[Genetic polymorphisms of cytochrome P450 2E1 and glutathione S-transferase P1 and susceptibility to esophageal cancer].
OBJECTIVE
To study the association between genetic polymorphisms of cytochrome P4502E1 (CYP2E1) and/or glutathione S-transferase P1 (GSTP1) and susceptibility to esophageal cancer.


METHODS
Genotyping of CYP2E1 and GSTP1 was performed using PCR-based RFLP analysis on DNA isolated from surgically removed esophageal tissues or scraped esophageal epithelium from cancer cases (n = 45), severe epithelial hyperplasia cases (n = 45), and normal controls (n = 45).


RESULTS
The variant genotypes (c1/c2 and c2/c2) detected by RsaI digestion was found in 17% of epithelial hyperplasia cases, 20.0% of esophageal cancer cases and 55.6% of controls, with the differences being statistically significant (P < 0.001). Subjects carrying wild-type genotype of CYP2E1 had more than 5-fold risk for developing severe epithelial hyperplasia (odds ratio, OR = 5.78; 95% confidence interval, CI = 2.2-15.2) and esophageal cancer (OR = 5.00; 95% CI = 2.0-12.8). No association with the risk of severe epithelial hyperplasia and esophageal cancer was observed for the DraI polymorphism of CYP2E1 or for the Awl26I polymorphism of GSTP1.


CONCLUSIONS
CYP2E1 is a genetic susceptibility factor involved in the early events for esophageal carcinogenesis.
Lin
D
D
Cancer Institute(Hospital), Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing.
Tang
Y
Y
Peng
Q
Q
D000328:Adult; D000368:Aged; D019392:Cytochrome P-450 CYP2E1 / Q000235:genetics*; D004198:Disease Susceptibility; D004938:Esophageal Neoplasms / Q000235:genetics*; D005260:Female; D005838:Genotype; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase / Q000235:genetics*; D006801:Humans; D007527:Isoenzymes / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011230:Precancerous Conditions / Q000235:genetics*
D007527:Isoenzymes; D019392:Cytochrome P-450 CYP2E1; C496556:GSTP1 protein, human; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase