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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                                   FORM 10-K/A


                  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998

                           DUSA Pharmaceuticals, Inc.
             (Exact name of registrant as specified in its charter)

               NEW JERSEY                                        22-3103129
     State or other jurisdiction of                           (I.R.S. Employer
      incorporation or organization                          Identification No.)

    181 University Avenue, Suite 1208
        Toronto, Ontario, CANADA                                   M5H 3M7
(Address of principal executive offices)                         (Zip Code)

                         Commission File Number: 0-19777
       Registrant's telephone number, including area code: (416) 363-5059
        Securities registered pursuant to Section 12(b) of the Act: None

           Securities registered pursuant to section 12(g) of the Act:

                                  Common Stock
                                (Title of class)

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes X No

         Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 or Regulation S-K is not contained herein, and will not be contained,
to the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [ ]

         The aggregate market value of the voting stock held by non-affiliates
of the registrant computed by reference to the closing price of such stock as of
February 23, 1999 was $67,622,096.

         The number of shares of common stock outstanding of the Registrant as
of February 23, 1999 was 11,001,385.

                       DOCUMENTS INCORPORATED BY REFERENCE

         Document incorporated by reference to this Report is:

         (1)      Proxy Statement for the 1999 Annual Meeting of Shareholders

                           PART III, Items 10 through 13.
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EXHIBIT INDEX

3(a)     Certificate of Incorporation, as amended

3(b)     By-laws of the Registrant, filed as Exhibit 3(ii) to the Registrant's
         Quarterly Report on Form 10-Q for the fiscal quarter ended September
         30, 1997, and are incorporated herein by reference

4(a)     Common Stock specimen, filed as Exhibit 4.1 to the Registrant's
         Quarterly Report on Form 10-Q for the fiscal quarter ended September
         30, 1997, and are incorporated herein by reference

4(b)     Class B Warrant, filed as Exhibit 4.3 to the Registrant's Registration
         Statement on Form S-1, No. 33-43282, and is incorporated herein by
         reference

10(a)    License Agreement between the Company, PARTEQ and Draxis Health Inc.
         dated August 27, 1991, filed as Exhibit 10.1 to the Registrant's
         Registration Statement on Form S-1, No. 33-43282, and is incorporated
         herein by reference

10(b)    ALA Assignment Agreement between the Company, PARTEQ, and Draxis Health
         Inc. October 7, 1991, filed as Exhibit 10.2 to the Registrant's
         Registration Statement on Form S-1, No. 33-43282, and is incorporated
         herein by reference

10(c)    Employment Agreement of D. Geoffrey Shulman, MD, FRCPC dated October 1,
         1991, filed as Exhibit 10.4 to the Registrant's Registration Statement
         on Form S-1, No. 33-43282, and is incorporated herein by reference

10(d)    Amendment to Employment Agreement of D. Geoffrey Shulman, MD, FRCPC
         dated April 14, 1994, filed as Exhibit 10.4 to the Registrant's
         Registration Statement on Form S-2, No. 33-98030, and is incorporated
         hereby by reference

10(e)    Amended and Restated License Agreement between the Company and PARTEQ
         dated March 11, 1998, portions of Exhibit A have been omitted pursuant
         to a request for confidential treatment pursuant to Rule 24b of the
         Securities Exchange Act of 1934 and Rule 406 of the Securities Act of
         1933

10(f)    Incentive Stock Option Plan, filed as Exhibit 10.11 of Registrant's
         Registration Statement on Form S-1, No. 33-43282, and is incorporated
         herein by reference

10(g)    1994 Restricted Stock Option Plan, filed as Exhibit 1 to Registrant's
         Schedule 14A definitive Proxy Statement dated April 26, 1995, and is
         incorporated herein by reference

10(h)    1996 Omnibus Plan, as amended, filed as Exhibit 1 to Registrant's
         Schedule 14A definitive Proxy Statement dated April 27, 1998, and is
         incorporated herein by reference

10(i)    Purchase and Supply Agreement between the Company and National
         Biological Corporation dated November 5, 1998, portions of which have
         been omitted pursuant to a request for confidential treatment pursuant
         to Rule 24b of the Securities Exchange Act of 1934 and Rule 406 of the
         Securities Act of 1933.

27       Financial Data Schedule for the Registrant's Form 10-K for the period
         ending December 31, 1998
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                                   SIGNATURES

         Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

(Registrant) DUSA Pharmaceuticals, Inc.
             -----------------------------------------------

By (Signature and Title)   /s/D. Geoffrey Shulman, President
                          ----------------------------------

Date:  June 18, 1999





                                                                  
/s/D. Geoffrey Shulman             Director, Chairman of the Board,     June 18, 1999
- ------------------------------     President, Chief Executive           -------------
D. Geoffrey Shulman, MD, FRCPC     Officer and Chief Financial          Date
                                   Officer (Principal Executive,
                                   Financial, and Accounting
                                   Officer)

/s/ Ronald L. Carroll              Executive Vice President,            June 18, 1999
- ------------------------------     Chief Operating Officer              -------------
Ronald L. Carroll                                                       Date


/s/Stuart L. Marcus                Senior Vice President of             June 18, 1999
- ------------------------------     Scientific Affairs                   -------------
Stuart L. Marcus, MD, PhD                                               Date


/s/John H. Abeles                  Director                             June 18, 1999
- ------------------------------                                          -------------
John H. Abeles, MD                                                      Date


/s/James P. Doherty                Director                             June 18, 1999
- ------------------------------                                          -------------
James P. Doherty, BSc                                                   Date


/s/Jay M. Haft                     Director                             June 18, 1999
- ------------------------------                                          -------------
Jay M. Haft, Esq.                                                       Date


/s/Richard C. Lufkin               Director                             June 18, 1999
- ------------------------------                                          -------------
Richard C. Lufkin                                                       Date


                                   Secretary
- ------------------------------                                          -------------
Nanette W. Mantell, Esq.