Breast cancer is a disease in which cells in the breast grow out of control. Breast cancer can begin in different parts of the breast and can spread outside the breast through blood vessels and lymph vessels. When breast cancer spreads to other parts of the body, it is said to have metastasized.
In Malaysia, it is the most common form of cancer affecting women with about one in 19 women in this country. (National Cancer Registry 2007-2011).
Breast cancer happens when the cells in the lobules (milk-producing glands) or the ducts become abnormal and divide overwhelmingly. These abnormal cells begin to attack the surrounding breast tissue and may eventually spread via blood vessels and lymphatic channels to the lymph nodes, lungs, bones, brain and liver.