Rebus Holdings, Inc. is a pharmaceutical company engaged in the research and development of novel therapeutics for the treatment of cancer. Its product pipeline includes Mipsagargin, a dual A2A/A2B antagonist, an A2A antagonist, an A2B antagonist, and an A2A agonist. The company was founded by Craig A. Dionne, John T. Issacs, and Samuel R. Denmeade on November 21, 2003 and is headquartered in Westlake Village, CA.