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Venous thromboembolism (VTE)

aka VTE, thromboembolism, venous thromboembolism, thromboembolic events, thromboembolic, thrombosis, thrombotic events, deep vein thrombosis, DVT, pulmonary embolism, blood clots, blood clot, anticoagulation, anticoagulant, thromboprophylaxis, low-molecular-weight heparin, LMWH, DOAC, DOACs, Khorana score, arterial thromboembolism

Blood clots in the leg veins or lungs. Cancer makes blood clot more easily and some treatments (IMiDs, anti-VEGF drugs, hormone therapy, central lines, surgery) add risk; clots are the second commonest cause of death in cancer patients after the cancer itself.

Cancer-associated thrombosis affects 5-20% of patients, highest in pancreatic, gastric, brain and lung cancer and myeloma; the Khorana score identifies outpatients who benefit from prophylactic apixaban or rivaroxaban (AVERT, CASSINI). Treatment is a DOAC or low-molecular-weight heparin for at least 6 months, balancing bleeding risk in gastrointestinal and urothelial tumours. Lenalidomide and thalidomide mandate aspirin or anticoagulant prophylaxis; bevacizumab and other VEGF inhibitors raise arterial events; tamoxifen and erythropoiesis-stimulating agents raise venous ones. Incidental pulmonary emboli on staging CTs are common and are treated as symptomatic ones.

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