For the preoperative , postoperative and no RT groups , respectively , the percentage of patients was 12.8 % , 19.3 % and 67.9 % ; the percentage of stage II/III tumours was 57.0 % , 88.7 % and 48.1 % ; and the local recurrence rate was 5.3 % , 10.2 % and 5.5 % ( p = 0.05 ) .