The Institute of Cancer Research (ICR) in London is shifting the focus of drug discovery from molecular targets in cancer cells to take in the whole ecosystem supporting tumor growth, evolution and the development of resistance. The aim is to exploit new understanding of the way cancers evolve within the ecosystem of the body, the interaction between cancer cells and the immune system, and the reliance of a tumor on the tissue and growth signals that surround it. Manipulating this environment could make cancer cells become “extinct,” ICR researchers say.