The number of metastatic lymphnodes is a useful predictive factor for recurrence after surgery for non-metastatic nonfunctional neuroendocrine tumor of the pancreas. (2020) - Nappo, G.; Smiroldo, V.; Spaggiari, P.; Gavazzi, F.; Ridolfi, C.; Capretti, G.; Dionisi, G.; Carrara, S.; Preatoni, P.; Lania, A.; Zerbi, A.