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Original Article | Open Access

Prognostic value of BCL2 and TP53 genetic alterations for diffuse large B-cell lymphoma patients treated with R-CHOP

Yan Qin1,*, Haizhu Chen1,*, Peng Liu1, Changgong Zhang1, Jianliang Yang1, Lin Gui1, Xiaohui He1, Liqiang Zhou1, Shengyu Zhou1, Shiyu Jiang1, Hongxin Jiang2, Yuankai Shi1 ( )
Department of Medical Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing Key Laboratory of Clinical Study on Anticancer Molecular Targeted Drugs, Beijing 100021, China
Department of Medical Oncology, Suzhou Municipal Hospital, Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou 215001, China

*These authors contributed equally to this work.

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Abstract

Objective

Limited data about the prognostic significance of BCL2 mutations and BCL2 copy number variations in diffuse large B-cell lymphoma (DLBCL) are available. This study aimed to comprehensively describe BCL2 genetic alterations in DLBCL patients, and examine correlation of BCL2, TP53 and other genetic alterations with outcomes in patients treated with R-CHOP.

Methods

Probe capture-based high-resolution sequencing was performed on 191 patients diagnosed with de novo DLBCL. MYC, BCL2, and BCL6 protein expressions were detected by immunohistochemistry.

Results

The presence of BCL2 alterations significantly correlated with poor progression-free survival (PFS) (5-year PFS: 13.7% vs. 40.8%; P = 0.003) and overall survival (OS) (5-year OS: 34.0% vs. 70.9%; P = 0.036). Importantly, patients who harbored BCL2 gain/amplifications (BCL2GA/AMP) also had a remarkably inferior 5-year PFS (11.1% vs. 38.3%; P < 0.001) and OS (22.1% vs. 69.6%; P = 0.009). In contrast, neither BCL2 mutations nor BCL2 translocations were significantly prognostic for survival. Multivariable analyses showed that the presence of BCL2 alterations, especially BCL2GA/AMP, TP53 mutations, and International Prognostic Index (IPI) were significantly associated with inferior PFS and OS. Novel prognostic models for OS were constructed based on 3 risk factors, including BCL2 alterations (Model 1) or BCL2GA/AMP (Model 2), TP53 mutations, and IPI, to stratify patients into 4 risk groups with different survival outcomes.

Conclusions

This study showed that DLBCL patients treated with R-CHOP, BCL2 alterations, especially BCL2GA/AMP and TP53 mutations were significantly associated with inferior outcomes, which were independent of the IPI. The novel prognostic models we proposed predicted outcomes for DLBCL patients treated with R-CHOP, but further validation of the prognostic models is still warranted.

Keywords

prognosisdiffuse large B-cell lymphomaTP53BCL2genetic alterations

Electronic Supplementary Material

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Cancer Biology & Medicine
Volume 19 Issue 6,
June 2022
Pages 893-909
DOI: 10.20892/j.issn.2095-3941.2021.0193
Cite this article:
Qin Y, Chen H, Liu P, et al. Prognostic value of BCL2 and TP53 genetic alterations for diffuse large B-cell lymphoma patients treated with R-CHOP. Cancer Biology & Medicine, 2022, 19(6): 893-909. https://doi.org/10.20892/j.issn.2095-3941.2021.0193

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Received: 25 March 2021
Accepted: 03 June 2021
Published: 23 November 2021
©2022 Cancer Biology & Medicine.

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