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In an attempt to clarify the conflicting reports of plasminogen activator and lack of fibrinolytic activity in tumor tissues, the fibrinolytic activity of 62 metastatic tumors and 5 tumor thrombi from autopsy and biopsy specimens was studied by the fibrin slide technique. Metastatic tumors involved lymph nodes, liver, lung, brain and ovary. Tumor thrombi were mainly comprised of hepatoma thrombi in branches of either hepatic or portal veins.  The lack of fibrinolytic activity was graded according to the focal lysis time of vascular tissues within the tumor and in the case of lymphnodes, lymphatic channels. A complete lack of fibrinolytic activity was observed in metastatic tumors and tumor thrombi, a finding similar to that observed in primary tumors.  Immunofluorescent studies on the tumors revealed the presence of antigenic material identical to fibrin, platelets and alpha2 plasmin inhibitor.

Fibrinolytic Activity In Metastatic Tumors And Tumor Thrombi