Abstract
To define the tolerability and outcome of allogeneic hematopoietic stem cell transplant (allo-HSCT) following CAR T-cell therapy, we retrospectively reviewed pediatric/young adult patients with relapsed/refractory B-ALL who underwent this treatment. Fifteen patients (median age 13 years; range 1–20 years) with a median potential follow-up of 39 months demonstrated 24-month cumulative incidence of relapse, cumulative incidence of TRM, and OS of 16% (95% CI: 0–37%), 20% (95% CI: 0–40%), and 80% (95% CI: 60–100%), respectively. Severe toxicity following CAR T cells did not impact OS (p = 0.27), while greater time from CAR T cells to allo-HSCT (>80 days) was associated with a decrease in OS. In comparing CD34-selected T-cell depleted (TCD; n = 9) vs unmodified (n = 6) allo-HSCT, the cumulative incidence of relapse, TRM, and OS at 24 months was 22% (95% CI: 0–49%) vs 0% (p = 0.14), 0% vs 50% [95% CI: 10–90%] (p = 0.02) and 100% vs 50% [95% CI: 10–90%] (p = 0.02). In this small cohort of patients, CAR T cells followed by a CD34-selected TCD allo-HSCT appears to result in less TRM and favorable OS when compared with unmodified allo-HSCT. There was no evidence that disease control was impacted by the type of consolidative allo-HSCT, which demonstrates the feasibility of this approach.
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Acknowledgements
The authors thank the patients and families who participated in this trial; Georgia Flynn, and the Cellular Therapeutic Center at MSKCC for help with this study; Joseph Olechnowicz (Editor, Department of Pediatrics, Memorial Sloan-Kettering Cancer Center) for editorial assistance; and Audrey Mauguen (PhD) for biostatistical support.
Funding
This work was supported by the William Lawrence and Blanche Hughes Foundation (KJC), St. Baldrick’s Foundation provided an A.V.M. Traders Scholar Award (KJC), and National Institutes of Health (NIH), National Cancer Institute (NCI) Cancer Center Support Grant (P30CA008748).
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VAF, FB, MC, JA, MH, SPM, AM, SP, AS, NS, BS, ES, NY, NAK, RJO'R, RJB, JJB, and KJC designed the research and performed research (treated patients/collected data); VAF, AM, and KJC analyzed the data and made the figures; VAF and KJC wrote the manuscript; and all authors critically reviewed the manuscript and approved the content.
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KJC has received research support from Juno Therapeutics and Novartis and has consulted, participated in advisory boards, or participated in educational seminars for Juno Therapeutics, Novartis, and Mesoblast; SPM has participated in advisory boards for Novartis; RJB is a co-founder and received royalties for Juno Therapeutics. The remaining authors declare no competing financial interests.
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Fabrizio, V.A., Kernan, N.A., Boulad, F. et al. Low toxicity and favorable overall survival in relapsed/refractory B-ALL following CAR T cells and CD34-selected T-cell depleted allogeneic hematopoietic cell transplant. Bone Marrow Transplant 55, 2160–2169 (2020). https://doi.org/10.1038/s41409-020-0926-1
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DOI: https://doi.org/10.1038/s41409-020-0926-1
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