There are two basic approaches to immunotherapy for cancer. One is the isolation of some proteins of the patient’s cancer, which are then used to stimulate the immune system and attack it. These forms of immunotherapy are highly effective on cancers such as prostate, colon, kidney, breast, skin, and others. A second approach is to build a viral “smart bomb,” by engineering certain viruses to selectively invade and kill cancerous cells. When lysis (or cell breakdown) occurs, antigens then release express GM-CST, which further improves the immune response against that cancer.