To verify that the expression of HLA-A and HLA-DRB1 were higher in teratoma patients with NMDAR-E than in teratoma patients without NMDAR-E, western blotting and IHC were performed on the teratoma tissue with and without NMDAR-E to identify the differences in HLA-A and HLA-DRB1 expression. Here, HLA-DRB1 is linked to teratoma.