title: [Metastatic unknown primary cancers. A simple definition, a poor prognosis].
authors.forename: Nicols
authors.initials: N
authors.lastname: Penel
mesh_terms: D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009382:Neoplasms, Unknown Primary / Q000453:epidemiology*; D011379:Prognosis