KMT2A and leukemia: The translocations variably involved exons 8, 9, 10, or 11 of KMT2A and exon 2 of MAML2, and are highly characteristic of type B2 and B3 thymomas, because they were previously found only in very rare leukemias, myelodysplastic syndromes, and one plasmacytoma but not in any other tumor among over 250.000 cases sequenced by Foundation Medicine, including 266 thymic carcinomas [46].