In a breakthrough that opens the way to improving immunotherapies against cancer, researchers at the University of California at Los Angeles (UCLA) led by Antoni Ribas have discovered why some tumors become resistant to treatment. According to the results presented online in the journal The New England Journal of Medicine, immunotherapy drugs push some cancers to evolve to escape the attack of the immune system. Thus, an arms race between cancer cells and immune cells is triggered so that they prime them. More information.