Abstract
Background
Diffuse large B-cell lymphoma (DLBCL) is a clinically heterogeneous malignancy. Following front-line immunochemotherapy, 30–40% of DLBCL patients develop relapsed or refractory (r/r) disease, which can be treated with ibrutinib. It has been previously reported that MYD88MUT affects the response to ibrutinib in patients with r/r DLBCL.
Objective
Here, we aimed to gather understanding of MYD88MUT in r/r DLBCL patients and to evaluate its influence on response to ibrutinib.
Patients and Methods
In this study, tissue samples from DLBCL patients (n = 212) were retrospectively collected and sequenced by target-capturing panels of either 413 or 112 genes that are frequently mutated in non-Hodgkin’s lymphoma. Sixty patients with MYD88 mutations and available clinical information were included for further analysis.
Results
Seven MYD88MUT variants were identified, L265P (65.0%, n = 39), S219C (13.3%, n = 8), S243N (8.3%, n = 5), P258L (6.7%, n = 4), F283V (1.7%, n = 1), P141R (1.7%, n = 1), and V217F (1.7%, n = 1). One patient had MYD88 amplification. In addition, mutations in PIM1 (67%, n = 40), IGH fusion (48%, n = 29), CD79B (43%, n = 26), KMT2D (30%, n = 18), and TP53 (27%, n = 17) were identified. For patients with L265P, IRF4 (p = 0.011) was frequently mutated. Otherwise, TET2 (p = 0.016), NOTCH2 (p = 0.044), MET (p = 0.037), SOCS1 (p = 0.011), TNFRSF14 (p = 0.011), EZH2 (p = 0.037), and BCL6 (p < 0.001) mutations were associated with MYD88MUT non-L265P variants. The incidence rate of MYD88MUT L265P was significantly higher with central nervous system involvement (p = 0.034). Four out of nine MYD88MUT patients responded to ibrutinib containing treatment, and this included those with MYD88MUT/CD79BWT.
Conclusions
This study adds clinical observations with MYD88MUT patients, further helping to understand the genetic features and possible correlation of MYD88MUT with response to ibrutinib.
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Acknowledgements
We thank all the patients, their families, and all the investigators who participated in the study.
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Contributions
YKS, YQ, and SYJ conceptualized and designed the study. YKS, SYJ, YQ, LG, HXJ, BL, JLY, SY, XHH, and SYZ reviewed the literature, collected data, and interpreted the findings. SYJ, XHD, YTY, and JL performed statistical analysis. YKS, YQ, and SYJ drafted the manuscript. All authors reviewed and approved the final manuscript.
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Funding
This study was supported by the National Key Technology Support Program (2014BAI09B12), National New Drug Innovation Program (2017ZX09304015), Beijing-Tianjin-Hebei Cooperation Program for basic research under Grant H2018206591, and the Chinese Academy of Medical Sciences (CAMS) Innovation Fund for Medical Sciences (CIFMS) (2016-I2M-1-001).
Conflict of Interest
Jing Lin is an employee of Burning Rock Biotech. Xinhua Du and Yuting Yi are employees of Geneplus-Beijing. Shiyu Jiang, Yan Qin, Lin Gui, Peng Liu, Hongxin Jiang, Biao Liu, Jianliang Yang, Sheng Yang, Xiaohui He, Shengyu Zhou, and Yuankai Shi declare that they have no conflicts of interest that might be relevant to the contents of this article.
Ethics Approval and Consent to Participate
The study was approved by the Review Board of Cancer Institute and Hospital, Chinese Academy of Medical Sciences and conducted in accordance with the Declaration of Helsinki. Consent to publish was obtained from the participants for reporting individual patient data.
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Jiang, S., Qin, Y., Gui, L. et al. Genomic Alterations and MYD88MUT Variant Mapping in Patients with Diffuse Large B-Cell Lymphoma and Response to Ibrutinib. Targ Oncol 15, 221–230 (2020). https://doi.org/10.1007/s11523-020-00710-4
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DOI: https://doi.org/10.1007/s11523-020-00710-4