» Articles » PMID: 34700343

Primary Graft Failure, but Not Relapse, May Be Identified by Early Chimerism Following Double Cord Blood Unit Transplantation

Abstract

Umbilical cord blood transplantation (UCBT) has increased access to potentially curative therapy for patients with life-threatening disorders of the bone marrow and immune system. The introduction of reduced intensity conditioning (RIC) regimens and double umbilical cord unit infusions (DUCBT) has broadened the applicability of UCBT to more frail or larger recipients. The kinetics of chimerism after RIC DUCBT and their clinical utility are poorly understood. The RIC CBT trial reported here sought to prospectively evaluate the role of lineage-specific chimerism after DUCBT in adult patients with hematologic malignancies in the United Kingdom. Fifty-eight patients with a median age of 52 years were recruited, with overall and progression-free survivals of 59% (95% confidence interval [CI], 45%-71%) and 52% (95% CI, 39%-64%), respectively, at 2 years. Nonrelapse mortality was 4% (95% CI, 1%-13%) at day 100, and the relapse rate was 31% (95% CI, 21%-45%) at 1 year. Peripheral blood lineage-specific chimerism was feasible from day 7 after transplant onward. Five patterns of chimerism were observed including (1) complete single unit dominance (39 patients), (2) sustained donor-donor mixed chimerism (3 patients), (3) sustained donor-recipient mixed chimerism (5 patients), (4) dominance reversion (1 patient), and (5) primary graft failure (4 patients). The RIC CBT trial enabled adult patients with high-risk hematologic malignancies to safely access UCBT in the United Kingdom and provided novel insights into the kinetics of donor and recipient chimerism after RIC DUCBT that are clinically relevant. This trial was registered at https://www.clinicaltrialsregister.eu/ctr-search/trial/2004-003845-41/GB as #NCT00959231 and EudraCT 2004-003845-41.

References
1.
Ballen K, Spitzer T, Yeap B, McAfee S, Dey B, Attar E . Double unrelated reduced-intensity umbilical cord blood transplantation in adults. Biol Blood Marrow Transplant. 2007; 13(1):82-9. PMC: 2947324. DOI: 10.1016/j.bbmt.2006.08.041. View

2.
Dubovsky J, Daxberger H, Fritsch G, Printz D, Peters C, Matthes S . Kinetics of chimerism during the early post-transplant period in pediatric patients with malignant and non-malignant hematologic disorders: implications for timely detection of engraftment, graft failure and rejection. Leukemia. 1999; 13(12):2059, 2060-9. View

3.
Moscardo F, Sanz J, Senent L, Cantero S, Rubia J, Montesinos P . Impact of hematopoietic chimerism at day +14 on engraftment after unrelated donor umbilical cord blood transplantation for hematologic malignancies. Haematologica. 2009; 94(6):827-32. PMC: 2688574. DOI: 10.3324/haematol.2008.000935. View

4.
Elkaim E, Picard C, Galambrun C, Barlogis V, Loundou A, Curtillet C . Peripheral blood cells chimerism after unrelated cord blood transplantation in children: kinetics, predictive factors and impact on post-transplant outcome. Br J Haematol. 2014; 166(4):557-65. DOI: 10.1111/bjh.12918. View

5.
Laughlin M, Eapen M, Rubinstein P, Wagner J, Zhang M, Champlin R . Outcomes after transplantation of cord blood or bone marrow from unrelated donors in adults with leukemia. N Engl J Med. 2004; 351(22):2265-75. DOI: 10.1056/NEJMoa041276. View