I just had out patient surgery to remove a cancer tumor from my bladder. All's well, just a check up every three months. There are 1000 different reasons that the tumor might have formed. I'm 58 years old, worked with PCB,s, smoked, and ate burned hot dogs. I also didn't wear a mask when I worked with glass cloth and epoxy. I have become epoxy sensitive, my tounge swells up if I don't shower right after use. Anyway....who knows why, just glad to be able to paddle this summer. I now wear a good respirator.