PRSS16 and thymoma: PSMB11 (Beta5T) and Cathepsin V represented strong cortical epithelial cell markers for differentiating type A and type B thymoma, whereas PRSS16 showed almost no differentiating power between type A and type B. However, PRSS16 appears to be a strong classifier to differentiate the thymoma from TSCC and normal/adjacent thymus tissues.