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Evaluation of polymorphism in BCL-2, PD-1, and PD-L1 genes in myelodysplastic neoplasms

Bartłomiej Kuszczak1, Piotr Łacina2, Marta Dratwa-Kuźmin2, Katarzyna Bogunia-Kubik2, Tomasz Wróbel1, Justyna Rybka1

Abstract

BCL-2 family proteins regulate apoptosis, while programmed cell death protein 1 (PD-1) and programmed death-ligand 1 (PD-L1) act as negative regulators of the immune system. An association has been found between abnormalities in B-cell CLL/lymphoma 2 (BCL-2) and PD-1/PD-L1 proteins and susceptibility to myelodysplastic neoplasms. The aim of this study was to assess polymorphisms in genes encoding BCL-2, PD-1, and PD-L1, and their impact on the clinical course of myelodysplastic neoplasms (MDS), treatment effectiveness, and correlation with other prognostic factors in MDS. The study included 50 individuals with a median age of 70 diagnosed with MDS. Genotyping for BCL2 (rs1564483, rs2279115), CD274 (rs2297136, rs4143815), and PDCD1 (rs10204525, rs2227981) was performed using LightSNiP assays. Real-time PCR reactions were conducted on a LightCycler 480 II device. Mann-Whitney U test and Fisher’s exact test were employed for analysis. Kaplan-Meier curves and the log-rank test were used for survival analysis. The analysis revealed that the BCL2 rs1564483 G allele is associated with better overall survival compared to patients with the BCL2 rs1564483 AA genotype (p=0.037) and is more common in patients who achieved complete remission (CR) or partial remission (PR) after first-line treatment (regardless of the therapy used) (p=0.021).

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