Expression level of SERPINA4, hsa_circ_0006215 and miR-378-3p. (A) Expression level of SERPINA4 quantified by western blot analysis. GAPDH protein was used as an internal control. Results are the mean ± standard error of the mean. *P<0.05. (B) Expression level of hsa_circ_0006215 and miR-378-3p in the overexpression group, silence group and normal group. *P<0.05 vs. control P, paracancerous; PC, pancreatic cancer; hsa, human; circ, circular RNA; miR, microRNA.