How is morphology of breast cancer?

➢ The most common location of tumors within the breast is in the upper outer quadrant (50%), followed by the central portion (20%). ➢ About 4% of women with breast cancer have bilateral primary tumors or sequential lesions in the same breast. ➢ Breast cancers are classified morphologically according to whether they have penetrated the basement membrane. ➢ Those that remain within this boundary are termed in situ carcinomas, and those that have spread beyond it are designated invasive carcinomas