title: Metastatic malignancies of unknown primary site and malignancies of unknown origin whether primary or metastatic.
authors.forename: Fayek
authors.initials: F
authors.lastname: Al-Hilli
authors.forename: Naseem A
authors.initials: NA
authors.lastname: Ansari
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology / Q000473:pathology / Q000556:secondary*; D001707:Biopsy, Needle; D015331:Cohort Studies; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D015994:Incidence; D007493:Iraq / Q000453:epidemiology; D008297:Male; D008403:Mass Screening; D009369:Neoplasms / Q000453:epidemiology* / Q000473:pathology*; D009382:Neoplasms, Unknown Primary / Q000453:epidemiology / Q000473:pathology*; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D016019:Survival Analysis