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Updated: Jun 13, 2025
08:49
A 3D Organotypic Melanoma Spheroid Skin Model
Published on: May 18, 2018
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Malignant blue melanoma.
Yo Kaku1, Arnaud de la Fouchardière2
1Department of Biopathology, Center Léon Bérard, Lyon, France.
Clinics in Dermatology
|September 11, 2024
Summary
Malignant blue melanomas, originating from blue nevi, are driven by specific G-protein pathway mutations like GNAQ/GNA11. Loss of BAP1 expression indicates a poor prognosis for these rare scalp tumors.
Area of Science:
- Dermatology
- Oncology
- Genetics
Background:
- Malignant blue melanomas develop from blue nevi and related intradermal melanocytic proliferations.
- These tumors often present as rapidly growing scalp nodules within pre-existing lesions.
Purpose of the Study:
- To detail the genetic drivers, histopathological features, and prognostic factors of malignant blue melanomas.
Main Methods:
- Review of histopathological findings.
- Analysis of genetic mutations including GNAQ, GNA11, CYSLTR2, PCLB4, and gene fusions.
- Evaluation of BAP1 immunoreactivity.
Main Results:
- Mutations in the G-coupled protein pathway (GNAQ, GNA11) are common, with rare involvement of CYSLTR2, PCLB4, PKC, and GRM1.
- Tumors are dermal/subcutaneous, showing necrosis, atypical melanocytes, and often adjacent benign or intermediate blue nevi.
- Loss of nuclear BAP1 immunoreactivity is associated with a poor prognosis.
Conclusions:
- Malignant blue melanomas are characterized by specific genetic mutations and distinct histopathological features.
- BAP1 loss is a significant negative prognostic indicator in these rare melanomas.
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