EXHIBIT 4.3 FIRST AMENDMENT TO RIGHTS AGREEMENT FIRST AMENDMENT, dated as of February 26, 2004 (this "Amendment"), to the Rights Agreement, dated effective as of April 10, 2001 (the "Rights Agreement"), between ILEX Oncology, Inc., a Delaware...Rights Agreement • March 12th, 2004 • Ilex Oncology Inc • Biological products, (no disgnostic substances) • Delaware
EXHIBIT 10.18 CONSULTING AGREEMENT THIS AGREEMENT is made and entered into as of this 1st day of January, 2003, ("Effective Date") by and between ILEX(TM) Products, Inc. with place of business at 4545 Horizon Hill Blvd., San Antonio, Texas 78229 (ILEX...Consulting Agreement • March 12th, 2004 • Ilex Oncology Inc • Biological products, (no disgnostic substances) • Texas
