brca 1 and brca 2, breast cancer 1 gene and breast cancer 2 gene. how significant is it?ho should get tested for this, and what do you do with that information? >> so the women that should get tested are women who have a history of breast cancer in their family, particularly if their mother had breast cancer at a young age, 20 to 30. they have a father who had breast cancer, prostate cancer, ovarian cancer. when you see the cancer running in the family, you think that there may be one of these mutations of these genes that you are describing. when a woman gets tested, though, we know that if she's positive, they have a mutation, she has about a five time greater chance of being diagnosed with breast cancer over her lifetime. >> so you start to look at these things in aggregate. first of all, there are more women going to be diagnosed with breast cancer who have no family history, right? >> 85% or so. >> so that means you shouldn't take great solace thinking you don't have family history thinking i don't need to get the screening test or be examined. as far as the breast c

brca one and two increase the risk of developing the risk of breast and ovarian cancer as much as 20imes. >> what to do when a woman tests negative for the mutation identified in her family. >> women without the mutation had a higher than average risk for the disease. that research compared women with relative who is had the gene to the general population. stanford university says that's like comparing apples to oranges. anyone with a relative with cancer has a small increased risk for the same disease. they compared the test group to relatives with breast cancer. >> we did not find a greatly elevated risk for breast cancer. i think the negative test can be reassuring to them. >> reporter: they may not have to face the choices made by their mother, sister or grandmother. >> women who test negative for the gene but have family members that are carriers should follow the same mammogram guidelines as the general population. >>> a boy remains hospital sized after spending five nights in the builderness. he was with his father when he got lost. the 8-year-old who is autistic was found fri