Two new studies show that immunotherapy which marshals the body’s own immune defenses is now proving effective against difficult-to-treat head and neck cancer and an extremely lethal skin cancer called Merkel cell carcinoma. The new studies appear to be the first to find that immunotherapy can even treat virus-driven cancers, adding to a list of more than two dozen kinds of cancer that immunotherapy can help quell. Researchers say the results of these studies are a major success and will help to bring in the necessary funds to radically accelerate progress against cancer.