ADVENT INTERNATIONAL CORP ET AL
SC 13G, 1998-02-13
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. )*


                               ILEX ONCOLOGY, INC.
         ----------------------------------------------------------
                                (Name of Issuer)


                          COMMON STOCK, PAR VALUE $0.01
           ----------------------------------------------------------
                         (Title of Class of Securities)


                                   451923-10-6
         ----------------------------------------------------------
                                 (CUSIP Number)

Check the following box if a fee is being paid with this statement [ ]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*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>   2




CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 2 of 11


- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Advent International Corporation
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [X]
                                                               (b)   [ ]

- --------------------------------------------------------------------------------
3.      SEC USE ONLY


- --------------------------------------------------------------------------------
4.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                   5.     SOLE VOTING POWER
                          
                          668,468
    NUMBER OF      -------------------------------------------------------------
      SHARES       6.     SHARED VOTING POWER
   BENEFICIALLY           
     OWNED BY             None
       EACH        -------------------------------------------------------------
    REPORTING      7.     SOLE DISPOSITIVE POWER
      PERSON              
       WITH               668,468
                   -------------------------------------------------------------
                   8.     SHARED DISPOSITIVE POWER
                          
                          None
- --------------------------------------------------------------------------------
9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        
        668,468
- --------------------------------------------------------------------------------
10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*                                                      [ ]

- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        
        5.6%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON*
        
        CO, IA
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!



<PAGE>   3


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 3 of 11


- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Advent International Limited Partnership
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [X]
                                                               (b)   [ ]

- --------------------------------------------------------------------------------
3.      SEC USE ONLY


- --------------------------------------------------------------------------------
4.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                   5.     SOLE VOTING POWER
                          
                          687,040
    NUMBER OF      -------------------------------------------------------------
      SHARES       6.     SHARED VOTING POWER
   BENEFICIALLY           
     OWNED BY             None
       EACH        -------------------------------------------------------------
    REPORTING      7.     SOLE DISPOSITIVE POWER
      PERSON              
       WITH               687,040
                   -------------------------------------------------------------
                   8.     SHARED DISPOSITIVE POWER
                          
                          None
- --------------------------------------------------------------------------------
9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        
        687,040
- --------------------------------------------------------------------------------
10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*                                                      [ ]

- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        
        5.6%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON*
        
        PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   4


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 4 of 11


- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Advent Limited Partnership
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [X]
                                                               (b)   [ ]

- --------------------------------------------------------------------------------
3.      SEC USE ONLY


- --------------------------------------------------------------------------------
4.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                   5.     SOLE VOTING POWER
                          
                          86,096
    NUMBER OF      -------------------------------------------------------------
      SHARES       6.     SHARED VOTING POWER
   BENEFICIALLY           
     OWNED BY             None
       EACH        -------------------------------------------------------------
    REPORTING      7.     SOLE DISPOSITIVE POWER
      PERSON              
       WITH               86,096
                   -------------------------------------------------------------
                   8.     SHARED DISPOSITIVE POWER
                          
                          None
- --------------------------------------------------------------------------------
9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        
        86,096
- --------------------------------------------------------------------------------
10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*                                                      [ ]

- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        
        0.7%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON*
        
        PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   5


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 5 of 11


- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Rovent II Limited Partnership
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [X]
                                                               (b)   [ ]

- --------------------------------------------------------------------------------
3.      SEC USE ONLY


- --------------------------------------------------------------------------------
4.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                   5.     SOLE VOTING POWER
                          
                          428,753
    NUMBER OF      -------------------------------------------------------------
      SHARES       6.     SHARED VOTING POWER
   BENEFICIALLY           
     OWNED BY             None
       EACH        -------------------------------------------------------------
    REPORTING      7.     SOLE DISPOSITIVE POWER
      PERSON              
       WITH               428,753
                   -------------------------------------------------------------
                   8.     SHARED DISPOSITIVE POWER
                          
                          None
- --------------------------------------------------------------------------------
9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        
        428,753
- --------------------------------------------------------------------------------
10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*                                                      [ ]

- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        
        3.5%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON*
        
