View your list of saved words. (You can log in using Facebook.)
Malignant tumour in a breast, usually in women after menopause. Risk factors include family history of breast cancer, prolonged menstruation, late first pregnancy (after age 30), obesity, alcohol use, and some benign tumours. Most breast cancers are adenocarcinomas. Any lump in the breast needs investigation because it may be cancer. Treatment may begin with radical or modified mastectomy or lumpectomy (in which only the tumour is removed), followed by radiation therapy, chemotherapy, or removal of the ovaries or adrenal glands.
This entry comes from Encyclopædia Britannica Concise. For the full entry on breast cancer, visit Britannica.com.
Seen & Heard
What made you look up breast cancer? Please tell us what you were reading, watching or discussing that led you here.