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A systematic review and meta-analyses of the relationship between glutathione S-transferase gene polymorphisms and renal cell carcinoma susceptibility

Abstract

Background

Association of GSTM1- and GSTT1-null genotypes, GSTP1 A/G gene polymorphism with renal cell carcinoma (RCC) susceptibility was detected, and the relationship between the GSTM1/GSTT1-null genotype and clinical TNM stages of RCC was assessed, using meta-analysis method.

Methods

Association investigations according to eligibility criteria were searched and identified from the databases of Cochrane Library, PubMed, and Embase from establishment time of databases to July 1, 2017, and eligible reports were analyzed by meta-analysis. 95% confidence intervals (CI) were also detected, and odds ratios (OR) was used to express the results for dichotomous data.

Results

This meta-analysis indicated that there was no an association between GSTM1-null genotype, GSTT1-null genotype, GSTP1 A/G gene polymorphism and RCC risk in the overall population of Caucasians or Asians. The dual GSTM1–GSTT1-null genotype was also not associated with RCC in the overall population of Caucasians. Interestingly, there was an association between the dual GSTM1-GSTT1-null genotype and the susceptibility of RCC in Asians. Relationship of the GSTM1-null genotype with clinical TNM stage of RCC was not observed in the overall population of Asians or Caucasians. In this meta-analysis, no association between the GSTT1-null genotype and clinical TNM stage of RCC was observed in Caucasians or Asians. Interestingly, GSTT1-null genotype was detected to be associated with the clinical TNM stages in patients with RCC in the overall population.

Conclusion

The dual GSTM1-GSTT1-null genotype is detected to be associated with the onset of RCC in Asians, and there is an association between the GSTT1-null genotype and the clinical TNM stages in patients with RCC in the overall population.

Peer Review reports

Background

Renal cell carcinoma (RCC) is associated with high mortality, accounts for approximately 80–85% of all renal tumors, and is the most common type of adult kidney cancer with poor prognosis [1]. Approximately 30% RCC patients already have metastatic lesions upon initial diagnosis [2]. Renal cell carcinoma (RCC) is highly resistant to both chemotherapy and radiotherapy [3]. Early diagnosis of patients with RCC would significantly improve their prognosis and quality of life [4,5,6]. The incidence of survival is very low, since most RCC patients have developed metastases beyond the kidney tissue when the RCC is diagnosed [4, 7, 8]. Early diagnosis for the disease of RCC is very difficult, and the RCC etiology is complicated [4, 8]. Gene polymorphisms are reported to be associated with susceptibility of many diseases [9,10,11,12,13]. Current evidence also shows some gene polymorphisms to be associated with RCC risk [14,15,16,17].

The glutathione S-transferases (GSTs) is a family of isozymes including GSTM1, GSTT1, and GSTP1 classes, and can catalyze the glutathione to detoxify xenobiotics [18, 19]. GSTs conjugate glutathione (GSH), a scavenger peptide, with electrophilic compounds [20, 21], and are known to play a pivotal role in the detoxification of some potential carcinogens [22, 23]. It has also been suggested that certain GST gene polymorphisms, leading to altered detoxification activity, predispose individuals to certain cancers, such as prostate cancer, hepatocellular carcinoma, and colorectal cancer [24,25,26].

Previously, most epidemiologic investigations have detected a relationship between the GSTM1/GSTT-null phenotype, the GSTP1 A/G gene polymorphism, and RCC risk. But, the current evidence is inadequate, for the reason that sparseness of data or inconsistencies among these reported investigations. This meta-analysis was conducted to assess whether the null genotype of GSTM1/GSTT1 and the GSTP1 A/G gene polymorphism are associated with RCC susceptibility by ethnicity, and whether there is an association between the null genotype of GSTM1/GSTT1 and clinical TNM stages in patients with RCC by ethnicity, due to the fact that the genotype distributions of the different populations might differ from each other [27, 28]. We also evaluated the publication bias for the relationship between the GSTM1-null genotype, GSTT1-null genotype, dual GSTM1/GSTT1-null genotype, and GSTP1 A/G gene polymorphism and RCC risk for the overall population.

Methods

Search strategy

Retrieval of relevant published articles were conducted in the electronic databases of Cochrane Library, PubMed, and Embase from establishment time of databases to July 1, 2017, and eligible investigations were recruited for our meta-analysis. Key subjects for retrieval consisted of (“glutathione S-transferases” OR “GSTs” OR “GSTM1” OR “GSTT1” OR “GSTP1”) and (“renal cell carcinoma” OR “renal cancer” OR “RCC”). Additional reports were also recruited through references which were cited in the included investigations, and references of retrieved articles from previous meta-analyses were also inspected.

