Long non-coding RNA (lncRNA) MALAT1 was firstly identified in 2003 as transcript associated with metastasis in patients with early-stage of non-small cell lung cancer. Today, it is believed that MALAT1’s primary function is the regulation of expression of genes which products are involved in metastases formation. However, there are currently few publications dealing with association of MALAT1 gene single-nucleotide polymorphisms with the onset of oncological pathologies of different localization, and to investigating its association with various characteristics and stages of tumor process, including metastasis. The purpose of the study was to find possible relation between MALAT1 gene rs3200401 polymorphism and metastasis development in Ukrainian patients with bladder cancer. Materials and methods. Whole venous blood of 141 patients with transitional cell carcinoma of urinary bladder was used for study. Genotyping of MALAT1 gene rs3200401 polymorphic site was performed by Real-time PCR using 7500 Fast Real-time PCR System (Applied Biosystems, Foster City, USA) and Taq-Man Assays (TaqMan®SNP Assay C_3246069_10). Statistical analysis was done using SPSS software package (version 17.0). Binary and multivariable logistic regression techniques were used to find the possible genotype association between MALAT1 gene rs3200401 site and metastasis development. P values > 0.05 were considered to be statistically significant. Results and discussion. The comparative analysis of MALAT1 gene rs3200401 genotypes distribution between patients with and without metastases revealed no significant difference (P = 0.074), while T and C alleles frequencies significantly different between comparison groups (P = 0.015). In addition, it was found out that the risk of metastases development in minor T-allele carriers with transitional cell carcinoma of urinary bladder was 2.2 times higher compared with the individuals with CC-genotype (Pobs=0.048; ORobs=2.207; 95% CI=1.006-4.844). However, after adjustment for age, gender, smoking habits and alcohol abuse the significant association was lost (Padj=0.279; ORadj=0.678; 95% CI=0.335-1.371). Conclusion. The study results showed that there was a relation between MALAT1 gene rs3200401 polymorphism and metastasis development in Ukrainian patients with transitional cell carcinoma of urinary bladder. Minor T allele carriers have higher risk of bladder cancer metastasis onset compared to major C allele homozygotes.
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