The probability of cancer being hereditary is not high. This is because cancer is only genetically predisposed and the development of cancer requires a combination of factors. Cancer is a kind of general term for malignant tumor diseases, which generally refers to all malignant tumor diseases. At present, the cause of cancer is not completely clear, but it is certain that the essence of cancer is gene mutation, and this gene mutation is related to congenital heredity, and personal age, environment and other factors also have extremely close contact, the development of the disease is often the result of multi-factors together. On the whole, the probability of cancer heredity is not high, but there is no clear scientific data on how high the probability of cancer heredity is, and we can only say that cancer has the tendency to be hereditary, but it will not be directly hereditary.