XPD Lys751Gln and Asp312Asn polymorphisms and hepatocellular carcinoma susceptibility: A meta-analysis of 11 case-control studies in an Asian population

ERCC2 rs13181 Polymorphism Association with Glioma Risk: an Update Meta-Analysis

Glioma is the most common type of primary brain tumour which accounts for about 30% of all brain and central nervous system tumours, and approximately 70% of adult malignant brain tumours. Numerous studies have been performed to assess the relationship between ERCC2 rs13181 polymorphism and the risk of glioma development, yet these findings of these studies are often inconsistent and contradictory. Therefore, the aim of this study is to conduct a systematic review and meta-analysis to assess the role of ERCC2 rs13181 in glioma developing. In this work, we have conducted a systematic review and meta-analysis. In order to collect the results of relevant studies on the association of ERCC2 rs13181 gene polymorphism with glioma, we initially searched the Scopus, Embase, Web of Science (WoS), PubMed, and ScienceDirect databases, without a lower time limit, and until June 2020. In order to analyse the eligible studies, the random effects model was used and the heterogeneity of the studies was investigated with the I 2 index. Data analysis was performed within the Comprehensive Meta-Analysis software (version 2). The total number of studies that focused on patients with glioma was 10. The odds ratio of GG vs TT genotype in patients with glioma based on meta-analysis was 1.08 (0.85-1.37: 95% confidence interval), which indicates the increasing effect of GG vs TT genotype by 0.08. The odds ratio of GG + TG vs TT genotype in patients with glioma was 1.22 (1.38-1.7: 95% confidence interval) based on meta-analysis, which indicates the increasing effect of GG + TG vs TT genotype as 0.22. The odds ratio of TG vs TT genotype in patients with glioma was 1.2 (0.38-1.4: 95% confidence interval), which shows the increasing effect of TG vs TT genotype by 0.2. The odds ratio of G vs T genotype in patients with glioma based on the meta-analysis was 1.15 (1.26-1.4: 95% confidence interval), which indicates the increasing effect of G vs T genotype by 0.15. The odds ratio of GG vs TG + TT genotype in patients with glioma based on meta-analysis was 1.22 (1.33-1.45: 95% confidence interval), which indicates the increasing effect of GG vs TG + TT genotype by 0.22. The results of this systematic review and meta-analysis show that ERCC2 rs13181 polymorphism and its genotypes are an important risk factor for genetic susceptibility to glioma tumour.

XPD Polymorphisms and Risk of Hepatocellular Carcinoma and Gastric Cancer: A Meta-Analysis

Background:

Cancer is associated with genetic variants of DNA repair genes that alter DNA repair capacity. The aim of this meta-analysis was to evaluate the relations between the rs13181 and rs1799793 XPD gene polymorphisms and risk for hepatocellular carcinoma (HCC) and gastric cancer.

Methods:

Relevant publications were systematically sought from Web of Science, Pubmed, and China Academic Journals Full-text Database. The selection of eligible studies was performed by 2 independent authors. A total of 32 case-control studies were included. Meta-analyses were undertaken in all study participants and each ethnic group.

Results:

The risk of HCC was significantly increased with the XPD rs13181 G allele (P = 0.028, pooled odds ratio (OR) = 1.36, 95% confidence interval (CI) = 1.03-1.80) in all study participants. A subgroup analysis by ethnicity showed that the association was significant in Chinese (P = 0.009, pooled OR = 1.49, 95% CI = 1.11-2.02), but not in Caucasians (P = 0.619, pooled OR = 1.17, 95% CI = 0.64-2.13). Meta-analysis of the XPD rs1799793 polymorphism and HCC showed an association between its variant T allele and increased HCC risk in all study participants (P = 0.017, pooled OR = 1.23, 95% CI = 1.04-1.46, all Chinese). Our results showed no associations between the XPD rs13181 G allele and rs1799793 T allele and gastric cancer risk (rs13181: P = 0.298, pooled OR = 1.10, 95% CI = 0.92-1.31; rs1799793: P = 0.068, pooled OR = 1.31, 95% CI = 0.98-1.74).

Conclusions:

This meta-analysis demonstrated that the XPD rs13181 G allele and rs1799793 T allele have significant associations with HCC and may be risk factors for HCC in the Chinese population. Current evidence indicated that they are not related to gastric cancer risk.

