ZEB2 was found to be strong positive (score between 100 and 300) in 76.67% (46/60) SCLC tissue samples, moderate positive (score between 20 and 100) in 5% (3/60), weak expression (score between 10 and 20) in 6.67% (4/60), and negative expression (score 0) in 11.67% (7/60, Additional file 8: Figure S7). Here, ZEB2 is linked to small cell lung carcinoma.