How does immunotherapy work? Immunotherapy is a form of treatment that will use the body’s immune system to help fight cancer. One of the most exciting features of immunotherapy is that, because it works in conjunction with the body’s natural immune system, it has the potential to treat many types of cancer, and hopefully, as new drugs are developed, maybe all cancers. Different cancers may have their specific immune weaknesses, and those are being rapidly sorted out with current immunotherapy r