        CO, IA
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   6




CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 6 of 11


- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Advent Performance Materials Limited Partnership
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [X]
                                                               (b)   [ ]

- --------------------------------------------------------------------------------
3.      SEC USE ONLY


- --------------------------------------------------------------------------------
4.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                   5.     SOLE VOTING POWER
                          
                          172,191
    NUMBER OF      -------------------------------------------------------------
      SHARES       6.     SHARED VOTING POWER
   BENEFICIALLY           
     OWNED BY             None
       EACH        -------------------------------------------------------------
    REPORTING      7.     SOLE DISPOSITIVE POWER
      PERSON              
       WITH               172,191
                   -------------------------------------------------------------
                   8.     SHARED DISPOSITIVE POWER
                          
                          None
- --------------------------------------------------------------------------------
9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        
        172,191
- --------------------------------------------------------------------------------
10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*                                                      [ ]

- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        
        1.4%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON*
        
        PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!



<PAGE>   7




CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 7 of 11


- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Advent International Investors II Limited Partnership
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [X]
                                                               (b)   [ ]

- --------------------------------------------------------------------------------
3.      SEC USE ONLY


- --------------------------------------------------------------------------------
4.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Massachusetts
- --------------------------------------------------------------------------------
                   5.     SOLE VOTING POWER
                          
                          1,428
    NUMBER OF      -------------------------------------------------------------
      SHARES       6.     SHARED VOTING POWER
   BENEFICIALLY           
     OWNED BY             None
       EACH        -------------------------------------------------------------
    REPORTING      7.     SOLE DISPOSITIVE POWER
      PERSON              
       WITH               1,428
                   -------------------------------------------------------------
                   8.     SHARED DISPOSITIVE POWER
                          
                          None
- --------------------------------------------------------------------------------
9.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        
        1,428
- --------------------------------------------------------------------------------
10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES*                                                      [ ]

- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
        
        0.0%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON*
        
        PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!



<PAGE>   8


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 8 of 11


ITEM 1.

         (a) (b) This statement on Schedule 13G relates to the Reporting
Persons' (as defined in Item 2 below) beneficial ownership interest in ILEX
Oncology, Inc. a Delaware corporation (the "Corporation"). The address of the
principal executive office of the Corporation is 11550 I.H. 10 West, Suite 300,
San Antonio, Texas 78230.

ITEM 2.

         (a) (b) (c)   This statement is being filed by the following entities:

                 (1)   Advent International Corporation, a Delaware corporation;

                 (2)   Advent International Limited Partnership, a Delaware
                       limited partnership;

                 (3)   Rovent II Limited Partnership, a Delaware limited 
                       partnership;

                 (4)   Advent Performance Materials Limited Partnership, a 
                       Delaware limited partnership;

                 (5)   Advent International Investors II Limited Partnership, a 
                       Massachusetts limited partnership;

         The entities listed in subparagraph (1) through (5) above are herein
collectively referred to as the "Reporting Persons" and individually as a
"Reporting Person." The principal business address of all of the Reporting
Persons is c/o Advent International Corporation, 101 Federal Street, Boston, MA
02110.

         (d) (e) This statement relates to the Common Stock, par value $0.01 per
share, (the "Common Stock") of the Corporation named in Item 1 of this
statement. The CUSIP number associated with such Common Stock is 451923-10-6.

               (THE REMAINDER OF THIS PAGE INTENTIALLY LEFT BLANK)


<PAGE>   9


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 9 of 11


ITEM 3.  FILING PURSUANT TO RULE 13G-1(b), OR 13G-2(b).

         This statement is not being filed pursuant to Rule 13G-1(b), or
13G-2(b).


ITEM 4.  OWNERSHIP.

         (a) (b) The following table sets forth the aggregate number and
percentage (based upon the number of shares of Common Stock outstanding as of
December 31, 1997) of the Common Stock beneficially owned by each Reporting
Person named in Item 2 of this statement. The aggregate number and percentage of
the Common Stock beneficially owned by each Reporting Person is calculated in
accordance with Rule 13G-3(d)(1).

