MiR-146a expression and the miR-146a gene variant rs2910164 as diagnostic and prognostic biomarkers of oral cancer

Abstract

This study aimed to analyze the diagnostic and prognostic significance of miR-146a-5p in oral cancer and the association of the rs2910164 gene variant with miR-146a-5p expression. Thirty-five oral cancer patients participated in the study. Expression of miR-146a-5p in oral cancer, adjacent noncancerous tissue, and the rs2910164 genotype variant were examined by real-time PCR. No difference was observed in miR-146a-5p expression between cancerous and non-cancerous tissues (P=0.272). It was concluded that miR-146a-5p is not a good diagnostic biomarker. There was no difference in miR- 146a-5p expression depending on the rs2910164 genotype. The rs2910164 variant was associated with tumor histological grade (P=0.037), stage (P=0.036), and lymph node status (P=0.025). There was a difference in survival between oral cancer patients with high and low miR-146a-5p expression (P=0.026), but not between patients with the GG and GC genotypes (P=0.400). Oral cancer patients with the wild-type GG genotype and high miR-146a-5p expression had significantly shorter survival when compared to patients with miR-146a-5p expression below the optimal cut-off and the wild-type genotype (P=0.035). A high miR-146a-5p level could be considered a potential biomarker of poor survival in patients with oral cancer, especially in those with the wild-type GG genotype of the rs2910164 variant.