http://www.medicalnewstoday.com/releases/234509.php

Alcohol is known to be carcinogenic to humans in the upper aerodigestive tract, liver, colorectum, and the female breast.

This study showed that there are links between when the “ethanol” in alcohol & our body metabolizes the alcohol, DNA damage occurs to these body parts. We BRCA positive people don't have the correct DNA to fix this damage so the bad cell replication can continue into cancer.