Inclusion criteria and exclusion criteria

Inclusion criteria

(1) prospective study, case-control study, and cross-sectional study; (2) there should be two comparison groups (RCC vs. control); (3) the endpoint had to be RCC; (4) the study should provide detailed data for the genotype distribution.

Exclusion criteria

(1) primary results were not on GSTM1, GSTT1, GSTP1 or outcome; (2) review articles, case reports and editorials; (3) investigated the effect of GST gene expression on disease.

Quality appraisal

In order to evaluate the quality of the recruited investigations that met the inclusive criteria mentioned above, a quality score criteria based on seven aspects of a genetic association investigations was used (Additional file 1: Table S1). The quality score form was instituted by Thakkinstian et al. in 2005 [29]. Its range of this form spanned from zero (the worst quality) to 12 (the best quality). Investigations were categorized to be “high quality” when the quality score was more than seven; otherwise, studies were regarded as “low quality”. Quality appraisal was implemented by two researchers who were independently responsible for the literature retrieval, and discussions were held until every aspect was entirely consistent by comparison.

Data extraction and data synthesis

The following information from each eligible study was excerpted by two investigators independently: the surname of first author, publication year and the sample size of RCC cases and controls for GSTM1, GSTT1, and GSTP1 genotypes. Frequencies of genotypes for GSTM1, GSTT1 and GSTP1 were calculated for each case group and control group. The results were compared, and discussion was performed when there was disagreement. Consistency of data extracted by the two researchers was tested and any disagreement was resolved through discussion.

Statistical analysis

All statistical analyses were performed using Cochrane Review Manager Version 5.3 (Cochrane Library, UK). Fixed-effect model (Mantel-Haenszel method) was used to estimate the pooled statistic. The heterogeneity among the included studies was detected using I2. On the other hand, when the P-value from the heterogeneity test was less than 0.1, a random effects model (DerSimonian-Laird method) was conducted. Odds ratios (OR) were used for results of dichotomous data, and 95% confidence intervals (CI) were also counted. A P < 0.05 was regarded as statistical significance for the pooled OR. Publication bias was graphically judged from the Begg adjusted rank correlation test [30] and the Egger regression asymmetry test [31], when the number of the included studies was more than six.

Results

Study characteristics

Fifteen investigations [32,33,34,35,36,37,38,39,40,41,42,43,44,45,46] were recruited into our meta-analysis to assess the association between the GSTM1-null genotype and the susceptibility of RCC (Fig. 1 and Table 1). Data was extracted by the sequences of the surname of first author, publication year and the sample size of RCC cases and controls for the GSTM1 genotype (Table 1). The 15 included reports contained 3782 cases and 5223 controls. The average GSTM1-null genotype distribution frequency in controls was 49.83%, and the average genotype distribution frequency of the GSTM1-null genotype in patients with RCC was 48.63%, indicating the average GSTM1-null genotype distribution frequency in RCC patients was similar to that in the control group (control/RCC = 1.02), suggesting that the GSTM1-null genotype was unrelated to RCC.

Fig. 1
figure 1

Flow chart of the study search and selection

Table 1 Characteristics of studies evaluating the effects of GSTM1 and GSTT1 null genotypes on RCC risk

Fifteen studies [32,33,34,35,36,37,38,39,40,41,42,43,44,45,46] were recruited into our meta-analysis to detect the association of the GSTT1-null genotype with RCC susceptibility (Fig. 1 and Table 1). Those 15 investigations contained 3735 cases and 5179 controls. The average GSTT1-null genotype distribution frequency in controls was 23.02%and the average GSTT1-null genotype distribution frequency in RCC cases was 24.62%. Therefore, the average distribution frequency of the GSTT1-null genotype in control group was similar to that in cases (control/RCC = 0.94), suggesting that the GSTT1-null genotype was also unrelated to RCC.

Nine studies [32, 34, 36, 38, 41,42,43,44,45] were recruited into our meta-analysis to assess the relationship of the dual-null genotype, of individuals lacking both GSTM1 and GSTT1, and the susceptibility of RCC (Fig. 1 and Table 1). The nine investigations contained 2679 cases and 3589 controls. The average GSTM1–GSTT1 dual-null genotype distribution frequency in cases with RCC was 23.71% compared to the average frequency of 20.66% in the controls. The average dual-null genotype of GSTM1–GSTT1 distribution frequency in RCC patients was slightly increased when compared with that in control group (RCC/control = 1.15).

