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ESP, EORTC, and EURACAN Expert Opinion: practical recommendations for the pathological diagnosis and clinical management of intermediate melanocytic tumors and rare related melanoma variants

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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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Authors and Affiliations

Authors

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Contributions

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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Correspondence to Eduardo Calonje.

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Virchows Archiv conforms to the ICMJE recommendation for qualification of authorship. The ICMJE recommends that authorship be based on the following 4 criteria:

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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.

Supplementary Information

Fig. 1

Schematic view of the workflow (PNG 66 kb)

High Resolution Image (TIF 1376 kb)

Example 1

BAP1-inactivated melanocytic tumors (JPG 1072 kb)

High Resolution Image (TIF 80071 kb)

Example 2

Deep penetrating nevus (DPN) type lesions (JPG 982 kb)

High Resolution Image (TIF 82323 kb)

Example 3

Pigmented epithelioid melanocytoma (JPG 1250 kb)

High Resolution Image (TIF 91539 kb)

Example 4

Spitz tumors (JPG 910 kb)

High Resolution Image (TIF 81876 kb)

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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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