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• W2997504868 abstract "<h2>Abstract</h2> Melanomas that have histopathologic features that overlap with those of Spitz nevus are referred to as spitzoid melanomas. However, the diagnostic concept is used inconsistently and genomic analyses suggest it is a heterogeneous category. Spitz tumors, the spectrum of melanocytic neoplasms extending from Spitz nevi to their malignant counterpart Spitz melanoma, are defined in the 2018 WHO classification of skin tumors by the presence of specific genetic alterations, such as kinase fusions or HRAS mutations. It is unclear what fraction of spitzoid melanomas defined solely by their histopathologic features belong to the category of Spitz melanoma or to other melanoma subtypes. We assembled a cohort of 25 spitzoid melanomas diagnosed at a single institution over an 8-year period and performed high-coverage DNA sequencing of 480 cancer related genes. Transcriptome wide RNA sequencing was performed for select cases. Only nine cases (36%) had genetic alterations characteristic of Spitz melanoma, including <i>HRAS</i> mutation or fusion involving <i>BRAF</i>, <i>ALK</i>, <i>NTRK1</i>, or <i>MAP3K8</i>. The remaining cases were divided into those with an MAPK activating mutation and those without an MAPK activating mutation. Both Spitz melanoma and spitzoid melanomas in which an MAPK-activating mutation could not be identified tended to occur in younger patients on skin with little solar elastosis, infrequently harbored <i>TERT</i> promoter mutations, and had a lower burden of pathogenic mutations than spitzoid melanomas with non-Spitz MAPK-activating mutations. The MAPK-activating mutations identified affected non-V600 residues of BRAF as well as NRAS, MAP2K1/2, NF1, and KIT, while BRAF V600 mutations, the most common mutations in melanomas of the WHO low-CSD category, were entirely absent. While the spitzoid melanomas comprising our cohort were enriched for bona fide Spitz melanomas, the majority of melanomas fell outside of the genetically defined category of Spitz melanomas, indicating that histomorphology is an unreliable predictor of Spitz lineage." @default.
• W2997504868 created "2020-01-10" @default.
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• W2997504868 date "2020-06-01" @default.
• W2997504868 modified "2023-10-15" @default.
• W2997504868 title "Spitz melanoma is a distinct subset of spitzoid melanoma" @default.
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• W2997504868 doi "https://doi.org/10.1038/s41379-019-0445-z" @default.
• W2997504868 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7286778" @default.
• W2997504868 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31900433" @default.
• W2997504868 hasPublicationYear "2020" @default.
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