A phase II study of reduced intensity double umbilical cord blood transplantation using fludarabine, melphalan, and low dose total body irradiation

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Abstract

In this multicenter Phase 2 single arm study, we substituted low dose total body irradiation (TBI) for antithymocyte globulin (ATG) in a reduced intensity conditioning regimen with the intent to lower the risk for viral infections after double umbilical cord blood (UCB) transplantation. The conditioning regimen consisted of fludarabine (30 mg/m2/day, Day −7 to −2), melphalan (100 mg/m2/day, Day −1), and TBI (200cGy, Day 0). Graft-versus-host disease prophylaxis was sirolimus and tacrolimus. Thirty-one patients were treated on the protocol. The median time of follow-up for survivors was 24 months (range, 3.3–55.1). Nineteen patients experienced a total of 24 clinically significant viral reactivations or infections, with 1-year cumulative incidence rate of first significant viral event as 64% (95% CI, 43–79%), compared with our historical control of 53%. Within the context of these 24 clinically significant viral reactivations, there were a total of 10 infections with organ involvement. Nonrelapse mortality was 28% (95% CI 13–45%) at 2 years. The 2-year overall and progression-free survivals were 53% (95% CI 33–69%) and 47% (95% CI 28–64%), respectively. In conclusion, the substitution of low dose TBI for ATG did not decrease the incidence of significant viral events after UCB transplantation.

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Funding

Amgen Inc. provided clinical trial funding.

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Correspondence to Corey S. Cutler.

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The authors declare that they have no conflict of interest.

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DeFilipp, Z., Li, S., Avigan, D. et al. A phase II study of reduced intensity double umbilical cord blood transplantation using fludarabine, melphalan, and low dose total body irradiation. Bone Marrow Transplant (2019) doi:10.1038/s41409-019-0715-x

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