Abstract
Deep venous thrombosis and pulmonary embolism are well-recognized complications of cancer, especially in patients with a venous access device or receiving chemotherapy. The pathogenic mechanisms of thrombosis in cancer patients involve a complex interaction between the patient's tumor cells and hemostatic system. Chemotherapy and central venous catheters increase the risk of thromboembolism. Prophylactic treatment for these patients remains controversial. We conducted a systematic literature review using the Medline database and abstract books for meetings of the American Society of Clinical Oncology and the American Society of Hematology since 2000. Our search focused on clinical trials of primary prevention of venous catheter-related thrombosis or prevention of chemotherapy-related venous thromboembolism in cancer patients. Ten studies evaluating primary prevention of patients with central catheters were identified, and their results are contradictory. Currently only one study has examined prevention of chemotherapy-related venous thromboembolism, in women with metastatic breast cancer. Its results cannot be extrapolated to other tumors. Systematic prophylaxis cannot yet be recommended. In the near future we must improve our knowledge of the risk factors of these complications. Prophylaxis should be individualized for each patient. New anticoagulant drugs should be tested in cancer patients.
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