Eight studies [33, 34, 36, 37, 41, 44, 46, 47] were included in our study to detect the association of the null genotype of GSTP1 with the susceptibility of RCC (Fig. 1 and Table 2). These 8 investigations contained 2197 cases and 3323 controls. The average A allele distribution frequency in controls was 70.44%, and the average A allele distribution frequency in RCC cases was 69.11%. The average A allele distribution frequency of GSTP1 in control group was similar when compared with that in the RCC group (control/RCC = 1.02), suggesting a lack of association of the GSTP1 A allele with RCC.

Table 2 Characteristics of studies evaluating the effects of GSTP1 gene polymorphism on RCC risk

Four studies [34, 40, 41, 45] were included in our meta-analysis to detect the relationship of GSTM1 with clinical TNM stage of RCC (Fig. 1 and Table 3). Those four investigations contained 501 cases and 423 controls. The average GSTM1-null genotype distribution frequency in stage I + II was 47.33%, and the average GSTM1-null genotype distribution frequency in stage III + IV was 55.76%. The average GSTM1-null genotype distribution frequency in stage I + II was slightly reduced than that in stage III + IV (I + II/III + IV = 0.85).

Table 3 Characteristics of studies evaluating the effects of GSTM1 and GSTT1 null genotypes on clinical TNM stages of RCC

Five studies [34, 40,41,42, 45] were recruited into this meta-analysis to assess the association between GSTT1 and clinical TNM stages of RCC (Fig. 1 and Table 3). Those five studies contained 570 cases and 434 controls. The average GSTT1-null genotype distribution frequency in stage I + II was 37.15%, compared to the average frequency of 49.1% in stage III + IV patients. The average GSTT1-null genotype distribution frequency in stage I + II was notably reduced than the average GSTT1-null genotype distribution frequency in stage III + IV (I + II/III + IV = 0.76).

Relationship between the GSTM1-null genotype and the susceptibility of RCC

The GSTM1-null genotype was found to be not associated with RCC susceptibility in the collective populations, Asians and Caucasians, hospital-based controls, or population-based controls (collective populations: OR = 1.00, 95% CI: 0.92–1.09, P = 0.91; Caucasians: OR = 1.02, 95% CI: 0.92–1.12, P = 0.72; Asians: OR = 0.95, 95% CI: 0.78–1.17, P = 0.65; hospital-based controls: OR = 1.01, 95% CI: 0.92–1.11, P = 0.85; population-based controls: OR = 0.87, 95% CI: 0.57–1.33, P = 0.52; Fig. 2 for the overall population; Table 4). When only the high-quality investigations were recruited for meta-analysis, this association was also not found (OR = 1.02, 95% CI: 0.93–1.11, P = 0.72; Table 4).

Fig. 2
figure 2

Association between GSTM1 null genotype and RCC susceptibility in the overall population. CI: confidence interval

Table 4 Meta-analysis of the association of GSTM1- and GSTT1-null genotypes and GSTP1 with RCC risk and the relationship between GSTM1, GSTT1 and clinical TNM stages of RCC

Relationship between the GSTT1-null genotype and the susceptibility of RCC

Association of GSTT1 null genotype with RCC risk was not found in the overall population, Caucasians and Asians, hospital-based controls, population-based controls (overall population: OR = 1.09, 95% CI: 0.90–1.33, P = 0.38; Caucasians: OR = 1.00, 95% CI: 0.88–1.13, P = 0.97; Asians: OR = 1.73, 95% CI: 0.95–3.28, P = 0.09; hospital-based controls: OR = 1.01, 95% CI: 0.90–1.14, P = 0.84; population-based controls: OR = 1.62, 95% CI: 0.90–2.91, P = 0.11; Fig. 3 for the overall population; Table 4). When only the high-quality investigations were included for meta-analysis, an association was also not found (OR = 1.09, 95% CI: 0.90–1.32, P = 0.39; Table 4).

