CASP9 and thymic carcinoma: We also evaluated the expression distribution of those four antibodies between low-grade TETs (including type-A, type-AB, typeB1, and metaplastic thymoma) and high-grade TETs (including type-B2, type-B3, and thymic carcinoma), and found that c-Jun, Caspase-9, and p73 expression was statistically significant with high-grade TETs, the P-values were 0.002, 0.019, and 0.004, respectively.