Fig. 1.
Cumulative incidence of grades III-IV acute GVHD after unrelated donor transplant. (A) 0 to 5 months of IFN-α pretransplant (cumulative incidence, 0.34; n = 128), (B) ≥6 months of IFN-α pretransplant (cumulative incidence, 0.55; n = 47) (P = .01, by the χ2 test).