|Year : 2013 | Volume
| Issue : 2 | Page : 187-192
Genetic polymorphisms of xeroderma pigmentosum group D and prostate cancer risk: A meta-analysis
Hongcheng Zhu1, Songyu Cao2, Yun Liu3, Xiangxiang Ding3, Qianqian Wu3, Hongxia Ma2
1 Department of Epidemiology and Biostatistics, Ministry of Education Key Lab for Modern Toxicology, School of Public Health; The First Clinical Medical College, Nanjing Medical University, Nanjing 210029, China
2 Department of Epidemiology and Biostatistics, Ministry of Education Key Lab for Modern Toxicology, School of Public Health, Nanjing, China
3 The First Clinical Medical College, Nanjing Medical University, Nanjing 210029, China
|Date of Web Publication||13-Jun-2013|
Department of Epidemiology and Biostatistics, School of public health, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029
Source of Support: A project funded by the Priority Academic Program
Development of Jiangsu Higher Education Institutions (PAPD),, Conflict of Interest: None
Introduction: The Xeroderma pigmentosum group D (XPD, also referred to as excision repair cross complementing gene 2, ERCC2) is one of key genes involved in nucleotide excision repair and two potentially functional polymorphisms of XPD (Asp312Asn and Lys751Gln) have been widely investigated in various cancers including prostate cancer. However, the results were conflicting rather than conclusive.
Aims: Thus, we conducted a meta-analysis to evaluate the associations between these two polymorphisms of XPD and the risk of prostate cancer.
Materials and Methods: An electronic search of PubMed and Embase was conducted to select relevant studies. Studies containing available genotype frequencies of XPD Asp312Asn and Lys751Gln were chosen, and the associations were assessed by pooled odds ratios with 95% confidence intervals.
Results: According to PubMed and Embase databases, we identified seven eligible studies from six articles, including 2641 cases and 3259 controls for Asp312Asn and nine eligible studies from eight articles, including 3255 cases and 3654 controls for Lys751Gln. The meta-analysis showed that no overall association was observed between XPD Asp312Asn and prostate cancer risk. However, the significantly increased risk of 312Asp allele was found among Asians and Africans, but it seemed to be protective in Caucasians when stratified by ethnicity. For XPD Lys751Gln, overall findings had implicated null effects.
Conclusion: These findings indicated that the Asn allele of XPD Asp312Asn might be a risk-factor for developing prostate cancer among Asian and African men but protective for Caucasian population.
Keywords: Excision repair cross complementing gene 2, meta-analysis, polymorphism, prostate cancer, xeroderma pigmentosum group D
|How to cite this article:|
Zhu H, Cao S, Liu Y, Ding X, Wu Q, Ma H. Genetic polymorphisms of xeroderma pigmentosum group D and prostate cancer risk: A meta-analysis. J Can Res Ther 2013;9:187-92
|How to cite this URL:|
Zhu H, Cao S, Liu Y, Ding X, Wu Q, Ma H. Genetic polymorphisms of xeroderma pigmentosum group D and prostate cancer risk: A meta-analysis. J Can Res Ther [serial online] 2013 [cited 2019 Sep 17];9:187-92. Available from: http://www.cancerjournal.net/text.asp?2013/9/2/187/113345
| > Introduction|| |
Prostate cancer (PCa) is one of the most common non-cutaneous cancers in the world, accounting for 10% cancer-related death among men.  The etiology of PCa is still not fully understood, while both genetic and environmental factors may contribute to the risk of this disease.  Studies have shown that endogenous (e.g., inflammation, androgens) and exogenous (e.g., fat, environmental toxins) compounds can damage DNA and induce the instability of genome, ,,, but DNA repair mechanisms protect the genome from DNA damage caused by such agents. Accumulating evidence indicates that genetic variants, such as single nucleotide polymorphisms (SNPs) in the DNA repair genes may affect the DNA repair capacity (DRC) and risk of cancers. 
