DNA and Discovery

Shortly after her mother died of ovarian cancer, Jessica Queller had herself tested for the dreaded BRCA gene mutation. She tested positive, which meant she had an 87 percent chance of developing breast cancer, and a nearly 50 percent chance of ovarian cancer. So Queller did the unthinkable: at the age of 34 - unattached and still wanting a family - she had both her breasts removed. In this hour of To the Best of Our Knowledge, the new era of genetic testing.