Hi Jim, OCF is like a family and we are all there to help you. The RO has just given her opinion (medical term: prognosis) in view of available statistics and with cancer each individual is different. Like Brian said, BOT cancers are usually HPV16 positive and they respond well to the treatment.
All the best to you and your cousin. He can fight this battle and win if he has the will that cannot be shaken by someone's opinion.