OBJECTIVETo explore the association between the common variations of TET2 (rs7679673, A), MTK2 (rs6465657, T) and FAM84B (rs12543663, C) genes and prostate cancer (Pca) risk in Chinese population in Beijing, and to understand the relationship between genotypes and phenotypes including clinical characteristics and life style, etc. in patients with prostate cancer.

METHODSBased on a case-control study, 124 patients with prostate cancer and 138 age-matched control subjects were recruited. Information of clinical phenotype and life style, etc. in the prostate cancer patients was collected. We compared the differences of allele and genotype frequencies of TET2 (rs7679673, A), LMTK2 (rs6465657, T) and FAM84B (rs12543663, C) gene expressions between the two groups for the allele and genotype frequencies, and explored the relationship between different genotypes and clinical features such as patient age, BMI, Gleason score, PSA level and tumor stage, by Chi-square test in patients with PCa. Multifactor dimensionality reduction was used to detect the gene-gene interactions.

RESULTSThe FAM84B (rs12543663, C) C carriers frequency had significant difference between the case group and the control group (χ(2) = 3.980 P = 0.046; OR = 1.883; 95%CI = 1.006-3.526). The allele and genotype frequencies of TET2 gene (rs7679673, A) and LMTK2 gene (rs6465657, T) were not significantly different between the case group and the control group (P > 0.05). Analysis of the genotypes and clinical phenotypes showed that the genetic type of FAM84B C carriers [CX (CC + CA)] were significantly associated with cancer stage (χ(2) = 9.585; P = 0.002; OR = 3.740; 95%CI = 1.580 - 8.853). Association between three loci and 12 kind of relevant outcomes was found in TET2 A carriers and the smoking and drinking patients (all P < 0.05). Significant correlation was also found between LMTK2 (rs6465657, T) TX carriers and surgery (χ(2) = 8.612; P = 0.003; OR = 0.174; 95%CI 0.049 - 0.620). No significant correlation was seen with other covariates (P > 0.05). Dendrogram analysis among the three loci showed that the best model consisted of the three sites (P = 0.0270), cross validation consistency: 10/10, and testing balanced accuracy: 0.5120. There may be gene-gene interaction among TET2 (rs7679673, A), LMTK2 (rs6465657, T), and FAM84B (rs12543663, C).

CONCLUSIONSThere may be obvious association of FAM84B (rs12543663, C) gene with prostate cancer risk and the stages, and the synergistic effects of TET2 (rs7679673, A), LMTK2 (rs6465657, T) and FAM84B (rs12543663, C) genes may have an association with prostate cancer risk in Chinese population.