Abstract
The recent WHO classification of skin tumors has underscored the importance of acknowledging intermediate grade melanocytic proliferations. A multistep acquisition of oncogenic events drives the progressive transformation of nevi into melanomas. The various pathways described are modulated by the initial oncogenic drivers that define the common, blue, and Spitz nevi groups. Intermediate lesions are most often the result of a clonal evolution within such nevi. Based on this established classification, we have suggested for each pathway a practical diagnostic approach, benefiting from the recently developed molecular tools, both in the setting of general pathology labs and expert centers. Moreover, recommendations regarding the re-excision and clinical follow-up are given to support decision-making in multidisciplinary tumor boards.
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AF and DM conceived the study. AF provided the cases for the examples and wrote the manuscript. WB, LCK, BL, SPN, SP, LA, EC, and DM edited and reviewed the manuscript.
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Foreword: this work is the result of a collaborative effort between the European Organisation for Research and Treatment of Cancer (EORTC) Melanoma Group, the European Society of Pathology (ESP), and the European Rare Adult Cancer Network (EURACAN). It was initiated by members of the pathology subgroup of EORTC Melanoma Group, presented and discussed at the EORTC Melanoma Group meeting October 11, 2019 in Florence, Italy. The draft was later circulated to the cited representative authors of EORTC Melanoma Group, ESP, and EURACAN until consensus was met.
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de la Fouchardiere, A., Blokx, W., van Kempen, L.C. et al. ESP, EORTC, and EURACAN Expert Opinion: practical recommendations for the pathological diagnosis and clinical management of intermediate melanocytic tumors and rare related melanoma variants. Virchows Arch 479, 3–11 (2021). https://doi.org/10.1007/s00428-020-03005-1
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DOI: https://doi.org/10.1007/s00428-020-03005-1