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Methylation of the candidate biomarker TCF21 is very frequent across a spectrum of early‐stage nonsmall cell lung cancers

The transcription factor TCF21 is involved in mesenchymal‐to‐epithelial differentiation and was shown to be aberrantly hypermethylated in lung and head and neck cancers. Because of its reported high frequency of hypermethylation in lung cancer, further characterization of the stages and types of nonsmall cell lung cancer (NSCLC) that are hypermethylated and the frequency of hypermethylation and associated “second hits” were assessed.