HOXA9 and non-small cell lung carcinoma: The results showed that deficiency of CircRNA CDR1as significantly increased apoptosis ratio in cisplatin treated DDP-resistant NSCLC cells, and the promoting effects of circRNA CDR1as on DDP-resistant NSCLC cell death were abrogated by silencing miR-641 and upregulating HOXA9 (Fig. 4f).