EXHIBIT 99.1

                CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

                             AS ADOPTED PURSUANT TO

                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

         In connection with the annual report on Form 20-F of AltaRex Corp. (the
"Company") for the period ended December 31, 2002 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), the undersigned,
Antoine A. Noujaim, Chief Executive Officer of the Company, hereby certifies,
pursuant to 18 U.S.C. Section 1350, that:

         (1) the Report fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

         (2) the information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.

Dated: June 30, 2003                         /s/ Dr. Antoine A. Noujaim
                                             ---------------------------------
                                             Dr. Antoine A. Noujaim
                                             Chief Executive Officer

A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the electronic version of this written statement
required by Section 906, has been provided to AltaRex Corp. and will be retained
by AltaRex Corp. and furnished to the Securities and Exchange Commission or its
staff upon request.