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Outcomes following induction failure in Japanese children with acute lymphoblastic leukemia

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Abstract

The characteristics and prognosis of Japanese children with acute lymphoblastic leukemia (ALL) who fail to achieve complete remission after remission induction chemotherapy (i.e., experience induction failure) are poorly understood. Therefore, we retrospectively analyzed data of patients enrolled in Japanese clinical trials for newly diagnosed ALL between 1996 and 2009. Among 4956 participants, 89 (1.8%) experienced induction failure. With a 6.0-year median follow-up, the 5-year overall survival rate of the entire cohort was 43.0% ± 5.5%. Survival rates did not differ between patients with B-cell precursor ALL (BCP-ALL) and T-cell ALL (T-ALL). In multivariate analysis, day 15 M3 marrow (bone marrow blast count ≥ 25%) was significantly correlated with poorer survival in the whole or BCP-ALL cohorts. In T-ALL, age < 6 years was significantly associated with poor survival. However, due to the small sample size, this correlation must be further investigated. Most T-ALL and BCR-ABL-positive BCP-ALL patients underwent allogeneic stem cell transplantation (allo-SCT). Survival rates did not differ between BCR-ABL-negative BCP-ALL patients who did and did not undergo allo-SCT, possibly due to the inclusion of lower-risk patients in the latter group. In conclusion, the induction failure rate and survival after diagnosis of induction failure in our study were comparable to previously reported figures.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request. The request must be reviewed and approved by the four participating groups (CCLSG, KYCCSG, JACLS, TCCSG).

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Acknowledgements

We would like to thank all patients and their families. We acknowledge the work of the past and present members of the Childhood Cancer and Leukemia Study Group, Kyushu–Yamaguchi Childhood Cancer Study Group, Japan Association of Childhood Leukemia Study, Tokyo Children’s Cancer Study Group, Japan Pediatric Leukemia/Lymphoma Study Group, and Japan Children’s Cancer Group. We would like to thank Editage (www.editage.com) for English language editing.

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Authors

Contributions

CI, AS, MH, YO, and AM designed the study; TH, YS, SS, TI, JH, DH, HT, KM, SK, DT, HM, TT, KH, and KK provided clinical data from each steering committee of the trials; CI, AS, MH, and YO contributed to the collection and management of individual patient data; CI performed statistical analyses; CI, AS, MH, and YO drafted the manuscript; and all authors have read and approved the final manuscript.

Corresponding author

Correspondence to Chihaya Imai.

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Conflict of interest

CI reports patent royalties from Juno Therapeutics, patent royalties, research funds, and advisory fees from CURED Inc. The other authors have no conflicts of interest to declare.

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Supplementary Information

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12185_2023_3600_MOESM1_ESM.pdf

Supplementary file1 Figure S1. The impact of the use of allogeneic stem cell transplantation on overall survival in non-BCR-ABL BCP-ALL. Kaplan–Meier analysis of OS in non-BCR-ABL BCP-ALL is shown. Black and red lines indicate patients treated with or without SCT, respectively. (PDF 52 KB)

Supplementary file2 (DOCX 24 KB)

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Imai, C., Sato, A., Hiwatari, M. et al. Outcomes following induction failure in Japanese children with acute lymphoblastic leukemia. Int J Hematol 118, 99–106 (2023). https://doi.org/10.1007/s12185-023-03600-3

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  • DOI: https://doi.org/10.1007/s12185-023-03600-3

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