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| ORIGINAL ARTICLE |
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| Year : 2016 | Volume
: 12
| Issue : 8 | Page : 264-267 |
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X-ray cross-complementing groups 1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility: A meta-analysis based on Chinese Han population
Liming Wang, Junfeng Qian, Chunxiao Ying, Yongwei Zhuang, Xingjie Shang, Fang Xu
Department of Gastroenterology, The People's Hospital of Lishui, The Sixth Affiliated Hospital of Wenzhou Medical University, Lishui 323000, Zhejiang, China
| Date of Web Publication | 22-Feb-2017 |
Correspondence Address:
Fang Xu
Department of Gastroenterology, The People's Hospital of Lishui, The Sixth Affiliated Hospital of Wenzhou Medical University, Lishui 323000, Zhejiang
China
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0973-1482.200753
Objective: X-ray cross-complementing groups 1 (XRCC1) rs1799782 C>T polymorphisms and colorectal cancer susceptibility were not clear. The purpose of this study was to evaluate the association between XRCC1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility by meta-analysis.
Materials and Methods: Related databases of Medline, CNKI, and Wanfang were systematic searched for the studies related to XRCC1 rs1799782 C>T polymorphisms and colorectal cancer risk in Chinese Han population. The genotype distribution of CC, CT and TT were extracted from each included studies in the colorectal cancer patients and healthy control subjects. The odds ratio (OR) and its 95% confidence interval (95% CI) was used to assess the correlation between genetype and colorectal cancer risk. The publications for this study was evaluated by Begg's funnel plot and Egger's line regression test.
Results: The median frequency of CC, CT, and TT genotype in cancer group were 48%, 41% and 11%; For control group, they were 51%, 40% and 8%; the pooled results showed that OR = 1.32 (95% CI: 1.041–1.67, P < 0.05). The pooled results indicated that XRCC1 rs1799782 C>T polymorphisms was associated with colorectal cancer susceptibility in recessive genetic model OR = 1.32 (95% CI: 1.041–1.67, P < 0.05), dominant genetic model OR = 1.21 (95% CI: 1.00–1.46, P < 0.05) and homozygous genetic model OR = 1.43 (95% CI: 1.07–1.91, P < 0.05). The funnel plot was significant asymmetric at the bottom and the Egger's test also indicated significant publication bias (t = 2.43, P = 0.04) for recessive genetic model. But, no publication bias was found in dominant and homozygous model (P > 0.05).
Conclusion: Chinese Han people with rs1799782 TT/CT genotype of XRCC1 gene may have increased risk of developing colorectal. Keywords: Colorectal cancer, meta-analysis, polymorphisms, susceptibility, X-ray cross-complementing groups 1 gene
How to cite this article:
Wang L, Qian J, Ying C, Zhuang Y, Shang X, Xu F. X-ray cross-complementing groups 1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility: A meta-analysis based on Chinese Han population. J Can Res Ther 2016;12, Suppl S4:264-7 |
How to cite this URL:
Wang L, Qian J, Ying C, Zhuang Y, Shang X, Xu F. X-ray cross-complementing groups 1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility: A meta-analysis based on Chinese Han population. J Can Res Ther [serial online] 2016 [cited 2021 Mar 7];12:264-7. Available from: https://www.cancerjournal.net/text.asp?2016/12/8/264/200753 |
| > Introduction | |  |
Colorectal cancer is one of the most diagnosed malignant tumors of digestive system. It was estimated about seventy colorectal patients dead each year worldwide.[1] And this number was still on the rise. In China, colorectal cancer is the 4th most happed malignant carcinoma inferior to lung cancer, breast cancer, and stomach cancer.[2] Epidemiology study showed the confirmed risk factors for colorectal cancer were colorectal cancer family history, familial hereditary adenoma, obesity, less activity, and chronic enteritis.[3]
X-ray cross-complementing groups 1 (XRCC-1) in humans is encoded by the XRCC1 gene. XRCC1 is involved in DNA repair where it complexes with DNA ligase III.[4] XRCC1 is involved in the efficient repair of DNA single-strand breaks formed by exposure to ionizing radiation and alkylating agents. Several studies have reported the association between XRCC-1 rs1799782 C>T polymorphisms and colorectal cancer. However, the results were not consistent.
| > Materials and Methods | | |
Publication searching and inclusion
The databases of PubMed/Medline, EMBASE, and CNKI were systematic searched by two reviewers independently to find the potential applicable case–control or cohort publications. The search words were (colorectal cancer or colorectal carcinoma or colon cancer) and (XRCC1) and (polymorphisms or variant). The publication inclusion criteria were: (1) Study type: Case–control or cohort study; (2) patients: The patients included in each study were Chinese Han people diagnosed with colorectal cancer with pathology confirmation; (3) genotyping method: The genotyping method was correct; (4) publication language: The paper was published in English or Chinese.
Data extraction
The following information and data were extracted by two reviewers independently: (1) author of each study; (2) the year of each paper publication; (3) province the study was performed; (4) genotype of CC, CT and TT distribution; (5) genotyping methods; (6) Hardy–Weinberg equilibrium.
