HOXA9 and non-small cell lung carcinoma: As expected, the CCK-8 assay (Fig. 4d) and trypan blue assay (Fig. 4e) results showed that knock-down of CircRNA CDR1as enhanced the inhibiting effects of DDP on cell proliferation and viability in DDP-resistant NSCLC cells, which were reversed by downregulating miR-641 and overexpressing HOXA9.