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Published in: Annals of Hematology 11/2023

19-08-2023 | Fluorescence in Situ Hybridization | Original Article

Dominant-negative type of IKZF1 deletion showed a favorable prognosis in adult B-cell acute lymphoblastic leukemia

Authors: Hiroyuki Kimura, Masahiro Onozawa, Shota Yoshida, Naoki Miyashita, Shota Yokoyama, Toshihiro Matsukawa, Shinsuke Hirabayashi, Hideki Goto, Tomoyuki Endo, Satoshi Oguri, Shinichi Fujisawa, Akio Mori, Takeshi Kondo, Daisuke Hidaka, Kohei Okada, Shuichi Ota, Yasutaka Kakinoki, Yutaka Tsutsumi, Satoshi Yamamoto, Takuto Miyagishima, Junichi Hashiguchi, Takahiro Nagashima, Makoto Ibata, Kentaro Wakasa, Yoshihito Haseyama, Katsuya Fujimoto, Toshimichi Ishihara, Hajime Sakai, Takanori Teshima

Published in: Annals of Hematology | Issue 11/2023

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Abstract

IKZF1 deletion is a recurrent genomic alteration in B-cell acute lymphoblastic leukemia (B-ALL) and is divided into dominant-negative (DN) and loss of function (LOF) deletions. The prognostic impact of each deletion has not been fully elucidated. We retrospectively analyzed 117 patients with adult B-ALL including 60 patients with BCR::ABL1-positive B-ALL and 57 patients with BCR::ABL1-negative B-ALL by the fluorescence in situ hybridization (FISH) method for IKZF1 deletion and multiplex PCR for the 4 most common IKZF1 deletions (∆4–7, ∆2–7, ∆2–8, and ∆4–8). Samples, in which IKZF1 deletion was detected by FISH but a specific type of deletion was not identified by the PCR, were categorized as “other.” Patients were classified into a DN group that had at least 1 allele of ∆4–7 (n = 23), LOF and other group (n = 40), and wildtype group (n = 54). DN type IKZF1 deletions were found in 33.3% of BCR::ABL1-positive cases and 5.2% of BCR::ABL1-negative cases. LOF and other type IKZF1 deletions were found in 43.4% of BCR::ABL1-positive cases and 24.6% of BCR::ABL1-negative cases. Patients with the DN group showed significantly higher overall survival (OS) than that of the LOF and other and WT groups (P = 0.011). Multivariate analysis including age, WBC counts, complex karyotype, and DN type IKZF1 deletion showed that the DN type of IKZF1 deletion (HR = 0.22, P = 0.013) had a positive impact and age ≥ 65 (HR = 1.92, P = 0.029) had a negative impact on OS. The prognostic impact of IKZF1 deletion depends on the type of deletion and DN type of IKZF1 deletion showed better prognosis in adult B-ALL patients.
Clinical trial registration This study was part of a prospective observational study (Hokkaido Leukemia Net, UMIN000048611). It was conducted in compliance with ethical principles based on the Helsinki Declaration and was approved by the institutional review board of Hokkaido University Hospital (#015–0344).
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Metadata
Title
Dominant-negative type of IKZF1 deletion showed a favorable prognosis in adult B-cell acute lymphoblastic leukemia
Authors
Hiroyuki Kimura
Masahiro Onozawa
Shota Yoshida
Naoki Miyashita
Shota Yokoyama
Toshihiro Matsukawa
Shinsuke Hirabayashi
Hideki Goto
Tomoyuki Endo
Satoshi Oguri
Shinichi Fujisawa
Akio Mori
Takeshi Kondo
Daisuke Hidaka
Kohei Okada
Shuichi Ota
Yasutaka Kakinoki
Yutaka Tsutsumi
Satoshi Yamamoto
Takuto Miyagishima
Junichi Hashiguchi
Takahiro Nagashima
Makoto Ibata
Kentaro Wakasa
Yoshihito Haseyama
Katsuya Fujimoto
Toshimichi Ishihara
Hajime Sakai
Takanori Teshima
Publication date
19-08-2023
Publisher
Springer Berlin Heidelberg
Published in
Annals of Hematology / Issue 11/2023
Print ISSN: 0939-5555
Electronic ISSN: 1432-0584
DOI
https://doi.org/10.1007/s00277-023-05405-0

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