Gastrointestinal cancers are the most common type of cancer. The term encompasses malignancies in the organs and structures of the digestive system, including the upper and lower gastrointestinal tracts. Symptoms and treatment options vary widely depending on the exact location of the tumor and the stage of the disease.
Gastrointestinal cancers can occur anywhere along the upper or lower gastrointestinal tract. In the upper tract, tumors most commonly develop in the esophagus, stomach, pancreas, and liver. Colorectal cancer occurs in the lower tract. Some people may also develop malignancies in the anus. Gastrointestinal carcinoid tumors are a rare type that affects the lining of the stomach, the intestines, or the appendix.
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