29yo. pat grndmthr diagnosis breast cancer@24yo. ovarian cx@age 34& took her@68yo.inherent odds? +ive virtually zero chest, size <34a-change my odds?

Hereditary CA: With grandma having both cancers at a young age, and both ca being the ones linked to a gene you should talk to your doctor about testing and what you would do differently if positive. Also see if you can get more family history data. That would help a lot. Size of your breasts won't really matter. Gather info, calculate risks, and stay on top of screening.