Zusammenfassung
Während das maligne Melanom (MM) im frühen Stadium eine günstige Prognose aufweist, liegt die 5-Jahres-Überlebensrate bei Fernmetastasierung unter 10%. Aufgrund einer molekular definierten Typsierung des MM ist es erstmals gelungen, mithilfe spezifischer Inhibitoren der mutierten BRAF-Kinase (Vemurafinib, Dabrafenib) Biomarker-basierte zielgerichtete Therapien mit hoher Ansprechrate in der metastasierten Situation zu entwickeln. Daraus ergibt sich für die Pathologie die Notwendigkeit zur qualitätsgesicherten BRAF-Mutationsanalyse im klinischen Alltag. Andererseits erfordert das Neuauftreten plattenepithelialer Neoplasien (v. a. Keratoakanthome) unter der zielgerichteten Therapie sowie die relativ schnelle Resistenzentwicklung (meist <6 Monaten) weitergehende translationale Forschungsansätze. Dementsprechend konnten bereits am Signalweg der BRAF-(MAP-)Kinase orientierte Medikamente, wie z. B. MEK-Inhibitoren, erfolgreich eingesetzt werden. Die mögliche Bedeutung der molekularen Charakterisierung weiterer spezifischer Subtypen des MM (arkral, mukosal, uveal) anhand des jeweils typischen Mutationsspektrums (z. B. cKIT , NRAS , GNAQ) wird nachfolgend aufgezeigt.
Abstract
Although early stage malignant melanoma (MM) has a favorable prognosis five year survival rate is poor (<10%) in patients suffering from distant metastases. Due to molecular typing of MM recently high response rates were achieved in metastatic MM by using specific inhibitors directed against the mutated form of BRAF kinase, e.g. Vemurafinib and Dabrafinib. Therefore BRAF mutation analysis has become standard of care in advanced MM and pathologists are urged to provide a quality guaranteed molecular diagnostics. However, squamous neoplasias (e. g., keratoacanthomas) and recurrences of MM mostly within 6 months during targeted therapy point to the need of further translational research. Thus new drugs, such as MEK inhibitors, based on the MAP-kinase pathway downstream of BRAF have already effectively been used. Finally, the impact of molecular characteristics in different subtypes of MM (acral, mucosal, uveal) will be discussed with respect to their specific mutational spectrum (e.g. cKIT , NRAS , GNAQ).
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Rüschoff, J., Kleinschmidt, M. & Middel, P. Translationale Forschung und Diagnostik beim Melanom. Pathologe 33 (Suppl 2), 291–295 (2012). https://doi.org/10.1007/s00292-012-1661-1
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DOI: https://doi.org/10.1007/s00292-012-1661-1