Association Between the Asp312Asn, Lys751Gln, and Arg156Arg Polymorphisms in XPD and the Risk of Prostate Cancer

Prostate cancer is the most common solid cancer and genetic factors play important roles in its pathogenesis. XPD is one of the 8 core genes involved in the nucleotide excision repair pathway. The relationship between Asp312Asn, Lys751Gln, and Arg156Arg polymorphisms in XPD and prostate cancer risk is a controversial topic. Therefore, we conducted a meta-analysis to explore the relationship between these 3 polymorphisms and the risk of developing prostate cancer. We searched the electronic literature in PubMed and Google Scholar for all relevant studies (last updated January 1, 2017). The pooled odds ratios and 95% confidence intervals for the associations between the Asp312Asn, Lys751Gln, or Arg156Arg polymorphisms in XPD and prostate cancer risk were calculated. To evaluate the effects of specific study characteristics on the association of these 3 polymorphisms and prostate cancer risk, we performed subgroup analysis if 2 or more studies were available. After an extensive literature review, 7 publications regarding Asp312Asn genotype distribution with 8 case–controls, 9 publications regarding Lys751Gln genotype distribution with 10 case–controls, and 3 publications regarding Arg156Arg genotype distribution with 4 case–controls were selected. The results showed that Asp312Asn (odds ratio = 1.34, 95% confidence interval: 0.96-1.87, P = .000), Lys751Gln (odds ratio = 0.98, 95% confidence interval: 0.89-1.08, P = .986), and Arg156Arg (odds ratio = 1.05, 95% confidence interval: 0.91-1.22, P = .57) polymorphisms do not increase the risk of prostate cancer in the dominant model. Further, in the subgroup analysis by ethnicity, no relationships were observed between Lys751Gln and Arg156Arg polymorphisms and prostate cancer risk. However, stratified analysis by ethnicity revealed that Asp312Asn affects African (odds ratio = 1.57, 95% confidence interval: 1.06-2.33, P = .382) and Asian populations (odds ratio = 2.09, 95% confidence interval: 1.39-3.14, P = .396) in homozygote comparison. In conclusion, this meta-analysis suggests that there is no general association between the Asp312Asn, Lys751Gln, and Arg156Arg polymorphisms in XPD and prostate cancer susceptibility.

Roles of XRCC1/XPD/ERCC1 Polymorphisms in Predicting Prognosis of Hepatocellular Carcinoma in Patients Receiving Transcatheter Arterial Chemoembolization

OBJECTIVE

To investigate the potential prognostic roles of polymorphisms in the X-ray repair cross-complementing group 1 (XPCC1), xeroderma pigmentosum group D (XPD) and excision repair cross-complementing group 1 (ERCC1) genes for patients with hepatocellular carcinoma (HCC) receiving transcatheter arterial chemoembolization (TACE).

METHODS

Clinical data and blood samples from 308 HCC patients receiving TACE were collected between January 2010 and December 2013. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RLFP) analyses was used to determine the genotypes of the XPCC1 (rs25487), XPD (rs13181) and ERCC1 (rs11615) genes. The relationships between the genotypes and the efficacy of TACE treatment were analyzed.

RESULTS

The XRCCI rs25487 polymorphism was associated with a favorable prognosis in HCC patients receiving TACE (p = 0.006), and patients carrying variant genotypes (A/A + G/A) were associated with significantly reduced risk of death compared with those with the wild genotype (G/G) (HR = 0.556; 95% CI = 0.354-0.874). These findings were supported by Kaplan-Meier survival curve analysis showing that median survival time for patients with A/A + G/A genotypes was significantly longer compared with those with the G/G genotype (11.2 month vs. 8.0 months; log rank p = 0.006). Stratified analyses revealed that A/A + G/A genotypes of XRCC1 rs25487 are associated with significantly reduced risk of death compared with the G/G genotype in patients grouped by tumor size, portal vein tumor thrombus (PVTT), alpha-fetoprotein (AFP) and TNM stage (all p < 0.05). The ERCC1 rs13181 and XPD rs11615 polymorphisms were not predictive of clinical outcome for HCC patients receiving TACE (both p > 0.05).

CONCLUSION

The XRCC1 rs25487 polymorphisms are prognostic for HCC patients receiving TACE. The ERCC1 and XPD polymorphisms had no relationship to the clinical outcomes.