The prognostic role of further positive non sentinel nodes in melanoma patients.

e20058 Background: The aim of the study was to investigate whether the non-sentinel node (NSN) status after nodal dissection affected prognosis in melanoma patients with positive SN. Methods: We retrospectively evaluated the clinicopathological data of 1,096 consecutive patients treated from 2000 to 2014 at a single institution, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy, who underwent completion lymph-node dissection (CLND) after a positivity of SN. The most frequently involved nodal basins were axilla, groin and neck; 507 positive SNs were detected in axillar basin, 477 in the inguinal-iliac one and 112 in the neck basin. Results: In the axillar nodal basin 18,7% of cases showed one or more positive further LN after the CLND. A similar rate of positive NSNs (18,5%) was found in patients who had inguinal and pelvic lymphadenectomy; of these cases, 23.2% of further positive nodes were observed in the inguinal basin while 13.8% were located in the iliac one. In the neck basin was detected...