At a median follow-up of 6.5 years , the study excluded a difference of more than 21 % in 5-year FFS and more than 16 % in 5-year OS between ABVD and Stanford V ( 5-year FFS : 85 % v 79 % ; HR , 0.68 ; 95 % CI , 0.37 to 1.25 ; P = .22 ; 5-year OS : 96 % v 92 % ; HR , 0.49 ; 95 % CI , 0.16 to 1.47 ; P = .19 ) .