While radiation can cause cancer itself, since the advent of IMRT the risk of that is significantly reduced. Those that do develop an osteosarcoma in the mandible (the most common oral cancer irradiation induced kind) are only about 2-3% of the surviving treated population, and they usually occur around year 10 of survival.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.