I have had the test and was found positive. I think it's really important to know since you will need to make sure you are checked every six months.
I have lost 3 of my family members because they didn't know and have one more diagonosed with breast cancer.
I have also agreed to be a in a study. I hope your tests are negative but if they're not you will be one step ahead of cancer by being able to keep a check on it.