Association of HOTAIR, MIR155HG, TERC, miR-155, -196a2, and -146a Genes Polymorphisms with Papillary Thyroid Cancer Susceptibility and Prognosis.

Polymorphisms in long non-coding RNA and microRNA genes may play a significant role in the susceptibility and progression of papillary thyroid carcinoma (PTC). The current study investigates the polymorphisms HOTAIR rs920778, MIR155HG rs1893650, TERC rs10936599, miR-155 rs767649, miR-196a2 rs11614913 and miR-146a rs2910164 in 102 PTC patients and 106 age- and sex-matched controls of the Caucasian Serbian population, using real-time PCR. We observed differences in genotype distributions of the HOTAIR rs920778 ( = 0.016) and MIR155HG rs1893650 ( = 0.0002) polymorphisms between PTC patients and controls. HOTAIR rs920778 was associated with increased PTC susceptibility (adjusted OR = 1.497, = 0.021), with the TT variant genotype increasing the risk compared to the CC genotype (OR = 2.466, = 0.012) and C allele carriers (CC + CT) (OR = 1.585, = 0.006). The HOTAIR rs920778 TT genotype was associated with lymph node metastasis ( = 0.022), tumor recurrence ( = 0.016), and progression-free survival ( = 0.010) compared to C allele carriers. Multivariate Cox regression revealed that ATA risk (HR = 14.210, = 0.000004) and HOTAIR rs920778 (HR = 2.811, = 0.010) emerged as independent prognostic factors in PTC. A novel polymorphism, MIR155HG rs1893650, was negatively correlated with susceptibility to PTC, with TC heterozygotes exerting a protective effect (OR = 0.268, = 0.0001). These results suggest that the polymorphisms HOTAIR rs920778 and MIR155HG rs1893650 could be potential prognostic and risk biomarkers in papillary thyroid carcinomas.