Table I. Correlation between circulating PCTK1 mRNA levels and clinical pathologic features in the NSCLC patients.

^aThe cut-off value is set with sensitivity of 60% and specificity of 85%. The p-value is the probability for a Chi-square test. AD: Adenocarcinoma; SCC: squamous cell carcinoma; TKI: tyrosine kinase inhibitor treatment; EGFR: epithelial growth factor receptor.