Fig. 3
figure 3

Association between the GSTT1-null genotype and RCC susceptibility in the overall population. CI: confidence interval

Association of the dual GSTM1–GSTT1-null genotype with the susceptibility of RCC

There was no an association between the dual-null genotype of individuals lacking both GSTM1– and GSTT1 and RCC risk in the overall population, Caucasians, or hospital-based controls (overall population: OR = 1.26, 95% CI: 1.00–1.59, P = 0.05; Caucasians: OR = 1.05, 95% CI: 0.89–1.23, P = 0.58; hospital-based controls: OR = 1.07, 95% CI: 0.91–1.25, P = 0.43; Fig. 4 for the overall population; Table 4). When only the high-quality studies were recruited for meta-analysis, this association was also not found (OR = 1.17, 95% CI: 1.01–1.36, P = 0.03; Table 4). However, stratification into Caucasians and Asians revealed that the dual GSTM1-GSTT1-null genotype was associated with the onset of RCC in Asians, when compared to population-based controls (Asians: OR = 1.72, 95% CI: 1.24–2.38, P = 0.001; population-based controls: OR = 1.70, 95% CI: 1.25–2.32, P = 0.0007; Table 4).

Fig. 4
figure 4

Association between dual-null genotype of GSTM1–GSTT1 with RCC risk in the overall population. CI: confidence interval

Association between the GSTP1 a/G gene polymorphism and RCC susceptibility

The GSTP1 A/G gene polymorphism was not associated with RCC risk in the overall population, Asians and Caucasians, hospital-based controls, or population-based controls (overall population: A allele: OR = 0.93, 95% CI: 0.77–1.11, P = 0.41; AA genotype: OR = 0.74, 95% CI: 0.55–1.00, P = 0.05; GG genotype: OR = 1.14, 95% CI: 0.93–1.14, P = 0.22; Table 4). When only the high-quality studies were recruited for the meta-analysis, this relationship was also not found (A allele: OR = 0.93, 95% CI: 0.77–1.11, P = 0.41; AA genotype: OR = 0.74, 95% CI: 0.55–1.00, P = 0.05; GG genotype: OR = 1.14, 95% CI: 0.93–1.14, P = 0.22; Table 4).

Relationship between the GSTM1-null genotype and clinical TNM stages of RCC

GSTM1-null genotype was not associated with the clinical TNM stages of RCC in the overall population, Caucasians, Asians, or hospital-based controls (overall population: OR = 0.72, 95% CI: 0.30–1.70, P = 0.45; Caucasians: OR = 1.68, 95% CI: 0.88–3.24, P = 0.12; Asians: OR = 0.55, 95% CI: 0.11–2.70, P = 0.46; hospital-based controls: OR = 1.32, 95% CI: 0.95–1.83, P = 0.10; Table 4). When only the high-quality studies were recruited for meta-analysis, this association was also not found (OR = 0.72, 95% CI: 0.30–1.70, P = 0.45; Table 4). Interestingly, the GSTM1-null genotype was associated with the clinical TNM stages of RCC when the meta-analysis was compared to population-based controls (OR = 0.30, 95% CI: 0.18–0.51, P<0.0001; Table 4).

Association of the GSTT1-null genotype with clinical TNM stages in patients with RCC

The GSTT1-null genotype was not associated with clinical TNM stage of RCC in Caucasians or Asians vs. population-based controls (Caucasians: OR = 0.56, 95% CI: 0.31–1.01, P = 0.06; Asians: OR = 0.48, 95% CI: 0.21–1.12, P = 0.09; population-based controls: OR = 0.54, 95% CI: 0.16–1.87, P = 0.33; Table 4). When only high-quality studies were included for the meta-analysis, association of the GSTT1-null genotype with clinical TNM stage of RCC was found (OR = 0.59, 95% CI: 0.41–0.85, P = 0.004; Table 4). Interestingly, the GSTT1-null genotype was found to be associated with the clinical TNM stages in patients with RCC in the overall population, and when the meta-analysis included hospital-based controls (overall populations: OR = 0.56, 95% CI: 0.41–0.78, P = 0.0006; hospital-based controls: OR = 0.64, 95% CI: 0.42–0.97, P = 0.03; Table 4).

Evaluation of publication bias

A publication bias test was performed for the association of the GSTM1-null genotype, GSTT1-null genotype, GSTM1-null/GSTT1-null genotype, and GSTP1 A/G gene polymorphism with RCC risk, when compared to the overall population. No publication biases for the relationship between the GSTM1-null genotype or GSTT1-null genotype and RCC risk was determined in the overall population (GSTM1: Begg P = 0.692, Egger P = 0.400; GSTT1: Begg P = 0.166, Egger P = 0.095; GSTM1-null/GSTT1-null genotype: Begg P = 0.917, Egger P = 0.628; GSTP1 A/G gene polymorphism: Begg P = 0.902, Egger P = 0.290; Fig. 5).

