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How do cancerous tumors develop?

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Cells in the body normally divide, or reproduce, only when new cells are needed. Sometimes, cells in a part of the body grow and divide out of control, which creates a mass of tissue called a tumor. If the cells that are growing out of control are more normal cells, the tumor is called benign, or non-cancerous. If, however, the cells that are growing out of control are abnormal, don't function like the body's normal cells, and begin to invade other tissue, the tumor is called malignant, or cancerous.

SOURCE:

American Cancer Society.
News release, FDA.

Reviewed by Laura J. Martin on November 11, 2017

SOURCE:

American Cancer Society.
News release, FDA.

Reviewed by Laura J. Martin on November 11, 2017

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