Ang-2 expression in lung cancer (SPC-A-1, NCI-1650, A549, and NCI-1975) cells at protein-(Figure 3A and 3B) or mRNA-(Figure 3C) level was significantly higher (1.5~4 times) than that in lung Beas-2B cells, especially in overexpression of A549 and NCI-H1975 cells. This evidence concerns the gene ANGPT2 and lung cancer.