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Comparison of older related vs younger unrelated donors for old recipients of allogeneic hematopoietic cell transplantation with AML or MDS- a large single center analysis.
Transplantation and cellular therapy. 2024 May 4
For patients undergoing allogeneic hematopoietic cell transplantation (alloHCT), HLA-matched related donors (MRDs) have traditionally been the preferred donor source. However, as the age of recipient increases, their sibling donors are likely aged as well. In this study, we investigated whether younger matched unrelated donors (MUDs) might be a better donor source than similarly aged siblings for patients over the age 60 years with AML or MDS. Four hundred ninety nine patients with AML or MDS age between 60 and 70 years who underwent alloHCT from an older MRD (donor age ≥50 years) or younger MUD (donor age ≤35 years) between 2010 and 2022 were evaluated. Of these, 360 (72%) patients received MUD and 139 (28%) received MRD grafts. The median recipient age was 64 and 66 years in the MRD and MUD groups, respectively. With median follow-up among survivors of 53 months (range 9, 147), 4-year PFS was 40% and 41% in the MRD and MUD groups, respectively (p=0.79). Four-year OS was 50% and 44% in the MRD and MUD group, respectively (p=0.15), with no differences in NRM, relapse, and acute or chronic GVHD. We also assessed effect of donor age in the MUD group between donor ages of 18-24 and 25-35 years; no differences in outcome were seen between the groups. We conclude that outcomes between older MRD and younger MUD for elderly patients with AML or MDS are comparable and there is no donor age effect among younger MUDs and the use of either donor is reasonable.
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