Immunotherapy is a type of treatment that encourages the work of the immune system or the immune system to be more effective in fighting diseases, including cancer. This treatment can be given by infusion, oral medication, topical cream, or injected directly into the bladder of cancer sufferers. Immunotherapy is said to slow down, stop the development of cancer cells, and prevent it from spreading to other organs. A number of types of cancer, such as skin, lung, kidney, bladder and lymphoma, have been proven to be treated with immunotherapy. Some types of advanced cancer, such as cervical cancer stage 4, can also sometimes be treated with immunotherapy. Reasons for Using Immunotherapy to Manage Cancer One reason that makes cancer cells difficult to handle is because the immune system sometimes cannot recognize it as a foreign object. Some cancer cells are very similar to normal cells, so the immune system does not attack it. Although the immune system can recognize cancer cells,