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. 2024 Nov;38(11):2382-2394.
doi: 10.1038/s41375-024-02395-4. Epub 2024 Sep 11.

Determinants of survival after first relapse of acute lymphoblastic leukemia: a Children's Oncology Group study

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Determinants of survival after first relapse of acute lymphoblastic leukemia: a Children's Oncology Group study

Susan R Rheingold et al. Leukemia. 2024 Nov.

Abstract

Limited prognostic factors have been associated with overall survival (OS) post-relapse in childhood Acute Lymphoblastic Leukemia (ALL). Patients enrolled on 12 Children's Oncology Group frontline ALL trials (1996-2014) were analyzed to assess for additional prognostic factors associated with OS post-relapse. Among 16,115 patients, 2053 (12.7%) relapsed. Relapse rates were similar for B-ALL (12.5%) and T-ALL (11.2%) while higher for infants (34.2%). Approximately 50% of B-ALL relapses occurred late (≥36 months) and 72.5% involved the marrow. Conversely, 64.8% of T-ALL relapses occurred early (<18 months) and 47.1% involved the central nervous system. The 5-year OS post-relapse for the entire cohort was 48.9 ± 1.2%; B-ALL:52.5 ± 1.3%, T-ALL:35.5 ± 3.3%, and infant ALL:21.5 ± 3.9%. OS varied by early, intermediate and late time-to-relapse; 25.8 ± 2.4%, 49.5 ± 2.2%, and 66.4 ± 1.8% respectively for B-ALL and 29.8 ± 3.9%, 33.3 ± 7.6%, 58 ± 9.8% for T-ALL. Patients with ETV6::RUNX1 or Trisomy 4 + 10 had median time-to-relapse of 43 months and higher OS post-relapse 74.4 ± 3.1% and 70.2 ± 3.6%, respectively. Patients with hypodiploidy, KMT2A-rearrangement, and TCF3::PBX1 had short median time-to-relapse (12.5-18 months) and poor OS post-relapse (14.2 ± 6.1%, 31.9 ± 7.7%, 36.8 ± 6.6%). Site-of-relapse varied by cytogenetic subtype. This large dataset provided the opportunity to identify risk factors for OS post-relapse to inform trial design and highlight populations with dismal outcomes post-relapse.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1. Time and site of relapse.
Patterns of first relapse differed between (A) B-ALL, (B) T-ALL, (C) Infant ALL. iBM isolated bone marrow, BM bone marrow, CNS central nervous system, iCNS isolated central nervous system.
Fig. 2
Fig. 2. Overall survival post first relapse.
Kaplan–Meier estimates of overall survival rates post relapse based on (A) mmunophenotype, (B) B-ALL time to relapse, (C) B-ALL site of relapse, (D) B-ALL cytogenetic subtype, (E) T-ALL time to relapse, (F) T-ALL site of relapse, (G) Infant ALL cytogenetic subtype, (H) Infant ALL time to relapse, (I) Infant ALL site of relapse.

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