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Translationale Forschung und Diagnostik beim Mammakarzinom

Translational research and diagnostics for breast cancer

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Zusammenfassung

Beim Mammakarzinom wird erstmalig offensichtlich, wie aus tumorbiologischen Eigenschaften ein neues Klassifikationsprinzip entsteht, das wegen seiner auf therapeutische Konsequenzen ausgerichteten Pragmatik die traditionelle histomorphologische Klassifikation überlagert. Die auf molekularen Genexpressionsprofilen beruhenden intrinsischen Typen sind in immunhistochemischer Translation zu klinisch-pathologischen Kategorien geworden. Dabei werden ein tripelnegativer (basaler) Typ, die hormonrezeptorpositiven Luminal-A- und Luminal-B-Typen sowie ein HER2-Typ unterschieden. Insbesondere die Abgrenzung zwischen Luminal-A- und Luminal-B-Typ ist noch von Unschärfen geprägt. Neben dem Proliferationsmarker Ki-67 werden verschiedene Genexpressionsprofile zur Identifikation der Patientinnen herangezogen, die neben einer endokrinen Therapie von einer zusätzlichen Chemotherapie profitieren. Hier werden prospektive Studien weitere Evidenz schaffen müssen. Studiendaten stehen auch zur Heterogenität des tripelnegativen Typs aus, der u. a. die meisten BRCA-keimbahnmutierten Fälle einschließt, sowie zum HER2-Typ, bei dem die polysomen oder pseudopolysomen Fälle hinsichtlich ihrer Empfindlichkeit gegen gezielte Therapien zu überprüfen sind.

Abstract

In breast cancer, tumor biological markers are gaining impact and have become equal to traditional markers of pathology. Molecular expression profiling has led to new categories, which by receiving translation into immunohistochemical terms have entered routine pathology use. Besides the triple negative (basal) type, there are hormone receptor positive luminal A and B types and the HER2 type. The distinction between luminal A and B type is not yet clear cut and the proliferation marker Ki-67 as well as diverse RNA expression profiles are used for distinction in order to decide which patients might benefit from pure endocrine and which from combined chemo-endocrine therapy. Prospective studies are necessary to answer these questions. Study data are further awaited to clarify the heterogeneity of triple negative cases which include most of the BRCA1 associated cancers and to elucidate whether within the HER2 category, polysome or pseudopolysome cancer will respond to therapy.

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Kreipe, H. Translationale Forschung und Diagnostik beim Mammakarzinom. Pathologe 33 (Suppl 2), 282–290 (2012). https://doi.org/10.1007/s00292-012-1645-1

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