Breast Cancer

Breast cancer is a kind of cancer that develops from breast cells.
Breast cancer usually starts off in the inner lining of milk ducts or the lobules that supply them with milk.

A malignant tumor can spread to other parts of the body. A breast cancer that started off in the lobules is known as lobular carcinoma, while one that developed from the ducts is called ductal carcinoma.

The vast majority of breast cancer cases occur in females. This article focuses on breast cancer in women. 

Breast cancer is the most common invasive cancer in females worldwide. It accounts for 16% of all female cancers and 22.9% of invasive cancers in women.

18.2% of all cancer deaths worldwide, including both males and females, are from breast cancer.

Breast cancer rates are much higher in developed nations compared to developing ones. There are several reasons for this, with possibly life-expectancy being one of the key factors - breast cancer is more common in elderly women; women in the richest countries live much longer than those in the poorest nations.

The different lifestyles and eating habits of females in rich and poor countries are also contributory factors, experts believe.

1. Chest wall.
2. Pectorals muscles.
3. Lobules (glands that make milk).
4. Nipple surface.
5. Areola.
6. Lactiferous duct tube that carries milk to the nipple.
7. Fatty tissue.
8. Skin.