What Is Cancer?
- Cancer begins in cells, the building blocks that make up all tissues and organs of the body, including the breast.
- Normal cells in the breast and other part of the body grown and divide to form new cells as they are needed.
- When normal cells grow old or get damaged, they die, and new cells take their place.
- Sometimes, this process goes wrong. New cells form when the body doesn't need them, and old or damaged cells don't die as they should.
- The genetic material (DNA) of a cell can become damaged or changed, producing mutations that affect normal cell growth and division.
- The buildup of extra cells often forms a mass of tissue called a lump, growth, or tumor.