Just because the father is a cancer patient, it does not necessarily mean that the son will get cancer. Cancer is hereditary, so if the father has a malignant tumor, the son has a higher chance of having a malignant tumor than other normal people, but it does not mean that the son will get cancer 100% of the time. There are many other factors related to cancer besides heredity, and heredity only accounts for a small part of cancer occurrence. For example, smoking, alcoholism, frequent consumption of pickles and barbecue, less fresh vegetables and fruits, more high-calorie and high-fat food can increase the chance of cancer, lack of physical exercise and obesity can also increase the chance of cancer, and environmental pollution and ionizing radiation can also increase the risk of cancer.