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Targeting des B-Zell-Rezeptors in aggressiven B-Zell-Lymphomen
Date:6/14/2013

STOCKHOLM, June 14, 2013 /PRNewswire/ --

Dr. Wyndham Wilson wird über aktuelle Entwicklungen bei der Behandlung von Lymphomen mit kleinen Molekülen berichten.

Obwohl in den vergangenen 30 Jahren eine wahre Fülle an Optionen zur Behandlung von diffusen großzelligen B-Zell-Lymphomen (DLBCL) entstanden ist, sind in diesem Bereich nur geringe Fortschritte erzielt worden. Aus neuesten Studien geht hervor, dass die Signalübertragung des B-Zell-Rezeptors für viele B-Zell-Lymphome ein entscheidender Faktor ist, darunter auch für den häufigsten Rezeptortyp - die sogenannten diffusen großzelligen B-Zell-Lymphome (DLBCL). Neueste Studien haben gezeigt, dass es sich bei DLBCL eigentlich um keine einzelne, sondern um mindestens 3 verschiedene Krankheiten handelt, von denen jede ganz eigene kritische Abnormalitäten aufweist, die das Überleben eines bösartigen Tumors begünstigen. Die am schwierigsten zu behandelnde Art von DLBCL wird als ABC-Subtyp (Activated B-cell) bezeichnet und hängt von einer abnormalen Signalübertragung des B-Zell-Rezeptors (BCR) ab. Untersuchungen von Dr. Lou Staudt haben gezeigt, dass derartige Tumoren absterben, sobald dieser Signaltransduktionsweg blockiert wird.

In Zusammenarbeit mit Dr. Lou Staudt, Pharmacyclics und Forschungskollegen haben wir eine klinische Studie eines äußerst potenten Inhibitors der Bruton-Tyrosinkinase (BTK) namens Ibrutinib durchgeführt. Die Hemmung der BTK durch Ibrutinib blockiert die abnormale BCR-Signalübertragung in ABC-DLBCL-Tumorzellen und tötet diese ab. In einer weiteren klinischen Studie, die mein Kollege im Zuge dieser EHA-Tagung präsentieren wird, zeigen wir, dass Tumoren von ABC-DLBCL-Patienten mithilfe von Ibrutinib abgetötet werden können. Noch wichtiger ist aber, das
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SOURCE European Hematology Association
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