Tumor epithelial tumors: do we expect a brighter or a grey future?

Recent years have been very important for thymic epithelial tumors (TETs), due to several joined publications of the International Thymic Malignancies Interest Group (ITMIG) and International Association for the study of lung cancer (IASLC) (1-3). Together ITMIG and IASLC proposed a new TNM classification which was received by AJCC/UICC for the 8th edition of the TNM classification, while ITMIG alone (4) provided some consensus statements on the use of WHO histological classification.