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Published in: BMC Cancer 1/2021

01-12-2021 | Acute Lymphoblastic Leukemia | Research article

Low incidence of ABL-class and JAK-STAT signaling pathway alterations in uniformly treated pediatric and adult B-cell acute lymphoblastic leukemia patients using MRD risk-directed approach – a population-based study

Authors: Rimvydas Norvilas, Vaidas Dirse, Ruta Semaskeviciene, Orinta Mickeviciute, Egle Gineikiene, Mindaugas Stoskus, Goda Vaitkeviciene, Jelena Rascon, Laimonas Griskevicius

Published in: BMC Cancer | Issue 1/2021

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Abstract

Background

ABL-class and JAK-STAT signaling pathway activating alterations have been associated with both a poor post-induction minimal residual disease (MRD) response and an inferior outcome in B-cell acute lymphoblastic leukemia (B-ALL). However, in most of the studies patients received non-uniform treatment.

Methods

We performed a population-based analysis of 160 (122 pediatric and 38 adult) Lithuanian BCR-ABL1-negative B-ALL patients who had been uniformly treated according to MRD-directed NOPHO ALL-2008 protocol. Targeted RNA sequencing and FISH analysis were performed in cases without canonical B-ALL genomic alterations (high hyperdiploids and low hypodiploids included).

Results

We identified ABL-class fusions in 3/160 (1.9%) B-ALL patients, and exclusively in adults (p = 0.003). JAK-STAT pathway fusions were present in 4/160 (2.5%) cases. Of note, P2RY8-CRLF2 fusion was absent in both pediatric and adult B-ALL cases. Patients with ABL-class or JAK-STAT pathway fusions had a poor MRD response and were assigned to the higher risk groups, and had an inferior event-free survival (EFS) / overall survival (OS) compared to patients without these fusions. In a multivariate analysis, positivity for ABL-class and JAK-STAT fusions was a risk factor for worse EFS (p = 0.046) but not for OS (p = 0.278) in adults.

Conclusions

We report a low overall frequency of ABL-class and JAK-STAT fusions and the absence of P2RY8-CRLF2 gene fusion in the Lithuanian BCR-ABL1 negative B-ALL cohort. Future (larger) studies are warranted to confirm an inferior event-free survival of ABL-class/JAK-STAT fusion-positive adult patients in MRD-directed protocols.
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Metadata
Title
Low incidence of ABL-class and JAK-STAT signaling pathway alterations in uniformly treated pediatric and adult B-cell acute lymphoblastic leukemia patients using MRD risk-directed approach – a population-based study
Authors
Rimvydas Norvilas
Vaidas Dirse
Ruta Semaskeviciene
Orinta Mickeviciute
Egle Gineikiene
Mindaugas Stoskus
Goda Vaitkeviciene
Jelena Rascon
Laimonas Griskevicius
Publication date
01-12-2021
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2021
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-020-07781-6

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