Cancer is not a single disease but rather more than 100 types of disease. Yet all cancer begins with a genetic mutation within a body cell and advances when the cell's descendants mutate further. The following step through from NOVA Online shows the progression of a malignant tumor, ending with metastasis, the colonization of tumors throughout the body. It focuses on the most common type of cancer, a carcinoma, which can originate in the skin, breast, prostate, and other organs.
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