NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,881 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

A drug used to treat advanced breast and endometrial cancer. It is also used to treat anorexia (loss of appetite) and cachexia (weakness and loss of body weight and muscle mass) in patients with AIDS. It is also being studied in the treatment of anorexia and cachexia in patients with cancer or other conditions. Megace blocks the effects of the hormone estrogen in the body, which may help keep some cancer cells from growing. It may also improve appetite. Megace is a type of progestin. Also called megestrol acetate.