Does occupational exposure to solvents and pesticides in association with glutathione S-transferase A1, M1, P1, and T1 polymorphisms increase the risk of bladder cancer? The Belgrade case-control study

PLoS One. 2014 Jun 10;9(6):e99448. doi: 10.1371/journal.pone.0099448. eCollection 2014.

Abstract

Objective: We investigated the role of the glutathione S-transferase A1, M1, P1 and T1 gene polymorphisms and potential effect modification by occupational exposure to different chemicals in Serbian bladder cancer male patients.

Patients and methods: A hospital-based case-control study of bladder cancer in men comprised 143 histologically confirmed cases and 114 age-matched male controls. Deletion polymorphism of glutathione S-transferase M1 and T1 was identified by polymerase chain reaction method. Single nucleotide polymorphism of glutathione S-transferase A1 and P1 was identified by restriction fragment length polymorphism method. As a measure of effect size, odds ratio (OR) with corresponding 95% confidence interval (95%CI) was calculated.

Results: The glutathione S-transferase A1, T1 and P1 genotypes did not contribute independently toward the risk of bladder cancer, while the glutathione S-transferase M1-null genotype was overrepresented among cases (OR = 2.1, 95% CI = 1.1-4.2, p = 0.032). The most pronounced effect regarding occupational exposure to solvents and glutathione S-transferase genotype on bladder cancer risk was observed for the low activity glutathione S-transferase A1 genotype (OR = 9.2, 95% CI = 2.4-34.7, p = 0.001). The glutathione S-transferase M1-null genotype also enhanced the risk of bladder cancer among subjects exposed to solvents (OR = 6,5, 95% CI = 2.1-19.7, p = 0.001). The risk of bladder cancer development was 5.3-fold elevated among glutathione S-transferase T1-active patients exposed to solvents in comparison with glutathione S-transferase T1-active unexposed patients (95% CI = 1.9-15.1, p = 0.002). Moreover, men with glutathione S-transferase T1-active genotype exposed to pesticides exhibited 4.5 times higher risk in comparison with unexposed glutathione S-transferase T1-active subjects (95% CI = 0.9-22.5, p = 0.067).

Conclusion: Null or low-activity genotypes of the glutathione S-transferase A1, T1, and P1 did not contribute independently towards the risk of bladder cancer in males. However, in association with occupational exposure, low activity glutathione S-transferase A1 and glutathione S-transferase M1-null as well as glutathione S-transferase T1-active genotypes increase individual susceptibility to bladder cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Case-Control Studies
  • Genetic Predisposition to Disease*
  • Glutathione S-Transferase pi / genetics
  • Glutathione Transferase / genetics*
  • Humans
  • Male
  • Middle Aged
  • Occupational Exposure / adverse effects*
  • Pesticides / adverse effects*
  • Polymorphism, Genetic*
  • Risk Factors
  • Serbia
  • Solvents / adverse effects*
  • Urinary Bladder Neoplasms / enzymology
  • Urinary Bladder Neoplasms / genetics*

Substances

  • Pesticides
  • Solvents
  • glutathione S-transferase T1
  • GSTA1 protein, human
  • GSTP1 protein, human
  • Glutathione S-Transferase pi
  • Glutathione Transferase
  • glutathione S-transferase M1

Grant support

This work was supported by the Ministry of Education and Science of the Republic of Serbia (Grants number: 175052 and 175087. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.