Statistical analysis
The statistical analysis was done by STATA/SE 11.0 (Stata Corporation, College Station, TX) software. The statistical heterogeneity was evaluated by Chi-square test. The association between XRCC1 and colorectal cancer susceptibility was demonstrated by odds ratio (OR). The publication bias was evaluated by Begg's funnel plot and Egger's test. Two-tail P < 0.05 was deemed as statistical difference.
| > Results | | |
General characteristics of the included articles
After searching the related databases, we finally included 11 case–control studies in our present meta-analysis. Seven of the included studies published in Chinese and other four published in English. The main characters of the included studies were shown in [Table 1].
Genotype distribution
The median frequency of CC, CT, and TT genotype in case group was 48%, 41%, and 11%; for control group, they were 51%, 40%, and 8%, respectively [Figure 1]. | Figure 1: The genotype distribution of CC, CT, and TT for the case and control groups
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Meta-analysis
Recessive genetic model (TT vs. CC + CT)
Being the significant statistical heterogeneity across the included studies (P < 0.05), the data were pooled by random effects model. The pooled results showed that OR = 1.32 (95% confidence interval [CI]: 1.041–1.67, P < 0.05). The pooled results indicated that XRCC1 rs1799782 C>T polymorphisms was associated with colorectal cancer susceptibility in recessive genetic model [Figure 2]. Publication bias was evaluated by Begg's funnel plot and Egger's line regression test. The funnel plot was significant asymmetric at the bottom, and the Egger's test also indicated significant publication bias (t = 2.43, P = 0.04), [Figure 3]. | Figure 2: Forest plot of X-ray cross-complementing groups 1 rs1799782 C>T polymorphisms and colorectal cancer for recessive model
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Dominant genetic model (TT + CT vs. CC)
With significant statistical heterogeneity across the included studies (P < 0.05), the data were pooled by random effects model for dominant genetic model. The pooled results showed that OR = 1.21 (95% CI: 1.00–1.46, P < 0.05). The pooled results indicated that XRCC1 rs1799782 C>T polymorphisms was associated with colorectal cancer susceptibility in dominant genetic model, [Figure 4]. The funnel plot was significant symmetric at the bottom and the Egger's test did not indicated significant publication bias (t = 0.31, P = 76) [Figure 5]. | Figure 4: Forest plot of X-ray cross-complementing groups 1 rs1799782 C>T polymorphisms and colorectal cancer for dominant genetic model
Click here to view |
Homozygous genetic model (TT vs. CC)
For homozygous model (TT vs. CC), the statistical heterogeneity was significant for the included 11 studies (P = 0.05). The data were pooled by random effects model. The pooled OR = 1.43 (95% CI: 1.07–1.91, P < 0.05) [Figure 6]. The pooled data indicated that people with TT genotype polymorphisms were susceptible to colorectal cancer in homozygous genetic model. And, funnel plot indicated no publication bias [Figure 7]. | Figure 6: Forest plot of X-ray cross-complementing groups 1 rs1799782 C>T polymorphisms and colorectal cancer for homozygous genetic model
Click here to view |
| > Discussion | | |
Recently, more and more studies have showed that the cancer gene or tumor suppressor gene single nucleotide polymorphism had affect the cancer development and progression. XRCC1 gene, in human beings, located on human chromosome 19 long arm region (19q13.2-19q13.2). The protein encoded by XRCC1 play a role in interacts with DNA ligase III, polymerase beta and poly (ADP-ribose) polymerase to participate in the base excision repair pathway. Animal experiment showed deficiency in XRCC1, due to being heterozygous for a mutated XRCC1 gene coding for a truncated XRCC1 protein, suppresses tumor growth in mice. In human beings, several studies showed that XRCC1 rs1799782 C>T polymorphisms was associated with the susceptibility. Li and et al.[4] have discussed the polymorphisms in genes of APE1, PARP1, and XRCC for the risk and prognosis of colorectal cancer in a northeast Chinese population. In their study, the author included 451 colorectal cancer patients and 631 healthy controls. They found XRCC1 194 dominant model (OR = 1.45, 95% CI 1.12–1.88) were associated with increased CRC risk. But Jin et al.[5] had investigated correlations of single nucleotide polymorphisms of DNA repair gene XRCCl to risk of colorectal cancer. They recruited 207 colorectal patients and 621 healthy controls. They found no significant correlation between XRCC1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility. Therefore, the results of Li and Jin were contrary.
We have searched the databases of PubMed and CNKI to find all the open published studies related to XRCC1 rs1799782 C>T polymorphisms and colorectal cancer susceptibility. And the data were pooled by meta-analysis. The pooled results showed XRCC1 rs1799782 C>T polymorphisms was associated with colorectal cancer susceptibility in recessive genetic model OR = 1.32 (95% CI: 1.041–1.67, P < 0.05), dominant genetic model OR = 1.21 (95% CI: 1.00–1.46, P < 0.05) and homozygous genetic model OR = 1.43 (95% CI: 1.07–1.91, P < 0.05). So, Chinese Han people with rs1799782 TT/CT genotype of XRCC1 gene may have increased risk of developing colorectal cancer.
Limitations for this meta-analysis: (1) In this meta-analysis, the publication bias for homozygous genetic model was significant. (2) Significant statistical heterogeneity was found in recessive genetic model, dominant genetic model, and homozygous genetic model. [14]
Financial support and sponsorship
Nil.
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7]
[Table 1]
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