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This study aimed to investigate the combined impact of IKZF1 deletions/high expression of CRLF2 on the prognosis of pediatric B-cell precursor acute lymphoblastic leukemia (BCP-ALL). IKZF1 deletions and CRLF2 expression were assessed in bone marrow samples from 117 children with newly diagnosed BCP-ALL. Sixteen (13.7%) patients were found to harbor IKZF1 deletions, which was associated with inferior outcomes. The event-free survival (EFS) for patients with high -CRLF2 expression was significantly worse than that for low -CRLF2 expression. Moreover, combined modeling of IKZF1+ /CRLF2 high identified 7.8% of cases as the highest risk subgroup (7-year EFS 33.3 ± 15.7%). In a multivariate analysis, IKZF1+ /CRLF2 high remained a strong independent prognostic factor for EFS (HR: 14.263, p = 0.019). IKZF1 deletions and high -CRLF2 expression were associated with inferior outcomes, and the coexistence of IKZF1+ /CRLF2 high had a significant impact on an integrated prognostic model for high-risk BCP-ALL.


Lei Cui, Chao Gao, Chan-Juan Wang, Xiao-Xi Zhao, Wei-Jing Li, Zhi-Gang Li, Hu-Yong Zheng, Tian-You Wang, Rui-Dong Zhang. Combined analysis of IKZF1 deletions and CRLF2 expression on prognostic impact in pediatric B-cell precursor acute lymphoblastic leukemia. Leukemia & lymphoma. 2021 Feb;62(2):410-418

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PMID: 33054468

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