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Three definitions of negative tumor markers and the distribution of the cases. AFP (−) = alpha-fetoprotein <10 ng/mL; HCG/HCG-β (−) = undetected human chorionic gonadotropin/human chorionic gonadotropin-β subunit; HCG/HCG-β (+) = human chorionic gonadotropin detected but <50 mIU/mL or human chorionic gonadotropin-β subunit detected but <5 ng/mL (mIU/mL).
