Bisphosphines related to bis (dipheny1phosphino) ethane (dppe) and their gold complexes are described that are active in a spectrum of tiansplantable tumor models. When administered ip on days 1-5 at its maximally tolerated dose (MTD) of 40 pmol/kg, dppe reproducibly gives 100% increase in life span (ILS) in mice bearing ip P388 leukemia. Coordination of chlorogold (1) to each phosphine in dppe gave a complex that had similar ...