Abstract
Deleted in lung and esophageal cancer 1 (DLEC1) gene was a new candidate tumor suppressor gene. We determined the expression level and methylation status of DLEC1 in non-small-cell lung cancer (NSCLC), and the DLEC1 methylation in plasma DNA as a biomarker for NSCLC was further evaluated. The study population enrolled 78 paired NSCLC specimens and adjacent normal tissues and 25 benign pulmonary lesions. Meanwhile, corresponding plasma samples were collected. Methylation-specific polymerase chain reaction (PCR) was used to detect the DLEC1 methylation status. DLEC1 gene expression was determined by reverse transcriptase PCR and immunohistochemistry. Hypermethylation of DLEC1 was found in 41% (32/78) of NSCLC tissues, which was significantly higher than that of adjacent normal tissues (3.8%; 3/78) and benign lesions (0/25; P < .001). Also, DLEC1 methylation was closely correlated with loss of expression, and treatment with 5-aza-2'-deoxycytidine induced DLEC1 restoration in A549 and SPC-A1 cell lines. Furthermore, DLEC1 hypermethylation was associated with advanced stage (P = .011) and lymph node metastasis (P = .019). Methylated DLEC1 was detected in 35.9% (28/78) of plasma samples from NSCLC patients and only 2% (1/50) in cance...Continue Reading
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