KRT19 and non-small cell lung carcinoma: There was no significant difference in the mRNA expression levels of the other gene markers, CK19 (P = 0.269), CEA (P = 0.137), VEGF-C (P = 0.183) or hnRNP A2/B1 (P = 0.370), in peripheral blood among NSCLC patients at different pathologic stages (Figure 3).