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Can someone tell me if stomach cancer is hereditary?I'm writing a paper on stomach...

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Can someone tell me if stomach cancer is hereditary?

I'm writing a paper on stomach cancer. I can tell you that my great grandmother and grandmother both died from it, but none of my grandmother's children or their children have it. 

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The main cause of stomach cancer identified by scientists is infection, especially by the Helicobacter pylori while the factors that are known to increase the risk of getting stomach cancer are autoimmune atrophic gastritis and intestinal metaplasia. Diet is not known to play any role in people getting stomach cancer.

Stomach cancer is not a hereditary ailment though some genetic factors have recently been found to play a role, especially in a very small number of patients with diffuse-type gastric cancers. Research has just begun on this and treatments are being looked at to reduce the risk of the cancer where it runs in the family.

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