Among four main DNA repair pathways, nucleotide excision repair (NER) is an important one, which is responsible for removing bulky lesions and simple base modifications.  The xeroderma pigmentosum group D (XPD, also referred to as excision repair cross complementing gene 2, ERCC2) gene, is a vital subunit of the general transcription factor II H (TFIIH), which is not only involved in transcription but is also an essential component of the NER pathway. , Studies have shown that different mutations in the XPD gene diminish the helicase activity and evidently result in a defect in NER and transcription activities. ,, A lot of molecular epidemiological studies have explored the associations between SNPs in XPD gene and cancer risk, including PCa. Among them, Asp312Asn (rs1799793, mapped at exon 10, G > A) and Lys751Gln (rs13181, mapped at exon 23, A > C) had been most widely investigated. Studies have shown these two SNPs may be potentially functional and associated with decreased DRC, increased frequency of p53 mutations, and increased tumor risks. ,,,,,,,, For the associations between XPD Asp312Asn polymorphisms and PCa risk, the results were inconclusive. For example, Rybicki et al., first reported that XPD 312Asn allele exerted a modest positive effect on increasing PCa risk through a family-based case-control study in the United States. Bau et al., and Mandal et al., also found that 312Asn was associated with the increased risk of PCa in Asians . ,, However, some other studied ,, found no association between this SNP and PCa risk. For XPD Lys751Gln polymorphisms, all eligible articles reported that there was no significant association between this SNP and PCa risk, but the evidence was not strong enough in each single study because of a relative small sample size. ,,,,,,,
Therefore, we performed a comprehensive meta-analysis including all the eligible studies on these two SNPs and PCa risk to derive a more precise estimation for the associations of the both polymorphisms (XPD Asp312Asn and Lys751Gln) with PCa risk.
| > Materials and Methods|| |
Literature search strategy
Eligible studies were identified by searching the PubMed and Embase databases for relevant reports before March 6 th 2012 using the following search terms: "DNA repair gene or XPD or ERCC2", "polymorphism or polymorphisms" and "prostate cancer (PCa)". Besides, additional studies were identified from references of the original articles. Studies meeting all of the following criteria were included in our meta-analysis: (1) published in English, (2) case-control study design, (3) detailed Asp312Asn or Lys751Gln genotype information, (4) the most recent study was chosen if studies had overlapping patients or controls. Meeting abstracts, unpublished reports, and review articles were not considered. Finally, nine articles were eligible, including 2641 cases and 3259 controls for Asp312Asn and 3255 cases and 3654 controls for Lys751Gln.
To improve the reliability of data, information was extracted from all eligible publications by two investigators independently according to the following characteristics : f0 irst author's name, year of publication, distribution area, ethnicity, source of controls and number of genotyped patients and controls. The frequencies of the Asn allele for XPD codon 312 and Gln allele for XPD codon 751 were calculated for patients and controls from the corresponding genotype distributions. When articles included subjects of more than one ethnicity, data was extracted separately for future subgroup analysis.
The risks of PCa associated with the XPD Asp312Asn and Lys751Gln were estimated by odds ratios (ORs), with the corresponding 95% CIs. Pearson's goodness-of-fit χ2 test with 1° of freedom was used in the control groups of each study to check the frequencies of genotypes.  For XPD Asp312Asn polymorphisms, we estimated the effect of variant homozygote (Asn/Asn or AA) and heterozygote (Asp/Asn or GA) compared with the wild-type homozygote (Asp/Asp or GG). Moreover, the pooled ORs were performed for dominant model (AA/GA vs. GG) and recessive model (AA vs. GA/GG), respectively. For the Lys751Gln polymorphisms, similar estimations were done : t0 he variant homozygote (Gln/Gln or CC) versus the wild-type homozygote (Lys/Lys or AA), the heterozygote (Lys/Gln or AC) versus the wild-type homozygote (Lys/Lys or AA), the dominant model (CC/AC vs. AA) and the recessive model (CC vs. CC + CA). The χ2 -based Q statistic test was used for the assessment of heterogeneity, and it was considered significant for P < 0.10. Fixed-effects model and the random-effects model based on the Mantel-Haenszel method and the DerSimonian and Laird method were respectively used to combine values from a single study.  When the effects were assumed to be homogenous, the fixed-effects model was used; otherwise, the random-effects model was more appropriate. Publication bias was diagnosed graphically by using funnel plots and assessed statistically using the Egger's test (P < 0.05 was considered representative of statistically significant publication bias).  In addition to the comparisons of all the subjects, subgroup analyses were performed by ethnicity. All the statistical tests were performed with STATA version 11.0 (Stata Corporation, College Station, TX, USA). All P values are two-sided.
