1390416 OSr overall survival after recurrence 6 1390414 OSR oxidative stress-related 2 1390419 OS-R oral and maxillofacial surgery-residency 1 1390418 OS-R OS after recurrence 1 1390421 OS-R OS after recurrence or progression 1 1390420 OS-R OS-EP and drug-resistant 1 1390417 OS-R overall survival 1 1390415 OS-R overall survival from the time of rechallenge 1