PBSCs from unrelated donors associated with higher rates of chronic GVHD HemOncToday While PBSCs from related donors have been shown to have clinical benefit, Anasetti told HemOnc Today that these results show that PSBCs from unrelated donors put patients at greater risk for chronic GVHD without conferring similar benefits. ... PBSC Transplants from Unrelated Donors Show No Survival Advantage ASH: Bone Marrow Best for Unrelated Donor SCT |