Breast cancer is a disease in which cancer cells grow in the breast tissue.
Cancer occurs when cells in the body (in this case breast cells) divide without control or order. Normally, cells divide in a regulated manner. If cells keep dividing uncontrollably when new cells are not needed, a mass of tissue forms, called a growth or tumor.
The term cancer refers to malignant tumors, which can invade nearby tissue and spread to other parts of the body. A benign tumor does not invade or spread. Although most people think of breast cancer as affecting women, men can develop breast cancer as well, and breast cancer in men can be more aggressive than in women.
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