| > Results|| |
Characteristics of eligible studies
Nine articles were finally included in the meta-analysis. The races of all the subjects included Caucasians, Asians and Africans. In the study of Rybicki et al., the genotyping distributions of Caucasians, Asians and Africans were not given, so it was considered as the mixed population in subgroup analyses by ethnicity. Furthermore, another study by Agalliu et al., provided the genotyping distributions in both Caucasians and Africans, and thus it was divided into two studies in subgroup analysis by ethnicity.  For XPD Asp312Asn, seven studies from six eligible articles including 2641 cases and 3259 controls explored the association of this SNP with PCa risk. ,,,,, For XPD Lys751Gln, nine studies from eight articles with 3255 cases and 3654 controls were included in the analysis [Table 1]. ,,,,,,,
|Table 1: Characteristics of case-control studies included for xeroderma pigmentosum group D Asp312Asn and xeroderma pigmentosum group D Lys751Gln|
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[Table 2] lists the main results of the meta-analysis for XPD Asp312Asn, and PCa risk. Overall, no significant association was found between this genetic polymorphism and PCa risk. However, when evaluating the effects of the Asp312Asn polymorphism on PCa risk among subgroups by ethnicity, a significantly increased risk was observed in both Asians (Asn/Asn vs. Asp/Asp: odds ratio (OR) = 2.09, 95% confidence interval (CI) = 1.39 3.15, P = 0.38 for heterogeneity test; dominant model: OR = 1.49, 95% CI = 1.12 - 1.98, P = 0.19 for heterogeneity test; recessive model: OR = 1.93, 95% CI = 1.31 - 2.84, P = 0.13 for heterogeneity test) and Africans (Asn/Asn vs. Asp/Asp: OR = 2.80, 95% CI = 1.01, 7.74, P = 0.63 for heterogeneity test), but a decreased risk for Caucasians (Asn/Asn vs. Asp/Asp: OR = 0.71, 95% CI = 0.55 - 0.92, P = 0.62 for heterogeneity test; recessive model: OR = 0.69, 95% CI = 0.54 - 0.88, P = 0.58 for heterogeneity test).
|Table 2: Summary odds ratios and 95% confidence intervals of xeroderma pigmentosum group D Asp312Asn polymorphism and prostate cancer risk|
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[Figure 1] shows the main results of the meta-analysis of XPD Lys751Gln and prostate cancer. However, no significant association was found between this genetic polymorphism and PCa risk in either overall and subgroup analysis.
|Figure 1: Summary odd ratios and 95% confidence interval of xeroderma pigmentosum group D Lys751Gln polymorphism and prostate cancer risk in Gln/Gln versus Lys/Lys model.|
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Substantial heterogeneity was found among different studies for XPD Asp312Asn (Asn/Asn versus Asp/Asp: χ2 = 27.14, df = 5, P < 0.001 and I2 = 81.6% for heterogeneity test) but not among the studies for XPD Lys751Gln (Gln/Gln versus Lys/Lys: χ2 = 5.73, df = 7, P = 0.57 and I2 = 0.0% for heterogeneity test). Therefore, we only assessed the source of heterogeneity for Asn/Asn genotype (Asn/Asn versus Asp/Asp) by ethnicity (P < 0.001). However, the results showed that the observed heterogeneity was not mainly induced by the difference of ethnicity, which only explained 4.58% of the heterogeneity between studies.
