Histopathological evaluation of the specimens revealed the following: (a) an embryonal cell carcinoma of the right testis limited to the testis with lymphovascular invasion of pathological stage pT2 (Figure 1): staining with antibodies showed CD30(+) and a-FP(−); (b) a seminoma of the left testis, limited to the testis without invasion of the tunica albuginea or vascular invasion of pathological stage pT1 (Figure 2): staining with antibodies showed CD117(+), CD30(−), and a-FP(−). The gene discussed is TNFRSF8; the disease is seminoma.