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2024-08-28T11:41:04.000Z

Impact of the type of TKI prior to allo-HSCT on outcomes in patients with Ph+ ALL

Aug 28, 2024
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Learning objective: After reading this article, learners will be able to cite a new clinical development in acute lymphoblastic leukemia.

A retrospective, registry-based analysis assessed the impact of the type of tyrosine kinase inhibitor (TKI) used prior to allogeneic hematopoietic stem cell transplantation (allo-HSCT) on post-transplant outcomes in adult patients with Philadelphia positive (Ph+) acute lymphoblastic leukemia (ALL).1 This analysis included 863 patients with Ph+ ALL who were treated with imatinib (n = 606), dasatinib (n = 163), or both (n = 94).1 Results were published in Transplantation and Cellular Therapy by Giebel et al.1

Key learnings

At 2 years, no significant difference was observed in the pre-allo-HSCT imatinib, dasatinib, and imatinib + dasatinib treatment groups for:

  • Incidence of relapse (26% vs 21% vs 19%; p = 0.06) 
  • Non-relapse mortality (19% vs 15% vs 23%; p = 0.37)
  • Leukemia-free survival (55% vs 63% vs 58%; p = 0.11)
  • Overall survival (72% vs 76% vs 65%; p = 0.32)

While the cumulative incidences of Grade 2–4 graft-versus-host disease (GvHD) and chronic GvHD were similar between treatment groups, dasatinib was associated with a significantly higher risk of Grade 3–4 acute GvHD (20%) compared with imatinib or imatinib + dasatinib (10% vs 13%, respectively; p = 0.002).

Multivariable analysis showed that dasatinib was associated with lower GvHD-free and relapse-free survival vs imatinib (hazard ratio, 1.27; 95% confidence interval, 1–1.62; p = 0.048).

These findings suggest that the choice of TKI (imatinib or dasatinib) has no impact on survival after allo-HCT in Ph+ ALL; however, pre- allo-HSCT dasatinib may raise the risk of severe acute GvHD.

  1. Giebel S, Labopin M, Peric Z, et al. Impact of the type of tyrosine kinase inhibitor (imatinib or dasatinib) used before allo-HCT on outcome of patients with Philadelphia-positive acute lymphoblastic leukemia. A study on behalf of the Acute Leukemia Working Party of the EBMT. Transplant Cell Ther. Online ahead of print. DOI: 10.1016/j.jtct.2024.07.016

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