17,917 shares of Common Stock exercisable
                  within 60 days of December 31, 2002. Kania is also record
                  owner of 77,299 shares of Common Stock. In his capacity as a
                  managing member of Partners IV and general partner of Partners
                  III, Kania may be deemed to beneficially own 1,297,939 shares
                  of Common Stock. Ricci is record holder of 42,500 shares. In
                  his capacity as a managing member of Partners IV and general
                  partner of Partners III, Ricci may be deemed to beneficially
                  own 1,245,293 shares of Common Stock. Each reporting person
                  expressly disclaims beneficial ownership, except to the extent
                  of his or its pecuniary interest therein, if any, of the
                  shares of Common Stock, except in the case of (i) Fund III for
                  the 726,999 shares of Common Stock which it holds of record,
                  (ii) Fund IV for the 465,099 shares of Common Stock which it
                  holds of record, (iii) Advisors IV for the 10,695 shares of
                  Common Stock which it holds of record, (iv) Kania for the
                  options to purchase 17,917 shares of Common Stock which he
                  holds of record and the 77,229 shares of Common Stock which he
                  holds of record and Ricci for the 42,500 shares of Common
                  Stock which he holds of record.
                  (b) Percent of Class:
                            One Liberty Fund III, L.P.:  3.82%
                            OneLiberty Partners III, L.P.:  3.82%
                            OneLiberty Fund IV, L.P.:  2.5%
                            OneLiberty Partners IV, LLC:  2.5%
                            OneLiberty Advisors Fund IV, L.P.:  2.5%
                            Stephen J. Ricci:  6.54%
                            Edwin M. Kania, Jr.:  6.81%


                    The foregoing percentages are calculated based on the
                    19,048,067 shares of Common Stock reported to be outstanding
                    as of September 30, 2002, in the Issuer's Form 10-Q filed on
                    November 14, 2002, as adjusted pursuant to Rule 13d-3(d)(1).

                  (c) Number of shares as to which such person has:

                        (i)    sole power to vote or to direct the vote: 0
                               shares for each reporting person except for Ricci
                               and Kania. For Ricci, 42,500 shares of Common
                               Stock, and for Kania, 17,917 shares of Common
                               Stock which may be purchased pursuant to stock
                               options exercisable within 60 days of December
                               31, 2002 and 77,229 shares of Common Stock.

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

                               One Liberty Fund III, L.P.:  726,999 shares
                               OneLiberty Partners III, L.P.:  726,999 shares
                               OneLiberty Fund IV, L.P.:  475,794 shares
                               OneLiberty Partners IV, LLC:  475,794 shares
                               OneLiberty Advisors Fund IV, L.P.: 475,794 shares
                               Stephen J. Ricci:  1,202,793 shares
                               Edwin M. Kania, Jr.:  1,202,793 shares


                              Page 10 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 11 of 16
-------------------                                               -------------


                        (iii)  sole power to dispose or direct the disposition
                               of: 0 shares for each reporting person except for
                               Ricci and Kania. For Ricci, 42,500 shares of
                               Common Stock, and for Kania, 17,917 shares of
                               Common Stock which may be purchased pursuant to
                               stock options exercisable within 60 days of
                               December 31, 2002 and 77,229 shares of Common
                               Stock.

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

                               One Liberty Fund III, L.P.:  726,999 shares
                               OneLiberty Partners III, L.P.:  726,999 shares
                               OneLiberty Fund IV, L.P.:  475,794 shares
                               OneLiberty Partners IV, LLC:  475,794 shares
                               OneLiberty Advisors Fund IV, L.P.: 475,794 shares
                               Stephen J. Ricci:  1,202,793 shares
                               Edwin M. Kania, Jr.:  1,202,793 shares


Item 5.           Ownership of Five Percent or Less of a Class.

                  Not Applicable.

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 or Control Person.

                  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.          Certifications.

                  Not Applicable. This statement on Schedule 13G is not filed
                  pursuant to Rule 13d-1(b) or Rule 13d-1(c).


