Moderne Antikoagulation mit FXa-Inhibitoren in der Onkologie: Ist die gastrointestinale Blutungsrate (mit)-entscheidend?

Zusammenfassung

Das erhöhte Thrombose- und Blutungsrisiko bei aktiver Tumorerkrankung wird als sog. „thrombo-hämorrhagisches Syndrom“ bezeichnet, welches hohe Anforderungen an die Antikoagulation stellt. Aktuell liegen 4 randomisierte, prospektive Studien zum Einsatz von neuen, nicht Vitamin K-abhängigen oralen Antikoagulantien (NOAK) zur Behandlung von in der Onkologie aufgetretenen venösen Thromboembolien (VTE) vor. Dabei wurden die FXa-Inhibitoren Rivaroxaban, Edoxaban und zweimal Apixaban jeweils in einzelnen Studien gegenüber dem Standardtherapeutikum Dalteparin eingesetzt. Da es keinen direkten Head-to-Head-Vergleich der genannten FXa-Inhibitoren innerhalb einer Studie gibt, wurde zu jedem NOAK die jeweils größte Studie – stets verglichen gegenüber Dalteparin – ausgewertet. Die Studien wurden bzgl. ihrer Wirksamkeit, Sicherheit, fataler Blutungsraten, dem Risiko für gastrointestinale Blutungen (GIB) und sonstiger Unterschiede anhand deskriptiver Statistik analysiert. Unter Dalteparin ergab sich eine mittlere VTE-Rezidivrate von ca. 9% bei einem 6-monatigen Behandlungszeitraum. Alle 3 FXa-Inhibitoren waren gegenüber Dalteparin bezüglich der Wirksamkeit nicht unterlegen. Die VTE-Rezidivrate war bei mit Edoxaban und Apixaban behandelten Patienten um – 2,3% und bei Rivaroxaban um – 5,0% niedriger.

Bei der Sicherheit fanden sich – jeweils gegenüber Dalteparin – für Rivaroxaban und Edoxaban eine erhöhte Rate an schweren Blutungen (jeweils +2,4%); insbesondere war hierbei die Zahl GIB deutlich erhöht. Dagegen war für Apixaban die Zahl schwerer Blutungen, wie auch für verschiedene Blutungstypen inkl. GIB, nicht erhöht. In der Apixabanstudie war insgesamt die Rate von schweren GIB, die ca. 50% aller schweren Blutungen ausmachten, und die der klinisch-relevanten nicht schweren Blutungen, am niedrigsten. Die FXa-Inhibitoren sind der Standardtherapie mit Dalteparin in der VTE-Rezidivrate bei onkologischen Patienten nicht unterlegen. Die GIB-Rate scheint ein wichtiger prädiktiver Faktor für die Sicherheit dieser Substanzgruppe zu sein, sodass Tumorlokalisation, gastrointestinale Risikofaktoren und andere individuelle Kriterien in Zukunft stärker bei der Therapieentscheidung für oder gegen einen FXa-Inhibitor berücksichtigt werden sollten.

Abstract

The increased risk of thrombosis and bleeding with an active tumor disease is known as the so-called “thrombo-hemorrhagic syndrome”, which places high demands on anticoagulation. There are currently 4 randomized, prospective studies on the use of new, non-vitamin K dependent oral anticoagulants (NOAC) for the treatment of venous thromboembolism (VTE) that have occurred in oncology. The FXa inhibitors rivaroxaban, edoxaban and twice apixaban were each used in individual studies versus the standard therapeutic agent dalteparin. Since there is no direct head-to-head comparison of the FXa inhibitors mentioned within a study, the largest study – always compared to dalteparin – was evaluated for each NOAC. The studies were analyzed with regard to their effectiveness, safety, fatal bleeding rates, the risk of gastrointestinal bleeding (GIB) and other differences using descriptive statistics. With dalteparin, the mean VTE recurrence rate was approximately 9% over a 6-month treatment period. All three FXa inhibitors were not inferior to dalteparin in terms of potency. The VTE recurrence rate was – 2.3% lower in edoxaban and apixaban-treated patients and – 5.0% in rivaroxaban-treated patients. In terms of safety, there was an increased rate of severe bleeding (both + 2.4%) for rivaroxaban and edoxaban compared to dalteparin; in particular, the number of GIBs was significantly increased. In contrast, the number of severe bleeding was not increased for apixaban, as was the case for various bleeding types including GIB. In the Apixaban study, the overall rate of severe GIB, which accounted for about 50% of all severe bleeding, and that of clinically relevant non-severe bleeding, were the lowest. The FXa inhibitors are not inferior to the standard therapy with dalteparin in the VTE recurrence rate in oncological patients. The GIB rate appears to be an important predictive factor for the safety of this group of substances, so that tumor location, gastrointestinal risk factors and other individual criteria should be given greater consideration in future therapy decisions for or against an FXa inhibitor.

Schlüsselwörter

Maligne Tumorerkrankungen - venöse Thromboembolien - Niedermolekulare Heparine - Vitamin K Antagonisten - nicht Vitamin K-abhängige orale Antikoagulantien

Keywords

malignant tumor diseases - venous thromboembolism - low molecular weight heparins - vitamin K antagonists - non-vitamin K dependent oral antocoagulants

Publication History

Received: 28 November 2021

Accepted: 21 June 2022

Article published online:
25 July 2022

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