These are my thoughts:

Those of us that can't find a cause for our cancer have a choice of driving ourselves crazy trying to figure it out or try to find a way to put it to rest.

I was 59 when I was diagnosed almost 3.5 years ago. I haven't smoked since I was 18 and I was less than a social drinker. My scc was on the lateral border of the tongue and there has never been a documented case of HPV induced scc in this location. I was not tested for HPV, but I can say that it is highly unlikely that it was the cause.

As time goes on, I am less and less concerned about what caused it and have put my efforts into educating my colleagues so that they can perform a comprehensive oral cancer screening for their patients.

I hope that you can find a way to let it go because it's unlikely that you will find the cause.

Jerry