UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549


                                SCHEDULE 13G

                 UNDER THE SECURITIES EXCHANGE ACT OF 1934

                      Progenics Pharmaceuticals, Inc.
------------------------------------------------------------------------------
                              (Name of Issuer)

                 Common Stock, par value $0.0013 per share
------------------------------------------------------------------------------
                       (Title of Class of Securities)

                                 743187106
------------------------------------------------------------------------------
                               (CUSIP Number)

                              January 21, 2005
------------------------------------------------------------------------------
          (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 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).




CUSIP NO. 743187106                     13G                  PAGE 2 OF 9 PAGES

  1   NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
                  Ziff Asset Management, 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               0
                 
     SHARES
                 6   SHARED VOTING POWER
  BENEFICIALLY
                           1,120,000
    OWNED BY

      EACH       7   SOLE DISPOSITIVE POWER
                           
   REPORTING               0

     PERSON      8   SHARED DISPOSITIVE POWER

      WITH                 1,120,000

  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,120,000

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

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

            6.50%

  12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

            PN



CUSIP NO. 743187106                     13G                  PAGE 3 OF 9 PAGES

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

  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               0
                 
     SHARES
                 6   SHARED VOTING POWER
  BENEFICIALLY
                           1,120,000
    OWNED BY

      EACH       7   SOLE DISPOSITIVE POWER
                           
   REPORTING               0

     PERSON      8   SHARED DISPOSITIVE POWER

      WITH                 1,120,000

  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,120,000

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

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

            6.50%

  12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

            CO



CUSIP NO. 743187106                     13G                  PAGE 4 OF 9 PAGES

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

  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 of America

                 5   SOLE VOTING POWER

   NUMBER OF               0
                 
     SHARES
                 6   SHARED VOTING POWER
  BENEFICIALLY
                           1,120,000
    OWNED BY

      EACH       7   SOLE DISPOSITIVE POWER
                           
   REPORTING               0

     PERSON      8   SHARED DISPOSITIVE POWER

      WITH                 1,120,000

  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,120,000

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

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

            6.50%

  12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

            IN




ITEM 1. (A) NAME OF ISSUER

Progenics Pharmaceuticals, Inc.

ITEM 1. (B) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

777 Old Saw Mill River Road
Tarrytown, NY 10591

ITEM 2. (A) NAME OF PERSON FILING

This Schedule 13G is being filed on behalf of the following persons (the
"Reporting Persons")*:

(i)   Ziff Asset Management, L.P. ("ZAM");
(ii)  PBK Holdings, Inc. ("PBK"); and
(iii) Philip B. Korsant

*     Attached as Exhibit A is a copy of an agreement among the Reporting
Persons that this Schedule 13G is being filed on behalf of each of them.

ITEM 2. (B) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE

Ziff Asset Management, L.P.
283 Greenwich Avenue
Greenwich, CT  06830

PBK Holdings, Inc.
283 Greenwich Avenue
Greenwich, CT  06830

Philip B. Korsant
283 Greenwich Avenue
Greenwich, CT  06830

ITEM 2. (C) CITIZENSHIP

See Item 4 of the attached cover pages.

ITEM 2. (D) TITLE OF CLASS OF SECURITIES

Common Stock, par value $0.0013 per share

ITEM 2. (E) CUSIP NUMBER

743187106

ITEM 3.

Not applicable as this Schedule 13G is filed pursuant to Rule 13d-1(c).





ITEM 4.     OWNERSHIP

(a)   Amount beneficially owned:

      See Item 9 of the attached cover pages.

(b)   Percent of class:

      See Item 11 of the attached cover pages.

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

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

            See Item 5 of the attached cover pages.

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

            See Item 6 of the attached cover pages.

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

            See Item 7 of the attached cover pages.

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

            See Item 8 of the attached cover pages.

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

Philip B. Korsant  shares voting and  dispositive  power over the shares of
Common Stock that he beneficially owns with ZAM, the owner of record of the
shares of Common Stock.  PBK also shares voting and dispositive  power over
the shares of Common Stock that it beneficially owns with ZAM.

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:  January 31, 2005

                                          ZIFF ASSET MANAGEMENT, L.P.
                                          By:PBK Holdings, Inc., its general
                                             partner


                                          By:/s/ DAVID GRAY                   
                                             ---------------------------------
                                             Name:  David Gray
                                             Title: Vice President

                                          PBK HOLDINGS, INC.


                                          By:/s/ DAVID GRAY
                                             ---------------------------------
                                             Name:  David Gray
                                             Title: Vice President

                                             /s/ PHILIP B. KORSANT
                                             ---------------------------------
                                                   Philip B. Korsant









                                  EXHIBIT A

      The  undersigned,  Ziff  Asset  Management,  L.P.,  a  Delaware  limited
partnership,  PBK  Holdings,  Inc.,  a  Delaware  corporation,  and  Philip B.
Korsant,  hereby agree and acknowledge  that the information  required by this
Schedule 13G, to which this  Agreement is attached as an exhibit,  is filed on
behalf  of each of them.  The  undersigned  further  agree  that  any  further
amendments  or  supplements  thereto  shall also be filed on behalf of each of
them.

Dated:  January 31, 2005

                                     ZIFF ASSET MANAGEMENT, L.P.
                                     By:PBK Holdings, Inc., its general partner

                                     By:/s/ DAVID GRAY
                                        ---------------------------------
                                        Name:  David Gray
                                        Title: Vice President

                                     PBK HOLDINGS, INC.


                                     By:/s/ DAVID GRAY
                                        ---------------------------------
                                        Name:  David Gray
                                        Title: Vice President

                                        /s/ PHILIP B. KORSANT
                                        ---------------------------------
                                               Philip B. Korsant