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

                                  SCHEDULE 13D/A

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 4)*


                       Healthcore Medical Solutions, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


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


                                    42220B101
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                Adam D. Eilenberg
                    Ehrenreich Eilenberg Krause & Zivian LLP
                         11 East 44th Street, 17th Floor
                              New York, N.Y. 10017
                                 (212) 986-9700
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                                 April 14, 1999
- --------------------------------------------------------------------------------
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously  filed a statement of Schedule 13G to report
the  acquisition  which is the subject of the  Schedule  13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder  of this cover page shall be filed 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 on 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).

                        (Continued on following page(s))





CUSIP No.   42220B101                 13D


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



                           SIGA Pharmaceuticals, Inc.
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [ ]
                                                             (b)  [ ]


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




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*



                                       WC
- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION


                                       DE
- --------------------------------------------------------------------------------
                  7    SOLE VOTING POWER
   NUMBER OF           113,800 (including 56,300 Warrants     
     SHARES                     exercisable at $6.50 per share)
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH             0
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH             113,800 (including 56,300 Warrants 
                                exercisable at $6.50 per share)
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                       0


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       113,800 (including 56,300 Warrants exercisable at $6.50 per share)
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

       
       1.91% (taking into account only shares of Common Stock; 3.70% if also
              including 56,300 Warrants exercisable at $6.50 per share)
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*

       

                                       CO
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No.  42220B101                   13D                   

                                  Schedule 13D


Item 1. Security and Issuer

This  statement  relates to the Class A Common  Stock,  $.01 par value  ("Common
Stock"),  of Healthcore  Medical Solutions,  Inc. (the "Issuer"),  which has its
principal executive office at 11904 Blue Ridge Boulevard, Grandview, MO 64030.

This  statement is filed  pursuant to Rule  13d-2(a)  with respect to securities
owned by the reporting  person  specified herein as of April 14, 1999 and amends
the  Schedule 13 D filed on October 15, 1998,  Amendment  No. 1 filed on January
11, 1999,  Amendment  No. 2 filed on Feburary 26, 1999 and Amendment No. 3 filed
on March 18, 1999 (collectively the "Schedule 13D"). Except as set forth herein,
the Schedule 13D is hereby restated in its entirety.

Item 3. Source of Funds or Other Consideration

Between  March 25,  1999 and April  14,  1999,  the  Reporting  Person  made the
following  open market  sales of an  aggregate  of 37,500  units of the Issuer's
securities ("Units"),  each Unit consisting of one share of Common Stock and one
currently  exercisable  Warrant (the  "Warrant") to purchase one share of Common
Stock (at an exercise price of $6.50 per share):

Date                     No. Units Sold                     Sale Price per Unit

3/25/99                      1,000                                 $1.09375
4/7/99                       2,000                                 $1.03125
4/7/99                       3,000                                 $1.0625
4/7/99                       2,500                                 $1.125
4/13/99                      2,000                                 $1.125
4/14/99                     10,000                                 $1.125
4/14/99                     12,500                                 $1.25
4/14/99                      5,000                                 $1.3125
                         
TOTAL                       37,500
                      
The  Reporting  Person  currently  holds 57,500  shares of Common  Stock,  which
represents  only  1.91% of the class of Common  Stock.  However,  the  Reporting
Person also holds the 56,300 Warrants that are included in the Units,  which are
currently  exercisable,  even  though  the  exercise  price of the  Warrants  is
substantially  in excess of the current  market price for the Common Stock.  The
Reporting  Person  currently has no intention of exercising any of the Warrants.
When the shares of Common  Stock  issuable  upon  exercise of the  Warrants  are
included with the shares of Common Stock currently held by the Reporting Person,
the  percentage  of the entire  class of Common Stock  beneficially  held by the
Reporting Person is 3.70%.

Item 4. Purpose of Transaction

The Reporting  Person disposed of an aggregate of 37,500 Units between March 25,
1999 and April 14, 1999 based on favorable market prices for the Units and other
business opportunities.

While the  Reporting  Person has no present  intention  to  purchase or sell any
additional  shares  of  Common  Stock  or  Units,  it may,  depending  upon  its
evaluation  of the  Issuer's  business and  prospects,  determine to increase or
decrease  or  dispose  of its  position  in  the  Issuer.  In  making  any  such
determination,  the  Reporting  Person will also take into  consideration  other
available business opportunities and general economic conditions.

Item 5. Interest in Securities of the Issuer

See Items 7 through 13 of the Schedule 13D/A cover page.




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.


Date:  April 15, 1999

                                           SIGA PHARMACEUTICALS, INC.

                                           By: /s/ JUDSON A. COOPER
                                              ----------------------------------
                                               Name:  Judson A. Cooper
                                               Title: Chairman of the Board