Specific reduction in relapse and improvement in DFS from donors with Cen-B/B after transplantation for AML but not ALL. Donors were assigned Cen-A/A, Cen-A/B, and Cen-B/B genotypes. Top, the incidence of relapse (A) and probability of DFS (B) for AML patients. Bottom, the incidence of relapse (C) and probability of DFS (D) are shown for ALL patients on the basis of their donor Cen genotype group.