title: Letter: Monitoring cancer with plasma carcinoembryonic antigen.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis; D002272:Carcinoembryonic Antigen / Q000032:analysis*; D005260:Female; D006801:Humans; D008722:Methods; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009369:Neoplasms / Q000175:diagnosis*; D012004:Rectal Neoplasms / Q000175:diagnosis
chemical_list: D002272:Carcinoembryonic Antigen