Do you know are colon cancer, breast cancer, and stomach cancer genetically related?

Depends on what you: It is hard to know what you mean. If you mean hereditary, they typically are not except about 5 to 10% of the time there is cancer of the same type in one of the first degree relatives. But cancer is a common disease which will likely affect one in 3 people during a life time.

They can be: Depends on the family history, the age of the patient, where the cancer is located, specifically colon cancer. Right sided colon cancers are more likely genetically related than left sided ones. Hope this helps.