Objective To assess the association between MTHFR C677T polymorphism and gastric cancer in Chinese population. Methods Relevant literatures were searched from PubMed, EMBASE, Web of Science, China Biology Medicine Database, Chinese Science and Technology Academic Journal, Chinese Journal Full-Text Database, and Wanfang database, the period ranged from their inception to June 2016, and then meta analysis was performed by Stata 10.0 software. Results A meta-analysis of 13 case-control studies enrolled was performed, including 2 569 gastric cancer patients and 3 495 controls. Results of meta-analysis showed that, in Chinese population, CC was a protective factor for gastric cancer comparing with CT 〔OR=0.75, 95% CI is (0.67, 0.85), P=0.001〕 , CT was a protective factor for gastric cancer comparing with TT 〔OR=0.77, 95% CI is (0.68, 0.89), P=0.001〕 , CC was a protective factor for gastric cancer comparing with TT 〔OR=0.56, 95% CI is (0.49, 0.65), P=0.02〕 , CC was a protective factor for gastric cancer comparing with CT+TT 〔OR=0.68, 95% CI is (0.61, 0.76), P=0.001〕 , CC+CT was a protective factor for gastric cancer comparing with TT 〔OR=0.73, 95% CI is (0.60, 0.89), P=0.002〕 . Conclusion There is association between MTHFR C677T polymorphism and gastric cancer in Chinese population.
Objective To investigate association between –174C/G genetic polymorphism of interleukin-6 (IL-6) and susceptibility to gastric cancer by conducting a meta-analysis. Methods Such databases as PubMed, Embase, The Cochrane Library, Web of Science, CNKI, VIP, and Wanfang Data were searched from inception to January 2017 to collect case-control studies about the correlation between the –174C/G genetic polymorphism of IL-6 and susceptibility to gastric cancer. For the population genotype distributions of both the gastric cancer group and the control group, their odds ratios (OR) and 95% confidence intervals (CI) were taken as the effect indexes were applied to conduct meta-analysis in the homozygote model (CC vs. GG), heterozygote model (GC vs. GG), dominant model (CC+CG vs. GG), recessive model (CG+GG vs. CC), and allelic genetic model (C vs. G). Two reviewers independently screened the literatures, extracted the data, and evaluated the quality of the included studies. The meta-analysis was performed using Stata 12.0 software. Results Thirteen articles were included in the final meta-analysis, covering a total of 2 062 gastric cancer cases and 3 152 controls. The results of meta-analysis showed that there was no correlation between the IL-6 –174C/G genetic polymorphism and the risk of gastric cancer〔CC vs. GG: OR=1.33, 95% CI (0.92, 1.94); GC vs. GG: OR=1.32, 95% CI (0.96, 1.82); CC+CG vs. GG: OR=1.32, 95% CI (0.97, 1.80); CG+GG vs. CC: OR=0.89, 95% CI (0.67, 1.17); C vs. G: OR=1.22, 95% CI (0.98, 1.54)〕. But the results of the subgroup analysis showed there was a significant association between the IL-6 –174 C/G genetic polymorphism and the risk of gastric cancer in Asians〔CC vs. GG: OR=1.80, 95% CI (1.29, 2.50); GC vs. GG: OR=1.51, 95% CI (1.20, 1.90); CC+CG vs. GG: OR=1.60, 95% CI (1.30, 1.96); CG+GG vs. CC: OR=0.60, 95% CI (0.44, 0.83); C vs. G: OR=1.59, 95% CI (1.24, 2.03)〕. However, no association was found in Europeans〔CC vs. GG: OR=1.11, 95% CI (0.90, 1.39); GC vs. GG: OR=1.16, 95% CI (0.98, 1.37); CC+CG vs. GG: OR=1.12, 95% CI (0.96, 1.32); CG+GG vs. CC: OR=1.07, 95% CI (0.88, 1.30); C vs. G: OR=1.04, 95% CI (0.78, 1.41)〕 . Conclusion IL-6 –174C/G genetic polymorphism is associated with susceptibility to gastric cancer in Asians, which is not associated with susceptibility to gastric cancer in Europeans.
Objective To evaluate the association between methylene tetrahydrofolate reductase (MTHFR) A1298C polymorphism and breast cancer in the Asain population. Methods PubMed, EMBASE, Web of science, Chinese Biomedical Literature Database, Chinese Science and Technology Academic Periodical Database, Chinese Journal Full-Text Database, and Wanfang Database were searched to identify relevant articles that investigated the association of MTHFR A1298C polymorphism with breast cancer, the articles published time was from inception of database to March 2017. A meta-analysis was performed by using the Stata 12.0 software. Results A meta-analysis of 19 case-control studies was performed including 7 454 cases of breast cancer and 8 255 controls. The results of meta-analysis suggested that there was no significant association between MTHFR A1298C polymorphism and breast cancer for the Asain population under five genetic models 〔AA vs AC: OR=0.97, 95% CI was (0.91, 1.04), P=0.374; AC vs CC: OR=0.87, 95% CI was (0.75, 1.01）, P=0.060; AA vs CC: OR=0.87, 95% CI was (0.76, 1.01), P=0.061; AA+AC vs CC: OR=0.88, 95% CI was (0.76, 1.01), P=0.061; AC+CC vs AA: OR=0.99, 95% CI was (0.93, 1.06), P=0.737〕. Conclusion MTHFR A1298C polymorphism is not associated with breast cancer in the Asain population.
