human esophageal neoplasms were studied in comparison to normal , uninvolved , and preneoplastic human esophageal epithelium for the presence of human chorionic gonadotropin ( hcg ) , human placental lactogen ( hpl ) , alpha-fetoprotein ( afp ) , carcinoembryonic antigen ( cea ) , and nonspecific cross-reacting antigen ( nca ) using the unlabeled antibody peroxidase-antiperoxidase technique .
C0086418
human
C0002210
alpha-fetoprotein