What is the most common type of stomach cancer?

Adenocarcinoma is the most prevalent type of stomach cancer, accounting for a significant majority of cases. This type of cancer arises from the glandular cells of the stomach lining, which are responsible for producing mucus and digestive enzymes. Factors contributing to the increased risk of adenocarcinoma include chronic gastritis, infection with Helicobacter pylori, dietary influences, and genetic predispositions.

In comparison, gastric lymphoma, carcinoid tumors, and gastrointestinal stromal tumors make up a smaller proportion of stomach cancer cases. Gastric lymphoma generally originates from lymphatic tissue in the stomach, while carcinoid tumors arise from neuroendocrine cells, and gastrointestinal stromal tumors develop from interstitial cells of Cajal or precursor cells. These types are less common than adenocarcinoma, which is why adenocarcinoma is recognized as the most common form of stomach cancer.