The largest study to date on poultry workers found a significantly increased risk of dying
from penile cancer, thought to be due to exposure to oncogenic (cancer - causing) chicken viruses, which raise consumer concerns as well.
Newborn circumcision provides some protection
from penile cancer, which only occurs in the foreskin.
Not exact matches
I have to disagree w / some of the research you refer to (specifically the
penile cancer) because it differs
from what I've found — http://www.bmj.com/cgi/content/full/312/7033/779/c -, but it's possible there are different studies out there showing different results.