defined:

Diseases in which abnormal cells divide and grow unchecked. Cancer can spread from its original site to other parts of the body and can also be fatal if not treated adequately.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Jeffrey Trent, former chief of the National Human Genome Research Institute's Laboratory of Cancer Genetics, defines cancer.

related
terms:

carcinoma, cell

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