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Gastrointestinale Stromatumoren

Evolution eines Tumorkonzepts von unklassifizierbaren Neoplasien zur zielgerichteten molekularen Therapie

Gastrointestinal stromal tumors

Evolution of a tumor concept from unclassifiable neoplasms to targeted molecular therapy

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Zusammenfassung

Die Entdeckung onkogener C-KIT- und PDGFRA-Mutationen in gastrointestinalen Stromatumoren (GIST) legte die Grundlagen für eine innovative zielgerichtete molekulare Therapie mit den Tyrosinkinaseinhibitoren (TKI) Imatinib (Glivec®), Sunitinib und anderen Substanzen. Dies setzt eine präzise histopathologische Diagnose voraus, ergänzt durch eine Risikostratifizierung zur Abschätzung des malignen Potenzials. Zudem zeigen neuere Erkenntnisse, dass der Nachweis von Mutationen in C-KIT und PDGFRA sowie deren Art und auch die Lokalisation der Mutation innerhalb der Gensequenz von großer Bedeutung für Therapie (Substanzauswahl, Dosisbestimmung, Evaluation sekundärer Resistenz) und Prognose sind. In diesem Artikel wird eine Übersicht über aktuelle Entwicklungen in der histopathologischen und molekularen Diagnostik von GIST und die Relevanz der Mutationsanalyse für die Therapieoptimierung vermittelt.

Abstract

The discovery of activating oncogenic C-KIT and PDGFRA mutations in gastrointestinal stromal tumors (GIST) represented the key for the development of innovative targeted molecular therapy using the tyrosine kinase inhibitors (TKI) Imatinib (Glivec®), Sunitinib and other substances. This makes a precise histopathological diagnosis a major prerequisite, supplemented by appropriate risk stratification for the assessment of the expected biological behavior of individual tumors. Current knowledge demonstrates that the presence of kinase mutations in C-KIT and PDGFRA and their localization within the gene sequence as well as the mutation type are of great importance for planning appropriate treatment (drug selection and dose recommendation), but also for the assessment of prognosis and explanation of secondary resistance to TKI after initial response. This article gives an overview on current developments in the histopathological and molecular diagnostics of GIST and the role of kinase mutation analysis for optimizing patient treatment.

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Interessenkonflikt

Der korrespondierende Autor weist auf folgende Beziehungen hin: Priv.-Doz. Dr. Agaimy und Prof. Dr. Schneider-Stock erhielten Vortragshonorare von der Firma Novartis.

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Agaimy, A., Schneider-Stock, R. Gastrointestinale Stromatumoren. Pathologe 31, 115–122 (2010). https://doi.org/10.1007/s00292-009-1247-8

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