title: Cancers of unknown primary site: an enigmatic syndrome.
mesh_terms: D014408:Biomarkers, Tumor; D005770:Gastrointestinal Neoplasms / Q000473:pathology; D006801:Humans; D009362:Neoplasm Metastasis; D009382:Neoplasms, Unknown Primary / Q000175:diagnosis
chemical_list: D014408:Biomarkers, Tumor