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Li W.,Key Laboratory of Green Packaging and Application of Biological Nanotechnology of Hunan Province | Deng J.,Hunan University of Technology | Wang S.-S.,Key Laboratory of Green Packaging and Application of Biological Nanotechnology of Hunan Province | Ma L.,Key Laboratory of Green Packaging and Application of Biological Nanotechnology of Hunan Province | And 3 more authors.
Asian Pacific Journal of Cancer Prevention | Year: 2014

Pathogenesis of lung cancer is a complicated biological process including multiple genetic and epigenetic changes. Since cigarette smoking is confirmed as the most main risk factor of non-small cell lung cancer (NSCLC), the aim of this study was to determine whether tobacco exposure plays a role in gene methylation. Methylation of the RAR-β gene were detected using methylation-specific polymerase chain reaction in DNA from 167 newly diagnosed cases with NSCLC and corresponding 105 controls. A significant statistical association was found in the detection rate of the promoter methylation of RAR-β gene between NSCLC and controls (x2=166.01; p < 0.01), and hypermethylation of the RAR-β gene was significantly associated with smoking status (p=0.038, p < 0.05). No relationship was found between RAR-β gene methylation and pathologic staging including clinical stage, cell type, gender and drinking (p > 0.05), and the methylation of RAR-β gene rate of NSCLC was slightly higher in stages III+IV (80.0%) than in I+II (70.8%). Similar results were obtained for methylation of the RAR-β gene between squamous cell carcinoma (77.9%) and other cell type lung cancer (73.9%). These results showed that the frequency of methylation increased gradually with the development of clinical stage in smoking-associated lung cancer patients, and tobacco smoke may be play a potential role in RAR-β gene methylation in the early pathogenesis and process in lung cancer, particularly squamous cell carcinoma. Aberrant promoter methylation is considered to be a promising marker of previous carcinogen exposure and cancer risk. Source

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