the unlabeled antibody peroxidase-antiperoxidase technique was used to examine human malignant prostatic tissue ( primary tumors ) for the presence of prostate-specific antigen ( psa ) , carcinoembryonic antigen ( cea ) , nonspecific cross-reacting antigen ( nca ) , and beta-chorionic gonadotrophin ( hcg ) .
C0033572
prostatic
C0138741
prostate-specific antigen