Clinical impacts of copy number variations in B-cell differentiation and cell cycle control genes in pediatric B-cell acute lymphoblastic leukemia: a single centre experience

IKZF1 gene deletions have been identified as a poor prognostic factor in pediatric B-cell acute lymphoblastic leukemia (B-ALL), especially in the presence of co-occurring deletions (IKZF1^plus profile). This study aimed to determine the frequency of IKZF1 deletions and deletions in other B-cell differentiation and cell cycle control genes, and their prognostic impact in Slovenian pediatric B-ALL patients.

Patients and methods

We studied a cohort of 99 patients diagnosed with B-ALL from January 2012 to December 2020 and treated according to the ALL IC-BFM 2009 protocol. Eighty-eight bone marrow or peripheral blood samples were analysed for copy number variations (CNVs) using the SALSA MLPA P335 ALL-IKZF1 probemix.

Results

At least one CNV was detected in more than 65% of analysed samples. The most frequently altered genes were PAX5 and CDKN2A/B (30.7%, 26.1%, and 25.0%, respectively). Deletions in IKZF1 were present in 18.2% of analysed samples and were associated with an inferior 5-year event-free survival (EFS; 54.8% vs. 85.9%, p = 0.016). The IKZF1^plus profile was identified in 12.5% of the analysed samples, and these patients had an inferior 5-year EFS than those with deletions in IKZF1 only and those without deletions (50.8% vs. 75.0% vs. 85.9%, respectively, p = 0.049). Overall survival (OS) was also worse in patients with the IKZF1^plus profile than those with deletions in IKZF1 only and those without deletions (5-year OS 76.2% vs. 100% vs. 93.0%, respectively). However, the difference between the groups was not statistically significant.

Conclusions

Our results are in concordance with the results obtained in larger cooperative clinical trials. Copy number variations analysis using the SALSA MLPA kit is a reliable tool for initial diagnostic approach in children with B-ALL, even in smaller institutions in low- and middle-income countries.

Lingua:: Inglese

Frequenza di pubblicazione:: 4 volte all'anno
Argomenti della rivista:: Medicina, Medicina clinica, Medicina interna, Ematologia, Oncologia, Radiologia

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Clinical impacts of copy number variations in B-cell differentiation and cell cycle control genes in pediatric B-cell acute lymphoblastic leukemia: a single centre experience

Klementina Crepinsek

Gasper Marinsek

Marko Kavcic

Tomaž Prelog

Lidija Kitanovski

Janez Jazbec

Marusa Debeljak

Categoria dell'articolo: Research Article

Pubblicato online: 22 dic 2021

Pagine: 92 - 101

Ricevuto: 07 set 2021

Accettato: 05 nov 2021

DOI: https://doi.org/10.2478/raon-2021-0050

Parole chiaveB-acute lymphoblastic leukemia, deletions, MLPA, pediatric, copy number variations (CNVs)

© 2022 Klementina Crepinsek, Gasper Marinsek, Marko Kavcic, Tomaž Prelog, Lidija Kitanovski, Janez Jazbec, Marusa Debeljak, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Background

Patients and methods

Results

Conclusions

Parole chiave
B-acute lymphoblastic leukemia, deletions, MLPA, pediatric, copy number variations (CNVs)