                              Page 11 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 12 of 16
-------------------                                               -------------


                                    SIGNATURE

        After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Date: February 13, 2003

ONE LIBERTY FUND III, L.P.

By:   OneLiberty Partners III, L.P.
      Its General Partner

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      General Partner


ONELIBERTY PARTNERS III, L.P.

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      General Partner


ONELIBERTY FUND IV, L.P.

By:   OneLiberty Partners IV, LLC
      Its General Partner

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      General Partner


ONELIBERTY ADVISORS FUND IV, L.P.

By:   OneLiberty Partners IV, LLC
      Its General Partner

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      Managing Member


ONELIBERTY PARTNERS IV, LLC

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      Managing Member



                              Page 12 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 13 of 16
-------------------                                               -------------


STEPHEN J. RICCI

                            *
--------------------------------------------------


EDWIN M. KANIA, JR.

                            *
--------------------------------------------------

*    The undersigned attorney-in-fact, by signing his name below, does hereby
     sign this statement on behalf of the above indicated filers pursuant to
     Powers of Attorney filed hereto as Exhibit II.

/s/ Edwin M. Kania, Jr.
--------------------------------------------------
Edwin M. Kania, Jr.
Attorney-in-Fact


                              Page 13 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 14 of 16
-------------------                                               -------------

                                                                       Exhibit I

                                    AGREEMENT

        Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of stock of Exact Sciences Corporation.

        EXECUTED this 13th day of February, 2003.

ONE LIBERTY FUND III, L.P.

By:   OneLiberty Partners III, L.P.
      Its General Partner

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      General Partner


ONELIBERTY PARTNERS III, L.P.

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      General Partner


ONELIBERTY FUND IV, L.P.

By:   OneLiberty Partners IV, LLC
      Its General Partner

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      General Partner


ONELIBERTY ADVISORS FUND IV, L.P.

By:   OneLiberty Partners IV, LLC
      Its General Partner

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      Managing Member


ONELIBERTY PARTNERS IV, LLC

      By:                   *
         -----------------------------------------
      Edwin M. Kania, Jr.
      Managing Member

                              Page 14 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 15 of 16
-------------------                                               -------------



STEPHEN J. RICCI

                            *
--------------------------------------------------


EDWIN M. KANIA, JR.

                            *
--------------------------------------------------


*    The undersigned attorney-in-fact, by signing his name below, does hereby
     sign this statement on behalf of the above indicated filers pursuant to
     Powers of Attorney filed hereto as Exhibit II.

/s/ Edwin M. Kania, Jr.
--------------------------------------------------
Edwin M. Kania, Jr.
Attorney-in-Fact





                              Page 15 of 16 pages



-------------------                                               -------------
CUSIP No. 30063P105                  13G                          Page 16 of 16
-------------------                                               -------------

                                                                      Exhibit II

                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Stephen J. Ricci and Edwin M. Kania, Jr.,
and each of them, with full power to act without the other, his true and lawful
attorney-in-fact, with full power of substitution, to sign any and all
instruments, certificates and documents that may be necessary, desirable or
appropriate to be executed on behalf of himself as an individual or in his
capacity as general partner or managing member of any partnership or limited
liability company, pursuant to section 13 or 16 of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), and any and all regulations
promulgated thereunder, and to file the same, with all exhibits thereto, and any
other documents in connection therewith, with the Securities and Exchange
Commission, and with any other entity when and if such is mandated by the
Exchange Act or by the By-laws of the National Association of Securities
Dealers, Inc., granting unto said attorney-in-fact full power and authority to
do and perform each and every act and thing necessary, desirable or appropriate,
fully to all intents and purposes as he might or could do in person, thereby
ratifying and confirming all that said attorney-in-fact, or his substitutes, may
lawfully do or cause to be done by virtue hereof.

     IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 16th
day of February, 2001.

                                               /s/ Stephen J. Ricci
                                               ---------------------------------
                                               Stephen J. Ricci

                                               /s/  Edwin M. Kania, Jr.
                                               ---------------------------------
                                               Edwin M. Kania, Jr.

                              Page 16 of 16 pages