Additionally, two , of the studies was not consistent with Hardy-Weinberg equilibrium (HWE P value < 0.05), so we evaluated the results when excluding these two studies. The overall result showed that the results for Asn/Asn versus Asp/Asp model had no significant change after the exclusion (Total: OR = 1.42, 95% CI = 0.61 - 3.35; P < 0.001 for heterogeneity test; Caucasian: OR = 0.71, 95% CI=0.55 - 0.92; P = 0.62 for heterogeneity test; African: OR = 2.80, 95% CI=1.01 - 7.74, P = 0.64 for heterogeneity test).
Publication bias of literatures was assessed by Begg's funnel plot and Egger's test. The shape of the funnel plots of the two SNPs did not reveal any evidence of asymmetry [Figure 2] and [Figure 3]. Egger's test was further used to provide statistical evidence for the funnel plot symmetry.  We observed that publication biases might not have had a significant influence on the results of the XPD Asp312Asn genotype (t = 2.24, P = 0.09) and the XPD Lys751Gln genotype (t = 1.79, P = 0.12).
|Figure 2: Begg's test for odds ratios of Asp/Asp genotype compared with Asn/Asn genotype for xeroderma pigmentosum group D codon 312 in overall studies|
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|Figure 3: Begg's test for odds ratios of Lys/Lys genotype compared with Gln/Gln genotype for xeroderma pigmentosum group D codon 751 in overall studies|
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| > Discussion|| |
In this meta-analysis, we pooled seven eligible studies from six literatures, including 2641 cases and 3259 controls for Asp312Asn and nine eligible studies from eight literatures, including 3255 cases and 3654 controls for Lys751Gln to investigate the associations between polymorphisms of XPD and prostate cancer risk. When stratified by ethnicity, significantly increased risk of 312Asp allele of XPD Asp312Asn was found among Asians and Africans while it seemed to a protective factor in Caucasians.
The XPD gene is mapped to chromosome 19q13.3, and spans over 20 kb, containing 23 exons and encoding a 761-amino acid protein.  The XPD protein is a kind of DNA helicase involved in transcriptions and NER.  Studies have showed that two potentially functional polymorphisms of XPD (Asp → Asn at position of 312 and Lys → Gln at position 751) may result in complete changes of the configuration of the amino acid and thus affect interactions of XPD protein and its helicase activator.  Furthermore, these two polymorphisms had been widely investigated and reported the association with various cancers. There were also several studies conducted to examine the association between these two SNPs and the susceptibility to prostate cancer, but the results remain controversial rather than consistent. ,,,,,,,, Meta-analysis have shown that these two SNPs are associated with the risk of lung cancer, esophageal cancer and bladder cancer but have no association with breast cancer, colorectal cancer, et al. ,,,,, However, no explicit results of meta-analysis of the two SNPs and prostate cancer risk existed. So in this study, we performed a meta-analysis by pooling nine articles and indicated that XPD Asp312Asn may play the different role in the PCa risk in different populations. For example, XPD Asp312Asn polymorphism seemed to increase PCa risk in both Asians and African subjects but decrease the risk in Caucasians. Additionally, the heterogeneity test also indicated a significant heterogeneity in different ethnic groups. The possible reasons may be the difference in genetic background or the environment they lived in. However, because there were only seven studies included in our meta-analysis, results still need the validation from other larger studies. For XPD Lys751Gln polymorphism, it still showed that no significant association was observed between this SNP and PCa risk, suggesting that this SNP might not be associated with the risk of PCa risk.
Our meta-analyses also had some limitations. First, relatively small samples were included for the assessment, partly due to the limited original articles and limited English publications. Second, the controls were not uniformly defined. For example, one study  used healthy population as the reference group; three studies ,, selected hospital patients without organic prostate cancer, and another study  recruited controls from the brothers of cases. Furthermore, the other two studies did not provide the explicit source of controls. Third, no test for gene-environment interactions was done in the analysis due to the lack of sufficient information. Thus, larger and well-designed studies are essential to further evaluate the association between these two SNPs and PCa risk.
| > Acknowledgement|| |
This work was supported by a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2]
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