Exhibit 1.27 SUBSCRIPTION AND DEBENTURE PURCHASE AGREEMENT To: ALTAREX CORP. 610 Lincoln Street Waltham, Massachusetts 02451 USA A. SUBSCRIPTION 1. (a) The undersigned United Therapeutics Corporation (the "Purchaser") hereby subscribes for and agrees...Security Agreement • June 6th, 2002 • Altarex Corp • Pharmaceutical preparations • Ontario
RECITALSExclusive License Agreement • June 6th, 2002 • Altarex Corp • Pharmaceutical preparations • Maryland
EXHIBIT 1.28 REGISTRATION RIGHTS AGREEMENT THIS AGREEMENT is made as of April 17, 2002; BETWEEN: ALTAREX CORP., a corporation incorporated under the laws of Alberta (hereinafter referred to as the "Company")Registration Rights Agreement • June 6th, 2002 • Altarex Corp • Pharmaceutical preparations • Ontario
