title: Letter: Radioimmunoassay for carcino-embryonic antigen.
mesh_terms: D002272:Carcinoembryonic Antigen / Q000302:isolation & purification*; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis*; D009362:Neoplasm Metastasis / Q000175:diagnosis* / Q000276:immunology; D011863:Radioimmunoassay
chemical_list: D002272:Carcinoembryonic Antigen