Influence of heredity on incidence of cancer

Even if there are no types of cancer that are genetically transmitted, related predispositions have been seen for some types of tumors.

Thus, family members who have a relative with ovarian, breast, or colon cancer are 2 to 4 times more likely to develop the same type of cancer than other people.

Some genetic diseases are associated with an increased risk of cancer, which mainly affects certain organs (for example, retinoblastoma in trisomy 21 or mongolism).

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