Factors of the extrinsic pathway of blood coagulation in tumour associated macrophages

R. Adany, J. Kappelmayer, E. Berenyi, A. Szegedi, E. Fabian, L. Muszbek

Research output: Article

19 Citations (Scopus)


Despite the growing evidence implicating intratumoural fibrin formation in the progression of malignant tumours, the origin of coagulation factors that participate in extravascular clotting has not been elucidated. Using immunohistochemical methods we attempted to detect and localize clotting factors of extrinsic pathway in different human malignant tumours. Coagulation factors II, V, VIII and X (FII, FV, FVII, and FX) were detected in a huge number of cells showing spindle-shaped or stellate morphology. By double immunohistochemical labellings it was demonstrated that cells containing these clotting factors express monocyte/macrophage differentiation marker antigens recognized by Leu M3, Ki M7 and DAKO-macrophage monoclonal antibodies, i.e. they represent monocyte-derived, phagocytic tumour associated macrophages (TAMs). These findings suggest that TAMs can be viewed as clot cells, which in addition to the initiation of extravascular clotting by expressing procoagulant activity can also provide all the components necessary for the extrinsic thrombin formation.

Original languageEnglish
Pages (from-to)850-855
Number of pages6
JournalThrombosis and Haemostasis
Issue number3
Publication statusPublished - jan. 1 1989


ASJC Scopus subject areas

  • Hematology

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