Pathology revealed the mass to be a dysgerminoma with the positive expression of placental alkaline phosphatase (PLAP) and octamer-binding transcription factor 3/4 (OCT 3/4) (Fig. 1C), while other markers including CD117, CD30, chromogranin A, synaptophysin, S100, Ki67 were all negative expression (Not shown). Here, POU5F1 is linked to dysgerminoma.