About Gastric (Stomach) Cancer: Get the Facts
About the Stomach
The stomach is the organ that holds food and secretes gastric juice to begin the digestive process. People often refer to the area between the chest and pelvis as the stomach. In medical terms, this area actually is the abdomen, and the stomach is just one part of the abdomen.
What Is Gastric Cancer?
As you may have learned from the About Cancer page, cancer occurs when abnormal cells divide uncontrollably. When this process happens in the stomach, gastric cancer develops.
The stomach is divided into several sections and layers. Most gastric cancers occur in the deepest layer called the mucosa
. When gastric cancer occurs in the mucosa, it is called adenocarcinoma
. When gastric cancer has progressed (for instance, grown beyond the area where it started or spread to other organs), it is called advanced gastric adenocarcinoma.
Other types of gastric cancer are very rare. So, if you have gastric cancer, more than likely it is adenocarcinoma. If you do have one of the less common gastric cancers, it may be called lymphoma
, a gastrointestinal stromal tumor
, or a carcinoid tumor
.
Gastric cancers usually grow slowly over time. Typically
precancerous changes happen in the stomach before cancer develops. However, you may not know you have these precancerous changes because they usually do not produce symptoms.
Sometimes gastric cancer can spread, or metastasize
, outside of the stomach and into other body parts. If gastric cancer spreads, it may spread to the lymph nodes
, liver, lungs or bones.
Gastric cancer should not be confused with cancers in other areas of the abdomen, such as the colon, liver, small intestine or pancreas. These cancers may produce different symptoms and require different treatments.
Gastric Cancer Statistics
According to the American Cancer Society:
- Gastric cancer is not a common type of cancer in the United States; it is much more common in other parts of the world, particularly Japan.
- It is estimated that in 2006, approximately 22,000 Americans will be diagnosed with gastric cancer.
- Most people who have gastric cancer are older than age 65.
- It is estimated that in 2006, approximately 11,000 people will die from gastric cancer.
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