4Shimosato Y. Controversies surrounding the subclassification of thymoma[J]. Cancer, 1994,74(2) : 542-544.
5Kuo T. Cytokeratin profiles of the thymus and thymomas: histogenetic correlations and proposal for a histological classification of thymomas[J]. Histopathology, 2000, 36 ( 5 ) : 403- 414.