Nearly 1 in 2 Canadians will develop cancer and 1 in 8 Canadian women will develop breast cancer in their lifetime. The treatments recommended by mainstream medical doctors consist of some combination of chemotherapy, radiation, and surgery, all of which have side-effects. What few doctors and patients realize is that evidence–based complementary therapies are available that create an internal environment unfavourable for cancer growth, that boost the immune system and minimize side-effects of conventional treatments. These complementary modalities include, but are not limited to, (1) a ketogenic diet; (2) selected botanicals and nutritional supplements; (3) detoxification via saunas, colonics, and dental work; (4) hyperthermia with Rife frequencies; (5) low level light/laser therapy (LLLT); (6) UV light therapy; (7) high dose vitamin C; (8) ozone therapy; (9) pulsed electromagnetic field (PEMF) therapy; and (10) bioresonance therapy. The evidence–based research for these treatments will be presented. These complementary therapies can play an important role in preventative health care for chronic illness and, ideally, should be part of an integrative system of health care for the treatment of cancer.