Stomach cancer, also called gastric cancer, is a malignant tumor arising from 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. According to the American Cancer Society, the estimated numbers of new cases (people diagnosed with the condition) and deaths from gastric cancer in the United States in 2012 will be:
New cases: 21,320
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% 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).
Stomach cancer may often be cured if it is found and treated at an early stage. Unfortunately, the outlook is poor if the cancer is already at an advanced stage when discovered. In most cases, stomach cancer is found at later stages.