<TABLE>
<CAPTION>

                                           NUMBER OF SHARES     
                                    -----------------------------     PERCENTAGE   
                                                UNDER                 OF SHARES
REPORTING PERSON                    COMMON    WARRANTS     TOTAL     OUTSTANDING
- ---------------------------------   --------------------------------------------
<S>                                 <C>         <C>       <C>          <C> 
ADVENTACT Limited Partnership (1)   83,149       2,947     86,096       0.7%
Rovent II Limited Partnership (1)   414,080     14,673    428,753       3.5%
Advent Performance Materials
   Limited Partnership              166,293      5,893    172,191       1.4%
                                    -------     ------    -------
Advent International Limited
Partnership (1)                     663,527     23,513    687,040       5.6%
Advent International Investors II
   Limited Partnership (2)            1,428          0      1,428       0.0%
                                    -------     ------    -------       ----
Advent International Corporation    664,955     23,513    688,468       5.6%
                                    =======     ======    =======       ====

Total Group Ownership               664,955     23,513    688,468       5.6%
                                    =======     ======    =======       ====

</TABLE>

         (1) Advent International Corporation ("AIC") is the General Partner of
Advent International Limited Partnership ("AILP") which in turn is the General
Partner of the indicated reporting persons. As such, AIC has the sole power to
vote and dispose of the securities owned by the indicated reporting persons. The
beneficial ownership of AIC and AILP derive from such power.

         (2) AIC is the General Partner of Advent International Investors II
Limited Partnership ("AI Investors II"). As such, AIC has the power to vote and
dispose of the securities of AI Investors II. The beneficial ownership of AIC
derives from such power.

         (c) Each of the Reporting Persons listed in the table set forth above
has sole voting and dispositive power over the Common Stock beneficially owned
by it as indicated above.

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

                  Not Applicable.


<PAGE>   10


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 10 of 11


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.

         The information for this item is contained on the individual cover
pages to this filing, and is incorporated herein by reference.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP.

                  Not Applicable.

ITEM 10. CERTIFICATION.

                  By signing below we certify that, to the best of our knowledge
and belief, the securities referred to above were acquired in the ordinary
course of business and were not acquired for the purpose of and do not have the
effect of changing or influencing the control of the issuer of such securities
and were not acquired in connection with or as a participant in any transaction
having such purposes or effect.


                                    SIGNATURE

                  After reasonable inquiry and to the best of our knowledge and
belief, we certify that the information set forth in this statement is true,
complete and correct.


February 11, 1998


ADVENT INTERNATIONAL CORPORATION
By:      Janet L. Hennessy
         Vice President                       /s/ Janet L. Hennessy
                                              ----------------------------------


ADVENT INTERNATIONAL LIMITED PARTNERSHIP
By:      Advent International Corporation,
         General Partner
By:      Janet L. Hennessy
         Vice President                       /s/ Janet L. Hennessey
                                              ----------------------------------


<PAGE>   11


CUSIP NO. 451923-10-6            SCHEDULE 13G                      Page 11 of 11


ADVENTACT LIMITED PARTNERSHIP
By:      Advent International Limited Partnership,
         General Partner
By:      Advent International Corporation,
         General Partner
By:      Janet L. Hennessy
         Vice President                     /s/ Janet L. Hennessey
                                            ------------------------------------

ADVENT PERFORMANCE MATERIALS LIMITED PARTNERSHIP
By:      Advent International Limited Partnership,
         General Partner
By:      Advent International Corporation,
         General Partner
By:      Janet L. Hennessy
         Vice President                     /s/ Janet L. Hennessey
                                            ------------------------------------

ROVENT II LIMITED PARTNERSHIP
By:      Advent International Limited Partnership,
         General Partner
By:      Advent International Corporation,
         General Partner
By:      Janet L. Hennessy
         Vice President                     /s/ Janet L. Hennessey
                                            ------------------------------------

ADVENT INTERNATIONAL INVESTORS II LIMITED PARTNERSHIP
By:      Advent International Corporation,
         General Partner
By:      Janet L. Hennessy
         Vice President                     /s/ Janet L. Hennessey
                                            ------------------------------------




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