Cancer »
Defining cancer
Cancer is a term used for diseases in which abnormal cells divide without
control and are able to invade other tissues. Cancer cells can spread to
other parts of the body through the blood and lymph systems.
Cancer is not just one disease but many diseases. There are more than 100
different types of cancer. Most cancers are named for the organ or type of cell
in which they start -- for example, cancer that begins in the colon is called
colon cancer; cancer that begins in basal cells of the skin is called basal cell
carcinoma.
Cancer types can be grouped into broader categories. The main categories of
cancer include:
- Carcinoma - cancer that begins in the skin or in tissues that line or cover
internal organs.
- Sarcoma - cancer that begins in bone, cartilage, fat, muscle,
blood vessels, or other connective or supportive tissue.
- Leukemia - cancer that sta...
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