ual cell activity and often will show up on a mammogram. Although they may not yet be cancerous, premalignant cells are treated with the same care and precaution as true breast cancers. Then the cells become malignant but are still within the duct, the cancer is considered"in situ" meaning that the cancer is in place and has not broken through to surrounding tissue. However, if the cells break through the duct lining into surrounding tissue the cancer then becomes invasive. Breast cancer grows over long periods. If these conditions are premalignant, they remain contained within one are or until they develop into noninvasive cancer or invasive cancer.
             Over 80 percent of all breast cancers arise from ductual carcinomas. Carcinoma of the breast is the mo
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