Molecular histological characteristics of breast tumors for women from the Kyrgyz population - the contribution of the genes <i>TP53</i>, <i>XRCC1</i> and <i>MDM2</i>
The study included 100 women of the Kyrgyz ethnic group with the morphologically verified diagnosis of breast cancer (BC) from National cancer center of Bishkek (Kyrgyz Republic) in the period 2013-2015 years. The average age of patients with breast cancer was 47,6 ± 10,0 years (age interval is 23,5-74,1 years). Genotyping of single-nucleotide polymorphisms (SNPs) p.Q399R ( XRCC1 ), p.R194W ( XRCC1 ), p.P72R ( TP53 ) and c.309T>G ( MDM2 ) was performed using PCR-RFLP. Comparison of results of the analysis of genotyping and morphological characteristics of a tumor node in the examined subgroups used the Fisher's exact test. For comparison of quantitative data after checking for homoscedasticity and the normality of distribution using the method of variance analysis ANOVA. Statistical data processing was performed using Microsoft Excel (Microsoft Corporation, USA) and SPSS v.20.0 (IBM, USA). For SNPs p.P72R ( TP53 ) and p.R194W ( XRCC1 ) there are a statistically significant association with age verification of diagnosis of breast cancer. For 78,0% (71/91) of the patients with genotype CG/GG for SNP p.P72R ( TP53 ) was diagnosed to 55 years, for 55,6% (5/9) of the patients with genotype CC was diagnosed after 55 years, p = 0,041. For the polymorphism p.R194W ( XRCC1 ) were shown statistically significant association with age verification of diagnosis of breast cancer: for patients with genotype CC of the calculated value made up of 46,12 ± 10,21 years, for patients with genotypes TT/CT - of 50,98 ± 8,70, p = 0,024. At the same time, multivariate analysis of variance no showed relationship between age verification of breast cancer diagnosis and genotyping data at the SNPs p.Q399R ( XRCC1 ), p.R194W ( XRCC1 ), p.P72R ( TP53 ) and c.309T>G ( MDM2 ). Also revealed no statistically significant differences between the results of genotyping and histological type of the tumor, the values of the TNM-classification and the degree of differentiation of the tumor.