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Expression of ZO-1 in NSCLC and adjacent noncancerous tissue. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was performed to detect the expression of ZO-1 mRNA in NSCLC compared with peritumoral tissue using GAPDH as a normalization control. ZO-1 mRNA levels were significantly lower in NSCLC compared with corresponding non-cancerous tissues (P<0.05). Bars indicate standard error (S.E.).
