Volume 35, Issue 8 pp. 1066-1077
Original Article

Sinonasal mucosal melanoma: Molecular profile and therapeutic implications from a series of 32 cases

Mario Turri–Zanoni MD

Mario Turri–Zanoni MD

Department of Otorhinolaryngology, University of Brescia, Brescia, Italy

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Daniela Medicina MS

Daniela Medicina MS

Department of Pathology, University of Brescia, Brescia, Italy

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Davide Lombardi MD

Davide Lombardi MD

Department of Otorhinolaryngology, University of Brescia, Brescia, Italy

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Marco Ungari MD

Marco Ungari MD

Department of Pathology, University of Brescia, Brescia, Italy

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Piera Balzarini MS

Piera Balzarini MS

Department of Pathology, University of Brescia, Brescia, Italy

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Cristina Rossini B.Tech

Cristina Rossini B.Tech

Department of Pathology, University of Brescia, Brescia, Italy

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Wilma Pellegrini B.Tech

Wilma Pellegrini B.Tech

Department of Pathology, University of Brescia, Brescia, Italy

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Paolo Battaglia MD

Paolo Battaglia MD

Department of Otorhinolaryngology, University of Insubria, Varese, Italy

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Carlo Capella MD

Carlo Capella MD

Department of Pathology, University of Insubria, Varese, Italy

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Paolo Castelnuovo MD

Paolo Castelnuovo MD

Department of Otorhinolaryngology, University of Insubria, Varese, Italy

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Gabriele Palmedo MD

Gabriele Palmedo MD

Dermatohistopathologische Gemeinschaftspraxis, Friedrichshafen, Germany

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Fabio Facchetti MD, PhD

Fabio Facchetti MD, PhD

Department of Pathology, University of Brescia, Brescia, Italy

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Heinz Kutzner MD

Heinz Kutzner MD

Dermatohistopathologische Gemeinschaftspraxis, Friedrichshafen, Germany

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Piero Nicolai MD

Piero Nicolai MD

Department of Otorhinolaryngology, University of Brescia, Brescia, Italy

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William Vermi MD

Corresponding Author

William Vermi MD

Department of Pathology, University of Brescia, Brescia, Italy

Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri

Department of Pathology, University of Brescia, Spedali Civili di Brescia, P.le Spedali Civili, 1, 25123, Brescia, ItalySearch for more papers by this author
First published: 12 July 2012
Citations: 119

Abstract

Background

Primary sinonasal mucosal melanomas are aggressive tumors with a poor clinical control by current treatments, raising the urgent need of novel strategies.

Methods

By fluorescence in situ hybridization (FISH), direct sequencing, and immunohistochemistry, we investigate the spectrum of molecular abnormalities in a cohort of 32 cases of primary sinonasal mucosal melanomas.

Results

We found that all primary sinonasal mucosal melanomas lack BRAF V600E mutation; in addition, they are characterized by somatic mutations of NRAS (22%) and KIT (12.5%), together with amplification of RREB1 (100%) and loss of MYB (76%). The large majority of cases showed KIT protein expression (96.9%). Among tumor suppressor genes, primary sinonasal mucosal melanomas showed loss of PTEN (48.1%) and p16/INK4a (55.2%). All tested cases showed expression of pAkt and pErk, suggesting a combined activation of PI3K/Akt and RAS-mitogen-activated protein kinase (MAPK) pathways.

Conclusions

This molecular fingerprint strongly argues against the clinical efficacy of BRAF-inhibitors, but could candidate primary sinonasal mucosal melanomas to therapeutic strategies targeting RAS and KIT mutations or inhibiting PI3K-Akt-mTOR pathway. Head Neck, 2013

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