MMP9 and non-small cell lung carcinoma: The results showed that the expression of circDENND4C (Figure 1A) or MMP-9 (Figure 1C) was significantly upregulated in all NSCLC cell lines, while the expression of miR-200b (Figure 1B) was significantly downregulated in some NSCLC cell lines, especially A549 and SK-MES-1, as compared to the normal HBE cells.