[Bainbridge]

http://www.cancer.org/docroot/CRI/content/CRI_2_4_2X_Do_we_know_what_causes_Anal_Cancer_47.asp

[jla]

Yes, I read that when I did a Google search.
"Although the exact cause of anal cancer is not known, most anal cancers seem to be linked to infection with the human papilloma virus (HPV)."

I still don't get what point you wish to make.