About 10%: This was my answer off the top of my head and comfirmed by a quick visit to e-medicine. Don't mistake a seminoma that makes a lot of HCG for a true choriocarcinoma. Hope this helps; if you or someone special has primary testicular cancer, hoping you get a good result -- we'd rather the "chorio" not be there but be optimistic http://emedicine.Medscape.Com/article/1967796-overview.
Answered 6/10/2014
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