Melanoma of unknown primary is correctly classified by the AJCC melanoma classification from 2009.

Few studies have focused on the prognosis of melanoma of unknown primary (MUP). This study aimed (i) to determine prognostic factors for patients with MUP and (ii) to investigate whether the American Joint Committee on Cancer (AJCC) 2009 classification is suitable for MUP. Among 8897 patients with melanoma attending the university department of dermatology, Tuebingen, Germany, 172 (1.