There are three levels of genetics. One, as Dr. Simard pointed out, is polygenic risk scores, which give you a risk based on 313 variants. That is his study. There are also major genes BRAC1, BRAC2 and PALB2. Jacques and I were actually working on that together back in the 1980s. Finally, there's family history.
On December 6th, 2023. See this statement in context.