Previous studies have shown that most TET patients express PD-L1 (9, 10), and PD-L1 expression is related to the Masaoka stage and World Health Organization (WHO) pathological classification of TET (11–13), but there is still controversy regarding the prognostic significance of PD-L1 (11, 12, 14). The gene discussed is CD274; the disease is thymic epithelial neoplasm.