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lüll Inhibition of metastases by anticoagulants Hejna M; Raderer M; Zielinski CCJ Natl Cancer Inst 1999[Jan]; 91 (1): 22-36Metastasis involves several distinct steps, including one in which the tumor cell, after entry into the bloodstream, comes to rest in a capillary located at the distant site where a metastatic tumor will ultimately form. Components of the blood-clotting pathway may contribute to metastasis by trapping cells in capillaries or by facilitating adherence of cells to capillary walls. Conceivably, anticoagulants could interfere with this step in the metastatic process. In this review, we have summarized current knowledge on the interaction of malignant cells, clotting factors, and anticoagulants. We used computerized (MEDLINE) and manual searches to identify studies done in humans, in animals, and in in vitro systems that were published in English between 1952 and 1998. We found many reports that the formation of metastatic tumors could be inhibited by heparin, a vitamin K antagonist (warfarin), and inhibitors of platelet aggregation (prostacyclin and dipyridamole). Despite these encouraging preliminary results and a compelling biochemical rationale, only limited information exists on the clinical use of anticoagulants for the prevention or treatment of metastatic cancer because there have been so few controlled and prospectively randomized studies on this topic. In view of the preliminary results, anticoagulants may hold promise for the prevention and treatment of metastases. We believe that larger controlled investigations are strongly warranted to evaluate the clinical potential of anticoagulants for the prevention and treatment of metastases in humans.|Animals[MESH]|Anticoagulants/pharmacology/*therapeutic use[MESH]|Clinical Trials as Topic[MESH]|Colorectal Neoplasms/drug therapy/pathology[MESH]|Drug Evaluation[MESH]|Drug Screening Assays, Antitumor[MESH]|Fibrinolytic Agents/pharmacology/therapeutic use[MESH]|Humans[MESH]|Lung Neoplasms/drug therapy/pathology[MESH]|Neoplasm Metastasis/drug therapy/*prevention & control[MESH]|Platelet Aggregation Inhibitors/pharmacology/therapeutic use[MESH] |