A drug used to treat breast cancer, and to prevent it in women who are at a high risk of developing breast cancer. Tamoxifen blocks the effects of the hormone estrogen in the breast. It belongs to the family of drugs called antiestrogens.

Endometrial cancer is a disease in which malignant (cancer) cells form in the tissues of the endometrium. The endometrium is the lining of the uterus. The uterus is a hollow, muscular organ in a woman's pelvis. The uterus is where a fetus grows. In most nonpregnant women, the uterus is about 3 inches long. Cancer of the endometrium is different from cancer of the muscle of the uterus, which is called sarcoma of the uterus. Refer to the PDQ summary on Uterine Sarcoma Treatment for more inform...

Tamoxifen as related to Endometrial Cancer