The following western blotting assays further strengthened the evidence linking FN with CIP2A in bladder cancer tissues (n = 68) (Fig. 1c), meanwhile, Spearman’s correlation analysis revealed the positive correlation between the gray value of CIP2A and PCNA (r = 0.459, P < 0.001) (Fig. 1d). This evidence concerns the gene PCNA and urinary bladder cancer.