Objective To explore the correlation of adiponectin rs2241766 gene polymorphism and colorectal cancer. Methods Case-control studies about correlation of adiponectin rs2241766 gene polymorphisms and colorectal cancer were searched by computer retrieval on PubMed, Sciencedirect, Embase, the Cochrane Database, OVID Medline, Springer Link, EBSCO Database, CNKI, VIP, Wanfang, and Chinese Biomedicine Database, the retrieval time was from inception of database to September 30, 2017. At the same time, collected similar literatures and references by manual retrieval. Two independent researchers took the mask of study selection and data extraction, Review Manager 5.3 software was used on calculation results with the OR value and 95% confidence interval (95% CI), on the condition of 5 kinds of gene models. Results A total of 10 case-control studies were included, including 3 460 cases of colorectal cancer and4 170 controls. Results of meta-analysis showed the effect of 5 kinds of model. ① Allele gene model (G vs T): in general population and Yellow race, allele gene model was related to occurrence of colorectal cancer [ORtotal=1.15, 95% CI was (1.07, 1.24), P=0.000 1; ORYellow race=1.16, 95% CI was (1.08, 1.26), P=0.000 1], but there was no significant difference on relationship between allele gene model and occurrence of colorectal cancer for White [ORWhite=1.08, 95% CI was (0.89, 1.30), P=0.44]. ② Dominant gene model (TG+GG vs TT): in general population and Yellow race, dominant gene model was related to occurrence of colorectal cancer [ORtotal=1.23, 95% CI was (1.12, 1.35), P<0.000 1;ORYellow race=1.24, 95% CI was (1.12, 1.37), P=<0.000 1], but there was no significant difference on relationship between dominant gene model and occurrence of colorectal cancer for White [ORWhite=1.17, 95% CI was (0.93, 1.46), P=0.17]. ③ Implicit gene model (GG vs TT+TG): there was no significant difference on relationship between implicit gene model in 3 kinds of population and occurrence of colorectal cancer [general population: ORtotal=1.09, 95% CI was (0.92, 1.30), P=0.32; White: ORWhite=0.77, 95% CI was (0.46, 1.28), P=0.31; Yellow race: ORYellow race=1.15, 95% CI was (0.95, 1.39), P=0.15]. ④ Codominant gene model (TG vs TT): in general population and Yellow race, codominant gene model was related to occurrence of colorectal cancer [ORtotal=1.20, 95% CI was (1.10, 1.32), P<0.000 1;ORYellow race=1.19, 95% CI was (1.08, 1.32), P=0.000 6], but there was no significant difference on relationship between codominant gene model and occurrence of colorectal cancer for White [ORWhite=1.25, 95% CI was (0.99, 1.58), P=0.06]. ⑤ Superdominant gene model (TT+GG vs TG): in general population and Yellow race, superdominant gene model was related to occurrence of colorectal cancer [ORtotal=0.83, 95% CI was (0.76, 0.91), P<0.000 1;ORYellow race=0.84, 95% CI was (0.76, 0.93), P=0.000 6], but there was no significant difference on relationship between superdominant gene gene model and occurrence of colorectal cancer for White [ORWhite=0.80, 95% CI was (0.63, 1.01), P=0.06]. Conclusion The polymorphism of adiponectin gene rs2241766 is related to the occurrence of colorectal cancer in the Yellow race, but there is no significant correlation in White.
Objective To evaluate the associations of 16 variants in clopidogrel-relevant genes with early neurological deterioration (END) in acute ischemic stroke (AIS) patients receiving clopidogrel treatment. Methods AIS patients admitted to the Department of Neurology of three hospitals between June 2014 and January 2015 were included. The 16 variants in clopidogrel-relevant genes were examined using mass spectrometry. Gene-gene interactions were analyzed by generalized multifactor dimensionality reduction (GMDR) methods. The primary outcome was END within the 10 days of admission. Results A total of 375 patients with AIS were included. Among the 375 patients, 95 (25.33%) patients developed END within the first 10 days of admission. Among the 16 variants, only CYP2C19*2 rs4244285 AG+AA was associated with END using single-locus analytical approach (P<0.001). GMDR analysis revealed that there was a synergistic effect of gene-gene interactions among CYP2C19*2 rs4244285, P2Y12 rs16863323, and GPⅢa rs2317676 on risk for END (P=0.019). Cox regression analysis showed that the high-risk interactive genotype was independent predictor for END [hazard ratio=2.184, 95% confidence interval (1.472, 3.238), P=0.004]. Conclusions END is very common in patients with AIS. Interactions among CYP2C19*2 rs4244285, P2Y12 rs16863323, and GPⅢa rs2317676 may confer a higher risk for END. It may be very important to modify clopidogrel therapy for the patients carrying the high-risk interactive genotype.