Large tumor cellsNuclear OCT4 and widespread membranous KIT (or podoplanin)Absence of CD30 expressionAbsence of AFP expressionβ-hCG immunoreactivity in syncytiotrophoblastic giant cells (for the specificdiagnosis of germinoma with syncytiotrophoblastic elements)Absence of other germ cell tumor components (except syncytiotrophoblastic giantcells for the specific diagnosis of germinoma with syncytiotrophoblastic giantcells). This evidence concerns the gene POU5F1 and testicular germ cell tumor.