I agree with syska @syska that even though genetic testing is expensive, it is helpful for your diagnosis and knowledge to share with relatives. Mine was covered by insurance. Check with your facility about charges and ask your insurance company about coverage.

I have 3 sisters and including myself 3 out 4 have been diagnosed with breast cancer, all caught very early. My sister and me both did genetic testing (10 years apart) and neither showed any genetic cause. Odd, but I think it is probably some genetic trait that has not been found yet. Or may be environmentally. May never know.

Laurie