Risk factors for relapse and second cancers after hematopoietic-cell transplantation.

Abbreviations: HCT, hematopoietic-cell transplantation; PTLD, post-transplant lymphoproliferative disorder; TBI, total body irradiation; ATG, anti-thymocyte globulin, GVHD, graft-versus-host disease; EBV, Epstein Barr virus; HPV, human papilloma virus.