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The primary cancer therapies include surgery, radiotherapy, chemotherapy, immunotherapy, and hormone therapy. Surgery removes solid tumors from localized areas. Radiotherapy uses high-dose radiation to damage tumor cell DNA. Chemotherapy targets fast-growing cells with anti-cancer drugs. Immunotherapy uses vaccines and antibodies to help the immune system recognize cancer cells. Hormone therapy blocks hormone production in hormone-dependent cancers like prostate cancer.

Radiation therapy damages DNA in tumor cells at doses that cancer cells cannot tolerate. While tumor cells have impaired cell cycle checkpoint responses and continue dividing briefly after irradiation, accumulated DNA damage eventually causes their death. Normal surrounding cells survive because they possess efficient DNA repair mechanisms that allow them to recover from radiation exposure.

Chemotherapy drugs target fast-growing cells, which includes both cancer cells and healthy rapidly dividing cells like hair follicles and blood cells. This non-selective targeting causes short or long-term side effects in patients. Unlike targeted approaches, chemotherapy cannot distinguish between malignant and normal fast-growing tissues, affecting multiple cell types throughout the body.

Combination therapies offer multiple benefits: different treatments are more effective at different cancer stages, increasing overall cure likelihood. Using multiple therapies simultaneously creates synergistic effects that boost effectiveness. Lower doses of each therapy reduce damage to healthy tissues and vital organs. For example, radiation and chemotherapy together treat osteosarcoma without requiring limb amputation, demonstrating how combination therapies and personalized medicine improve patient outcomes.

Immunotherapy uses cancer vaccines, immunomodulators, and monoclonal antibodies to enhance the immune system's ability to recognize and attack cancer cells. Unlike chemotherapy, which directly kills fast-growing cells indiscriminately, immunotherapy works by boosting the body's natural defenses. This targeted approach reduces damage to healthy tissues while enabling the immune system to specifically identify and eliminate cancer cells.

Different cancer cells contain different mutations and respond variably to therapies. Some cancers respond to one treatment while others respond to different approaches. Treatment selection depends on cancer type and stage of advancement. Recent advances enable personalized medicine where therapy is tailored to the specific genetic changes in each patient's cancer, improving treatment effectiveness and reducing unnecessary side effects from ineffective therapies.

Cancer cells mutate rapidly and develop resistance to chemical agents and radiation therapy. Additionally, therapies toxic to cancer cells are generally also toxic to normal cells, limiting treatment intensity. Not all cancer types respond to the same therapy, requiring individualized approaches. These challenges explain why most patients require combination treatments rather than single therapies to overcome resistance and maximize treatment success.