Clinicopathological character and long-term results of thymic epithelial tumor categorized by WHO classification

We analyzed clinicopathological character and long term results of 50 thymic epithelial tumors with reference to WHO histologic classification. There were 1 type A tumor, 8 type AB tumors, 13 type B1 tumors, 16 type B2 tumors, 10 type B3 tumors, and 2 type C tumors. Clinical stages were progressive in order of classification type A, AB, B1, B2, B3, and C. Type B1 and B2 were highly associated with myasthenia gravis (MG). There were four multiple thimic tumor in patients of advance clinical stage with polygonal epithelial cell tumor. Long term results were poor in order of the classification of type A, AB, B1, B2, B3, and C. In our study, WHO classification finely reflected the clinical character and prognosis of thymic epithelial tumors.