Baseline serum levels of Ang-2 in both SCLC and NSCLC were significantly higher than that of the control group (SCLC: median concentration; 3479 pg/mL vs. 2148 pg/mL, p < 0.0001, NSCLC: median concentration; 3508 pg/mL vs. 2148 pg/mL, p < 0.0001, Table 2). Here, ANGPT2 is linked to small cell lung carcinoma.