Because your grandma had breast cancer before 50 so you assume she might have BRCA 1 or 2 mutations and you dad may inherit that gene. Assume that your grandma had these mutations and your dad inherits this mutated genes, so he is at risk for high-grade prostate cancer. Biopsy is negative so BRCA (+) or (-) doesn't mean anything. Just follow PSA level and if there is a sudden spike, biopsy again.
Answered 6/17/2021
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BR CA gene mutation can be transmitted to both male and the female offspring of a BRCA carrier. However the frequency/prevalence of this gene in the general population is not more than 5%. Moreover only 50% of the careers transmit the gene to their children. I hope this information will allow you to understand what you wanted to know.
Answered 6/19/2021
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