Aberrant methylation of the FHIT gene in chronic smokers with early stage squamous cell carcinoma of the lung

Carcinogenesis
Jin Seuk KimDuk-Hwan Kim

Abstract

Fragile histidine triad (FHIT) gene plays an important role in the pathogenesis of lung cancer. However, the clinicopathological significance of CpG island hypermethylation of FHIT gene in non-small cell lung cancer (NSCLC) remains to be elucidated. We studied FHIT methylation in 254 NSCLCs in order to further understand the clinicopathological and prognostic significance of FHIT methylation in NSCLC. Methylation status of the FHIT gene was examined using Methylation-Specific PCR. All statistical analyses were two-sided, with a 5% type I error rate. Hypermethylation of the FHIT gene occurred more frequently in squamous cell carcinoma than adenocarcinoma. For 93 adenocarcinomas there was no statistically significant association between FHIT methylation and age, gender, smoking history, pathologic stage and p16 methylation. However, FHIT methylation in 125 squamous cell carcinomas was associated with exposure to tobacco smoke and p16 methylation, but not with age, gender and pathologic stage. Hypermethylation of FHIT in squamous cell carcinomas occurred more frequently in current smokers (45%) than in never-smokers (13%). FHIT methylation was significantly associated with p16 methylation in current- and ex-smokers (P = 0.02 and P...Continue Reading

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