CNOT2 and thymoma: In this study, we found elevated expression of CNOT2/9 in thymic epithelial cells in thymoma samples (compared with tumor‐adjacent normal tissues), which might have contributed to poor expression of MHC II in thymomas, thereby possibly affected T‐cell receptor signaling pathways (Hennecke and Wiley, 2001), and led to dysregulated T‐cell development.