Education, tobacco smoking, alcohol consumption, and IL-2 and IL-6 gene polymorphisms in the survival of head and neck cancer
López, R. V. M; Zago, M. A; Eluf-Neto, J; Curado, M. P; Daudt, A. W; da Silva-Junior, W. A; Zanette, D. L; Levi, J. E; de Carvalho, M. B; Kowalski, L. P; Abrahão, M; de Góis-Filho, J. F; Boffetta, P; Wünsch-Filho, V.
Braz. j. med. biol. res
; 44(10): 1006-1012, Oct. 2011. ilus, tab
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| LILACS | ID: lil-600699
The association of education, tobacco smoking, alcohol consumption, and interleukin-2 (IL-2 +114 and -384) and -6 (IL-6 -174) DNA polymorphisms with head and neck squamous cell carcinoma (HNSCC) was investigated in a cohort study of 445 subjects. IL-2 and IL-6 genotypes were determined by real-time PCR. Cox regression was used to estimate hazard ratios (HR) and 95 percent confidence intervals (95 percentCI) of disease-specific survival according to anatomical sites of the head and neck. Mean age was 56 years and most patients were males (87.6 percent). Subjects with 5 or more years of schooling had better survival in larynx cancer. Smoking had no effect on HNSCC survival, but alcohol consumption had a statistically significant effect on larynx cancer. IL-2 gene +114 G/T (HR = 0.52; 95 percentCI = 0.15-1.81) and T/T (HR = 0.22; 95 percentCI = 0.02-3.19) genotypes were associated with better survival in hypopharynx cancer. IL-2 +114 G/T was a predictor of poor survival in oral cavity/oropharynx cancer and larynx cancer (HR = 1.32; 95 percentCI = 0.61-2.85). IL-2 -384 G/T was associated with better survival in oral cavity/oropharynx cancer (HR = 0.80; 95 percentCI = 0.45-1.42) and hypopharynx cancer (HR = 0.68; 95 percentCI = 0.21-2.20), but an inverse relationship was observed for larynx cancer. IL-6 -174 G/C was associated with better survival in hypopharynx cancer (HR = 0.68; 95 percentCI = 0.26-1.78) and larynx cancer (HR = 0.93; 95 percentCI = 0.42-2.07), and C/C reduced mortality in larynx cancer. In general, our results are similar to previous reports on the value of education, smoking, alcohol consumption, and IL-2 and IL-6 genetic polymorphisms for the prognosis of HNSCC, but the risks due to these variables are small and estimates imprecise.
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