At 24 months , the sustained remission rate was nonsignificantly higher in group A ( n = 43 ) than group B ( n = 42 ; 64.4 % versus 50.0 % ; hazard ratio , 0.57 ; 95 % confidence interval , 0.29 to 1.11 ; P = 0.09 ) , and the progression-free survival rate was significantly higher ( 88.1 % versus 68.4 % ; hazard ratio , 0.33 ; 95 % confidence interval , 0.12 to 0.94 ; P = 0.03 ) .