HOXA9 and non-small cell lung carcinoma: Consistently, further Western Blot results validated that HOXA9 was high expressed in DDP-resistant NSCLC cells at protein levels (Fig. 1f, g), suggesting that the expression patterns of circRNA CDR1as, miR-641 and HOXA9 were changed in DDP-resistant NSCLC cells, and miR-641 negatively correlated with circRNA CDR1as and HOXA9.