it is nearly impossible for img's to match,r eally b/c there are more than qualified US graduates. yes, steph was an img who matched...but that was in an era when the field was wide open (no offense, steph). other DO's or IMG's have matched the past few years, but i am not privy to their situation (if they did aways, scores, research, etc).
if you are an img who is interested in radiation oncology, apply far and wide and good luck!