I think some chemicals I worked with years earlier may have triggered it. Specifically toulene. Smoking is at the root of many cancers of course including bladder types.

As smoking declines across the general population cancer incidence seems far from retrenching. We may have just introduced too many carcinegenics into our lives.

All the continious outgassing of synthetics around us is substantial and growing in my opinion. Processing of food as well in so many ways that were non existant many years ago has got to be suspect.

Something is going on out there anyways.