Abstract
Purpose: Polycyclic aromatic hydrocarbons are activated by cytochrome P450 1A1 (CYP1A1) and inactivated by glutathione S-transferase mu (GSTM1). Therefore, it is expected that a combination of proficient CYP1A1 genotype with deficient GSTM1 variant would result in particularly elevated lung cancer (LC) risk, especially for squamous cell carcinoma (SCC). This study was aimed to validate whether the CYP1A1-C 3801 (CYP1A1*2) allele has an unfavorable significance alone and/or in combination with the GSTM1 deficiency. Methods: We compared the distribution of CYP1A1 and GSTM1 genotypes in LC patients (n=141), healthy donors (HD, n=204), and elderly tumor-free smokers and non-smokers (ED, n=246). Results: CYP1A1*2 allele carriers demonstrated a clear-cut association with SCC: the adjusted odds ratios (OR) were 2.22 (95% CI=1.06–4.63) and 2.27 (95% CI=1.14–4.52) when HD and ED were used as referents, respectively. CYP1A1*2(+)/GSTM1(-) combined genotypes were overrepresented in the SCC patients (14/70, 20.0%) and underrepresented in the ED (19/246, 7.7%) as compared to the intermediate prevalence in the HD (26/204, 12.7%); the adjusted OR for SCC versus ED reached 3.85 (95% CI=1.43–10.33). Conclusions: In agreement with some literature data, our results support the concerted role of CYP1A1 and GSTM1 at-risk genotypes in SCC predisposition.
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Abbreviations
- LC:
-
Lung cancer
- SCC:
-
Squamous cell carcinoma
- HD:
-
Healthy donors
- ED:
-
Elderly donors
- OR:
-
Odds ratio
- CI:
-
Confidence interval
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Acknowledgements
We are grateful to Prof. Vladimir G. Lemehov for providing clinical expertize. We also thank Mrs. Olga S. Yatsuk, Olga A. Zaitseva and Liudmila V. Rikunova for the technical assistance. The work was supported by INTAS (grant 99–01391) and RFBR (grant 02–04–49794)
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Belogubova, E.V., Ulibina, Y.M., Suvorova, I.K. et al. Combined CYP1A1/GSTM1 at-risk genotypes are overrepresented in squamous cell lung carcinoma patients but underrepresented in elderly tumor-free subjects. J Cancer Res Clin Oncol 132, 327–331 (2006). https://doi.org/10.1007/s00432-005-0071-7
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DOI: https://doi.org/10.1007/s00432-005-0071-7