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What is cancer?

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Throughout our lives, healthy cells in our bodies divide and replace themselves in a controlled fashion. Cancer starts when a cell is somehow altered so that it multiplies out of control. A tumor is a mass composed of a cluster of such abnormal cells.

From: Understanding Cancer -- the Basics WebMD Medical Reference

SOURCES: 

National Cancer Institute. 

WebMD Medical Reference from the American College of Physicians: "Oncology I Cancer Epidemiology and Prevention."

Reviewed by Louise Chang on January 27, 2018

SOURCES: 

National Cancer Institute. 

WebMD Medical Reference from the American College of Physicians: "Oncology I Cancer Epidemiology and Prevention."

Reviewed by Louise Chang on January 27, 2018

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