The treatment of disease by the use of chemical substances, especially the treatment of cancer by cytotoxic and other drugs.

Hormone Therapy for Prostate Cancer. Hormone therapy is also called androgen deprivation therapy (ADT) or androgen suppression therapy. The goal is to reduce levels of male hormones, called androgens, in the body, or to stop them from affecting prostate cancer cells. Androgens stimulate prostate cancer cells to grow.

Hormone therapy for breast cancer is a treatment for breast cancers that are sensitive to hormones. The most common forms of hormone therapy for breast cancer work by blocking hormones from attaching to receptors on cancer cells or by decreasing the body's production of hormones