CD5 and thymoma: Researchers have explored some markers to differentiate thymoma from thymic carcinoma, such as CD5, CD117, CD70, thymoproteasome-specific subunit β5t (β5t), Glucose transporter 1 (Glut-1), BRCA1 associated protein 1, methylthioadenosine phosphorylase, Terminal deoxynucleotidyl transferase (TdT) and Ki-67 labeling index [13–16].