Fig. 5
figure 5

Publication bias A: GSTM1-null genotype; B: GSTT1-null genotype; C: dual null genotype for GSTM1/GSTT1; D: GSTP1 A/G gene polymorphism. Each point represents a separate study for the indicated association. Log or represents natural logarithm of OR. Vertical line represents the mean effects size

Discussion

In this study, we found that the average GSTM1-null genotype distribution frequency in patients with RCC is similar with the average GSTM1-null genotype distribution frequency in the control group, indicating that the GSTM1-null genotype is not associated with RCC susceptibility. We performed the meta-analysis in further depth, and still found that there is no an association between null genotype for GSTM1 and RCC risk in the overall population of Caucasians and Asians, hospital-based controls, population-based controls, high-quality studies. Publication bias was also tested and not found for GSTM1. Our results indicate that the GSTM1-null genotype does not predict the susceptibility of RCC. The sample size in our meta-analysis was larger than other meta-analyses [43, 48,49,50,51].

The average GSTT1-null genotype distribution frequency in patients with RCC was also similar to the average GSTT1-null genotype distribution frequency in the control group, indicating that the null genotype for GSTM1 is also not associated with RCC susceptibility. For confirmation, a meta-analysis was performed and showed that there was no an association between null genotype of GSTM1 and the RCC susceptibility in the overall population, Caucasians and Asians, hospital-based controls, population-based controls. When only the high-quality studies were recruited for meta-analysis, this association was also not found. Publication bias was also tested and not found for GSTT1. Our results indicate that the GSTT1-null genotype does not predict the RCC susceptibility. The sample size in our meta-analysis was larger than other meta-analyses [43, 48,49,50].

The average GSTM1-null/GSTT1-null genotype distribution frequency in patients with RCC is slightly increased. This could indicate that the dual-null genotype, of individuals lacking both GSTM1 and GSTT1, might be associated with the susceptibility of RCC. However, further meta-analysis to detect the risk of the GSTM1-null/GSTT1-null genotype for RCC susceptibility showed no association between the GSTM1-null/GSTT1-null genotype and RCC susceptibility in the overall population of Caucasians, compared to hospital-based controls, when only high-quality studies were recruited in the meta-analysis. However, the dual-null genotype was associated with the onset of RCC in Asians, when compared to population-based controls. There was no publication bias for this meta-analysis. As above, the sample size in our meta-analysis was larger than other meta-analyses [48, 50].

The association of the GSTP1 A/G gene polymorphism with the susceptibility of RCC was also characterized. The average A allele distribution frequency of GSTP1 in patients with RCC was similar when compared with that in control group, suggesting that there was no association of the GSTP1 A/G gene polymorphism with RCC susceptibility. We also conducted a meta-analysis and confirmed that the GSTP1 A/G gene polymorphism is not associated with RCC risk in the overall population of Caucasians and Asians examined, and regardless of whether controls were hospital-based or population-based, and whether high quality studies were solely used. No publication bias was found in this meta-analysis. Furthermore, the sample size in this meta-analysis was notable larger than other meta-analyses [43, 49].

We have also assessed the relationship between GSTM1 and clinical TNM stages in patients with RCC. The average GSTM1-null genotype distribution frequency in stage I + II is slightly lower when compared with that in stage III + IV RCC (I + II/III + IV = 0.85). This might indicate that the GSTM1-null genotype is associated with RCC TNM stage. However, meta-analysis of the high-quality studies indicates no association of GSTM1-null genotype with clinical TNM stages of RCC is present in the overall population of Caucasians and Asians, compared to hospital-based controls. Interestingly, the GSTM1-null genotype is associated with the clinical TNM stages of RCC when the meta-analysis included controls from the population. The sample size of our meta-analysis is notable larger than other meta-analyses [29]. However, more studies are required for confirmation.

