Glutathione S-transferase P1 Ile105Val Polymorphism and Oral Cancer Risk: A Meta-Analysis

Abstract

Objective The glutathione S-transferase P1 (GSTP1) gene has been suggested to play an important role in the pathogenesis of oral cancer. However, the results have been inconsistent. In this study, we performed a meta-analysis to clarify the association of GSTP1 Ile105Val polymorphisms with oral cancer risk.Methods Published literature from PubMed and EMBASE were retrieved. Pooled odds ratio (OR) with 95% confidence interval (CI) was calculated using fixed- or random-effects model.Results 13 studies (1803 oral cancer cases and 2998 controls) for GSTP1 Ile105Val polymorphism were included in the meta-analysis. The results indicated that there was no significant association between GSTP1 Ile105Val polymorphism and oral cancer in the overall population (OR=1.30, 95%CI=0.92-1.38, I2=48.0%, p for heterogeneity=0.027). Further subgroup analysis by ethnicity suggested that GSTP1 Ile105Val polymorphism was significantly associated with oral cancer only in East Asians (OR=1.64, 95%CI=1.16-2.31, I2=0.0%, p for heterogeneity=0.525), but not in Caucasians (OR=1.16, 95%CI=0.73-1.82, I2=7.5%, p for heterogeneity=0.299), Africans (OR=1.10, 95%CI=0.37-3.28), South Asians (OR=1.20, 95%CI=0.69-2.08, I2=74.3%, p for heterogeneity=0.021) and mixed population (OR=0.91, 95%CI=0.70-1.20, I2=39.7%, p for heterogeneity=0.174).Conclusions The present meta-analysis has limited evidence to support the association of GSTP1 Ile105Val polymorphism with HCC risk in the overall population. However, GSTP1 Ile105Val polymorphism might be associated with risk of oral cancer in East Asians.

GTSP1 expression in non-smoker and non-drinker patients with squamous cell carcinoma of the head and neck

“…Second, alternatively, the reduction in the expression of GTSP1 in the mucosa of NSND patients could represent a risk factor for the development of cancer in this subset of patients. The relationship among GTSP1 expression, carcinogenesis and smoking and drinking habits is still unclear [ 8 , 17 , 26 , 27 ], but we believe that our results reinforce the hypothesis that the status of GTSP1 should be analyzed in addition to the information regarding smoking and drinking habits in patients. Analysis of the genetic polymorphisms and enzymatic function of GTSP1 in these patients as well as in healthy subjects may clarify our findings.…”

Polymorphisms in alcohol and tobacco metabolism genes in head and neck cancer in the Basque Country

“…In this study, we have observed that homozygous carriers of the Val allele, which would induce the accumulation of a number of genotoxic compounds, displayed a higher risk for HNSCC (OR = 4.12, 95%CI 1.11–15.31). This association between the GSTP1 Ile105Val polymorphism and HNSCC risk has been previously observed in East Asians; however, it is still controversial in other populations .…”

Decreased expression of glutathione S‐transferase pi correlates with poorly differentiated grade in patients with oral squamous cell carcinoma

“…The polymorphism of GSTP1, such as at codon 105 of GSTP1 gene, which alters its catalytic activity, has also been investigated to study its association with pathogenesis of several cancers; unfortunately, there is no significant association between GSTP1 IIe105Val polymorphism and oral cancer in the overall population . It is supposed that gene‐gene/gene‐environment interactions might concert with GSTP1 to generate genomic instability and to initiate the neoplastic process.…”