It would not be an overstatement to say past decade has been the grand opening of immunotherapy. Ever since it arrived, this novel treatment method ushered in a huge mortality rate decline for many cancers. Aside from the effectiveness in its core feature--killing cancer--its steady rise in popularity can also be attributed to low side effects. Instead of using the blunt-foreign-object approach to deal with cancer, immunotherapy stimulates the immune system into ridding the body of cancer by itself. The therapy is available for breast cancer, liver cancer, lung cancer, gastrointestinal cancer, and more.