Paul,
Related to point 4 below, I've been trying to find information about spread of HPV+ cancer. I had the entire moderately dysplastic papilloma removed from my uvula. Regarding spread, ok this lesion is gone now. But say three months down the road, another papilloma could pop up on my tongue or tonsil and I could see it within the week it appears (right now I'm checking my mouth weekly), that new growth could now be SCC. This is my example for what I thought you may be saying in point 4 below.
Thanks!
Svet
coughed up benign papilloma Feb 2013
Moderate dysplasia growth removed from uvula 6/10/13