The breasts are the chest wall and developed in women during puberty, when they begin to produce the female hormones (estrogen, progesterone) from the ovaries. In men, the breasts remain swollen and rare atrophic (gynecomastia), so the man must be investigated. The breast consists of 15-20 lobules, which contain many small lovidia, which in turn contain glands that produce milk. The drainage is done by small tubes (resources) that flow into the nipple, located in the center of a dark area of ​​skin called the areola. Among lovidion and resources is fat. The breasts also contain lymph vessels and lymph nodes trap bacteria, cancer cells and other harmful substances blocking the way to reach the circulation. The breasts then, are instruments used to produce milk and are composed of various tissues (glandular tissue, adipose tissue, muscle tissue), which in turn consist of several cells (glandular cells that produce milk, fat cells that support the breast muscle cells that help in the secretion of milk). Breast cancer develops from the glandular cells of resources and lovidion. Rarely, however, developed malignancies and from adipose or muscle tissue, called sarcomas. Each breast enlargement is not necessarily cancer. Benign tumors are usually smooth, do not extend to other organs and their removal involves the non-recurrence. In contrast, breast cancer develops gradually leaches adjacent organs or tissues (skin, muscles, lymph nodes) and later can give metastasis to distant organs (liver, lungs, bones, brain etc.).. We emphasize that breast cancer is not contagious. Source: Demosthenes B. Skarlatos (2008), "Learning for Breast Cancer," Above all ap'A Woman, Guide to Breast Cancer, Panhellenic Association of Women with Breast Cancer "Alma Zois", published by the Dioptra.