External validation in an Australian population of the EORTC-DeCOG nomogram predicting recurrence, distant metastasis and overall mortality in melanoma patients with positive sentinel lymph nodes

•Predicting outcomes for sentinel node-positive melanoma patients is important.•A recently published EORTC-DeCOG online nomogram estimates their prognosis.•This nomogram was externally validated in an Australian population.•The recurrence and distant metastasis prediction models were found to be robust.•The overall survival prediction model was less reliable for Australian patients.