With a median follow-up of @ years ( range : @-@ @ years ) for surviving patients and @ years for all patients ( range : @-@ @ years ) , the @-year estimate of local-regional failure was @ % versus @ % ( P = @ ) , local-regional progression-free survival was @ % versus @ % ( P = @ ) , and overall survival was @ % versus @ % ( P = @ ) for the RT+EPO and RT arms , respectively .