It is reasonable to blame the immune system for cancer. After all, a “healthy” immune response is supposed to fight everything foreign to the body, including cancer cells. There are many reasons (active and passive) as of why the immune system may fail. Immunotherapy assumes that stimulating the immune system may work (possibly in conjunction with other therapies) to eradicate the cancer cells. Improving the immune system can be done in many different ways, ranging from infusing cytokines that activate immune cells through more modern approaches of engineering immune cells to target and fight specific cancers. In this talk, Levy shows how math may be the key for harnessing the complex dynamics of the immune system to fight cancer.