The median immunoreactivity of CD90+ cells per unit area of the tissue was dramatically elevated in bladder cancer compared with cystitis and polyp (Fig. 6c and d, p = 0.006, p = 0.038, respectively), but no statistical difference was observed between cystitis and polyps (Fig. 6c and d, p = 0.439). This evidence concerns the gene THY1 and chronic cystitis.