methotrexate was associated with a significantly lower risk of leukaemia recurrence than were other methods of gvhd prophylaxis ( relative risk 0.2 , p less than 0.0003 , for first-remission transplants ; relative risk 0.3 , p less than 0.0001 , for second remission transplants ) .
C0025677
methotrexate
C0023418
risk