Genetic testing may reveal whether the cancer risk in a family is passed through their genes. The lab test itself is quite complex, but only a blood sample is needed. Finding an altered gene indicates an increased risk of getting cancer, but it will not indicate if or when cancer will develop. You may find it harder to cope with your cancer risk when you know your test results Negative test results may provide a false sense of security because you think you have no chance of getting cancer, which is not true. You would still have the same risk as women in the general population.
Genetic testing can affect relationships with family members.
The NCI says it is up to you to decide who in your family might want to know your test results, and whom you might want to tell. It is very important for people to understand and carefully weigh the benefits and risks of genetic testing before these tests are done.