• 1
    Greco FA, Pavlidis N. Treatment for patients with unknown primary carcinoma and unfavorable prognostic factors. Semin Oncol 2009;36:6574.
  • 2
    van de Wouw AJ, Janssen-Heijnen ML, Coebergh JW, et al. Epidemiology of unknown primary tumours; incidence and population-based survival of 1285 patients in Southeast Netherlands, 1984–1992. Eur J Cancer 2002;38:40913.
  • 3
    Hemminki K, Bevier M, Hemminki A, et al. Survival in cancer of unknown primary site: population-based analysis by site and histology. Ann Oncol 2012;23:185463.
  • 4
    Vajdic C, Wyld L, Symons J. The challenge of attributing causality in cancer of unknown primary. Int J Cancer, in press.