The battle against cancer includes familiar tools such as surgery, radiation and chemotherapy. But for some, a new treatment may be worth considering: Immunotherapy. It’s a strategy that involves activating a patient’s own immune system to beat back and even eliminate the cancer. Recent research demonstrates positive results with several kinds of cancers such as brain, bladder and skin. The treatment has proven effective in some cases when no other therapy has worked, but much more research is needed to determine in advance which patients are most likely to see results. A look at new research on using our own immune systems to treat cancer.