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What is stomach cancer?

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Cancer of the stomach, or gastric cancer, is a disease in which stomach cells become malignant (cancerous) and grow out of control, forming a tumor. Almost all stomach cancers (about 95%) start in the glandular tissue that lines the stomach. The tumor may spread along the stomach wall or may grow directly through the wall and shed cells into the bloodstream or lymphatic system. Once beyond the stomach, cancer can spread to other organs.

SOURCES: 

American Academy of Family Physicians: "What Should I Know About Stomach Cancer?"

The Mayo Clinic: “Stomach cancer.” 

The Journal of the American Medical Association, January 14, 2004.

Reviewed by Laura J. Martin on November 29, 2017

SOURCES: 

American Academy of Family Physicians: "What Should I Know About Stomach Cancer?"

The Mayo Clinic: “Stomach cancer.” 

The Journal of the American Medical Association, January 14, 2004.

Reviewed by Laura J. Martin on November 29, 2017

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How are stomach cancers classified?

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