CD30 serves as an invaluable diagnostic marker to detect embryonal carcinoma from other types of germ cell tumors; additionally, its signaling could play a part in embryonal carcinoma cell survival and proliferation similar to its role in other forms of cancer; therefore, more research must be conducted into how CD30 influences embryonal carcinoma cells’ behavior [21]. The gene discussed is TNFRSF8; the disease is testicular germ cell tumor.