What Is Gastric (Stomach) Cancer?
More than 20,000 cases of gastric cancer (stomach cancer) are diagnosed in the United States each year. Gastric cancer often begins in the mucosa, which is the stomach's inner lining. From there, cancer cells may spread to outer layers of the stomach.
If the cancer cells reach the outer layer of the stomach, they can spread to surrounding organs. This process is known as metastasis. As the cancer spreads, it becomes more difficult to treat.