Tumor type		Frequency by cell type (%)	Presence of tumor markers by cell type (%)
			AFP	HCG
All germ cell tumors		100	50 to 75	40 to 60
Seminoma		42	0	9
Nonseminomatous germ cell tumors		58	65	56
	Embryonal cell carcinoma	26	70	60
	Teratocarcinoma	26	64	57
	Teratoma	5	37	25
	Choriocarcinoma	1	0	100
	Yolk sac	<1	75	25