Cancer is a term used for diseases in which abnormal cells divide without control and are able to attack other networks. 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 organs or cell types 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.
Types of cancer 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 starts in blood-forming tissue such as bone marrow and causes large numbers of abnormal blood cells are produced and enter the blood.
* Lymphoma and myeloma - cancers that begin in cells of the immune system.
* Central nervous system cancers - cancers that begin in brain tissue and spinal cord.
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