In TETs, 10 (67 %) of 15 type A thymomas and 14 (47 %) of 30 thymic carcinomas expressed p16INK4A, wheras only one of 17 (6 %) B3 thymomas exhibited a low p16INK4A positivity (Table 4, Fig. 8). This evidence concerns the gene CDKN2A and thymoma.