In 2003 at age 62 I had an early oral cancer found and removed (not HPV related). The docs at a leading CCC gave me the advice regarding alcohol. "Don't even drink the tiny glass of champagne at your daughter's wedding".
Being half-Irish and a bit of a rebel, I followed my own road,sometimes abstaining, etc. After ten years without recurrence I thought I could tolerate two glasses of wine a day, and when I told that to my doc, my future was foretold. "This will activate cancer in the jaw which will go to the roots of teeth and require extraction", that was Sept. 2014. Wow, that got my attention so I shifted to two glasses a week but in January 2015 active cancer was found, the prediction came true and the cancer was surgically removed.
Why am I sharing this information? At the time I was trying to figure out how to deal with alcohol in my life I searched a lot and found little that applied to those of us with OC. I knew my doctor's position and at that time I was not ready to abstain, (guess what-I now have). So, if you are searching for information my best guess is that the safest thing to do is to abstain, but if you don't, going days or weeks between drinks seems to be more important (I doubt anybody has really studied this) than the number of drinks when you do drink.
This only my opinion-I'm not a professional in this area so just remember- "Free advice is worth what you pay for it". Good luck.