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Angelina jolie, the supreme court and your dna. she revealed she decided to get a double mastectomy after taking a genetic test. it turns out this test is really provided by only one company in the entire united states of america. that monopoly is creating a controversy going all the way to the supreme court. poppy harlow is "outfront" with an investigation. >> reporter: her announcement made headlines around the world. angelina jolie underwent a double mastectomy after a genetic test showed she had a mutated brca 1 gene, giving her an 87% chance of getting breast cancer. her news put this com...

The supreme court. poppy harlow is "outfront" with an investigation. >> reporter: her announcement made headlines around the world. angelina jolie underwent a double mastectomy after a genetic test showed she had a mutated brca 1 gene, giving her an 87% chance of getting breast cancer. her news put this company front and center. it's not a big player in the big picture of big biotech companies. but it has patents on the brca-1 and 2 genes. when mutated, those genes are linked to an increased risk for breast and ovarian cancer. because of the patents, myriad has a monopoly on the test to find t...

But making a sdwigs decision to have your breasts removed is a tough decision. a lot of support for angelina jolie who has invited us into her journey. she called this piece my medical choice and go indepth about her difficult health decision. actress, activist, advocate, mother. angelina jolie is many things and tuesday the actress added proactive survivor to the list. she talked about her decision to undergo a preventative double mastectomy, after testing positive for brca 1, increases a woman's risk for certain types of cancer. she writes, my doctors estimated that i had an 87% chance of br...

Lot longer than if she did not take such drastic measures. what do you think about that? is that accurate? >> yeah, no, i think it is and because it is not only these women sometimes it is a difficult decision to make and you have to decide where you are in your life-style because you really should take out your ovaries too. so obviously you can't have kids. and the tubes attached to the ovaris. so you have to make this decision where you are in your life-style. but it does reduce the risk because you don't have the ovaris. you don't have the breast tissue and it reduces your risk. jenna: just...

Descent. they have two first degree relative, mother or sister or three second degree relatives, mothers aunts that have breast cancer. there are other genes that cause it but the majority of cases are sporadic. so if you don't have a family history of any type of disease, then genetic testing might not help you because you can get a sporadic case of it, a sporadic mutation we don't know about. even though we know about these two genes, and there are a bunch of other genes we're starting to identify associated with breast cancer, ovarian cancer. we don't know them all. jenna: i'm sorry. we're ...