In this series of 81 TET, including 37 thymic carcinomas and 44 thymomas (including type A and B3 thymomas and MNTLS) we have shown that a panel of CD117, BAP1, mTAP, and TdT can correctly predict 88.9% of thymic carcinomas and 77.8% of thymomas. The gene discussed is KIT; the disease is thymic epithelial neoplasm.