The relationship between GSTT1 and clinical TNM stages of RCC is also assessed. The average GSTT1-null genotype distribution frequency in stage I + II is notably lower when compared with that in stage III + IV RCC (I + II/III + IV = 0.76). This might indicate a lack of association of the GSTT1-null genotype with clinical TNM stages of RCC in Caucasians and Asians, when compared to population-based controls (Table 4). When only the high-quality studies were included for meta-analysis, this association was also found (Table 4). Interestingly, the GSTT1-null genotype is found to be associated with the clinical TNM stages in patients with RCC in the overall population when the meta-analysis includes hospital-based controls. The GSTT1-null genotype is also found to be associated with the clinical TNM stages in patients with RCC in the overall population, when compared to hospital-based controls, and in the meta-analysis including high quality studies. Again, the sample size of our meta-analysis is larger than a previous meta-analysis [49]. However, more studies should be performed.

Cheng et al. [50] conducted a meta-analysis that included six investigations for GSTM1, six reports for GSTT1, and four studies for the dual-null genotype for GSTM1 and GSTT1, and reported that no association was found between the GSTM1-null/GSTT1-null genotype and RCC susceptibility. The authors also performed a GSTM1-GSTT1 interaction analysis and indicated that the dual GSTM1/GSTT1-null genotype was not significantly associated with the susceptibility of RCC. Liu et al. [51] performed a meta-analysis on eight studies and showed that the GSTM1-null genotype was not significantly associated with susceptibility of RCC. Yang et al. [49] conducted a meta-analysis recruited 10 studies of GSTM1, 10 reports of GSTT1, and five studies of GSTP1, and reported that GSTM1, GSTT1 and GSTP1 gene polymorphisms were not associated with the development of the RCC disease. Jia et al. [43] performed a meta-analysis on 10 studies of GSTM1, 10 reports of GSTT1, five studies of dual GSTM1-GSTT1-null genotype, six studies of GSTP1, and concluded that GSTM1, GSTT1, and GSTP1 gene polymorphisms were not to be associated with the risk of RCC. Also, GSTM1-GSTT1 interaction analysis indicated that the dual null genotype for GSTM1/GSTT1 was notably associated with an increased RCC susceptibility. Huang et al. [48] analyzed eight studies of GSTM1, eight studies of GSTT1, three studies of GSTM1 gene polymorphism and clinical TNM stages, and four studies on GSTM1 and GSTT1 gene polymorphism and clinical TNM stages, and indicated that GSTM1 and GSTT1 gene polymorphisms were not markedly associated with RCC susceptibility in a recessive model. However, comparison of the wild-type genotype versus the dual GSTM1-GSTT1-null genotype showed a positive association with the susceptibility of RCC. The authors also identified an association of wild-type GSTT1 with low RCC TNM stages. A strong association between GST genotypes and polymorphism and risk of renal cancer is not there in the total population. The conclusion of all these studies is that GST genotypes and polymorphisms cannot be used as biomarkers for early diagnosis.

In this meta-analysis, there are some limitations. First, there was heterogeneity among the recruited studies for the reason that the patients and controls were from different races, and the controls were population-based or hospital-based. Second, geographic origin might affect the relationship between GSTs gene polymorphism and RCC susceptibility, and we did not conduct a sub-group analysis. Furthermore, the quality of the recruited articles was different. These factors might prevent us from drawing a more robust conclusion. In addition, although our sample size is larger than prior meta-analyses, but more original studies continue to be needed to draw a more robust conclusion. More well-designed investigations should be conducted in the future.

Conclusion

The results in this study support that there is an association of the dual GSTM1-GSTT1-null genotype with RCC susceptibility in Asians, and there is an association between the GSTT1-null genotype and clinical TNM stage of RCC in the overall population. However, more association studies are required to be conducted to further clarify these relationships.

Abbreviations

GSH:

Glutathione

GST:

Glutathione S-transferase

RCC:

Renal cell carcinoma

TNM:

Tumor node metastasis

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Funding

This study was supported by Guangzhou Medical Key Discipline Construction Project.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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TZ was in charge of conceived and designed the study. ZQZ, HYL and HZZ were responsible for collection of data and performing the statistical analysis and manuscript preparation. WJX and ZJL were responsible for checking the data. All authors were responsible for drafting the manuscript, read and approved the final version.

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Correspondence to Tianbiao Zhou.

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Table S1. Scale for Quality Assessment. (DOC 44 kb)

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Zhong, Z., Li, H., Zhong, H. et al. A systematic review and meta-analyses of the relationship between glutathione S-transferase gene polymorphisms and renal cell carcinoma susceptibility. BMC Med Genet 19, 98 (2018). https://doi.org/10.1186/s12881-018-0620-y

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