Stomach cancer, also called gastric cancer, is a cancer that starts in the stomach. To understand stomach cancer, it helps to know about the normal structure and function of the stomach. The most common cause is infection by the bacterium Helicobacter pylori, which accounts for more than 60% of cases. Lymphomas and mesenchymal tumors may also develop within the stomach. Most of the time, stomach cancerdevelops through a number of stages over a number of years.
Diagnosis is usually by biopsy done during endoscopy. The pathologic examination of the resected specimen shows incomplete resection or deep invasion by tumor, the patient would need a formal stomach resection.The number of new cases of stomach cancer was 7.4 per 100,000 men and women per year. The number of deaths was 3.4 per 100,000 men and women per year. These rates are age-adjusted and based on 2008-2012 cases and deaths.It was estimated that 76,829 people living with stomach cancer in the United States.