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Gene-environment interactions in renal cell carcinoma
J C Semenza1, A Ziogas, J Largent
1School of Community Health, College of Urban and Public Affairs, Portland State University, Portland, OR 97207-0751, USA. semenzaj@pdx.edu
American Journal of Epidemiology
|April 27, 2001
Summary
Individuals with slow N-acetyltransferase 2 (NAT2) genotypes have a higher risk of developing renal cell carcinoma (RCC), especially when exposed to smoking. This gene-environment interaction highlights personalized risk factors for kidney cancer.
Area of Science:
- Oncology
- Genetics
- Environmental Health
Background:
- Renal cell carcinoma (RCC) incidence is rising, with smoking identified as a significant environmental risk factor.
- N-acetyltransferase 2 (NAT2) is an enzyme involved in metabolizing tobacco carcinogens, exhibiting genetic polymorphism.
- Understanding gene-environment interactions is crucial for elucidating RCC etiology.
Purpose of the Study:
- To investigate the association between NAT2 genotypes and RCC risk.
- To explore the interaction between NAT2 genotype and smoking in RCC development.
- To identify specific genetic predispositions that modify smoking-related kidney cancer risk.
Main Methods:
- A case-control study was conducted using RCC cases and population-based controls from Orange County, California (1994-1997).
- Genotyping for N-acetyltransferase 2 (NAT2) was performed on 115 cases and 259 controls.
- Statistical analysis included odds ratios (OR) and confidence intervals (CI) with stratified analyses for gene-environment interactions.
Main Results:
- Individuals with slow NAT2 acetylator genotypes exhibited a twofold increased risk of RCC (OR = 1.8; 95% CI: 1.1, 2.9).
- Smoking independently increased RCC risk (OR = 2.2; 95% CI: 1.3, 3.7).
- A significant gene-environment interaction was observed: slow acetylators who smoked had a substantially higher RCC risk (OR = 3.2; 95% CI: 1.7, 6.1) compared to rapid acetylators who smoked (OR = 1.4; 95% CI: 0.7, 2.9).
- A dose-response relationship between smoking pack-years and RCC risk was evident in slow acetylators (p < 0.01).
Conclusions:
- The study suggests that NAT2 genotype significantly modifies smoking-related RCC risk.
- Slow NAT2 acetylator status amplifies the risk of kidney cancer among smokers.
- These findings underscore the importance of genetic factors in personalized RCC risk assessment, particularly concerning environmental exposures like smoking.