Our understanding of the relationship between cancer and
genetics has grown rapidly. Research is answering many questions
about why some families have more cancer than others. We know
that certain cancers — including breast, colon, uterine,
ovarian, melanoma and pancreatic cancer — are more likely to run
in some families. However, a family history of cancer does not
always mean that you will develop cancer. By understanding your
risk for cancer, you can take steps to improve your health and
reduce your risk. Knowledge of an increased risk for cancer can
also help increase your chances for early detection and
successful treatment. Understanding Your Risk Some people have a
greater chance than others of developing cancer. This may be due
to gene changes that can be passed on through the family. Most
cases of cancer are not inherited, they occur without a family
history of cancer. In fact, nearly 90 percent of cancer is due
to environmental, lifestyle and other factors, not genetics.
However, genetic testing can