the unlabeled antibody peroxidase-antiperoxidase technique was used to examine esophageal neoplasms for the tumor markers beta-human chorionic gonadotropin , human placental lactogen ( hpl ) , alpha-fetoprotein , carcinoembryonic antigen ( cea ) , and nonspecific cross-reacting antigen ( nca ) before and after xenotransplantation to athymic nude mice .
C0041365
tumor markers
C0007082
carcinoembryonic antigen