Stomach cancer, also called gastric cancer, is a malignant tumor in the lining of the stomach. There has been a significant decrease in the number of people diagnosed with stomach cancer in the past 60 years.
Stomach cancers are classified according to the type of tissue where they originate. The most common type of stomach cancer is adenocarcinoma, which starts in the glandular tissue of the stomach and accounts for 90 to 95 percent of all stomach cancers. Other forms of stomach cancer include lymphomas, which involve the lymphatic system, and sarcomas, which involve the connective tissue (such as muscle, fat, or blood vessels).
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