I'd like to know how my 20 year old otherwise healthy son, who never smoked or chewed and almost never drank, got cancer. His HPV tests came back negative. The genetic information we provided was not suspicious either.

His doctors have said that because he developed this disease at such a young age, with no known risk factors, it is more likely that he will have a recurrence of SCC - or develop some other kind of cancer in his lifetime. That's scary. If I knew what caused the cancer, at least we could be on the lookout for certain strains of it.

Beyond that, I have a daughter too. If my son's cancer was caused by something in his environment -- then it's been in her environment as well. A month ago she had her first ever visit to a gynecologist along with her first ever PAP smear. It came back slightly abnormal. The doctor (at a clinic where she attends college) said it was nothing to worry about. They won't do anything but take another PAP a few months down the road.

That scares me too.

What if my son's cancer was caused by something that my daughter experienced too? Would the doctor's recommendation still be the same?

Not knowing is like waiting for the other shoe to drop - except that some days it feels like there are 10,000 shoes all hovering over my kids' heads.

Cancer sucks.