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Acute leukemia is associated more often with hemorrhage than with venous thromboembolism (VTE). However, leukemic blasts can release procoagulant microparticles and elicit production of thrombogenic cytokines, and leukemia patients can be exposed to potential risk factors for VTE, including chemotherapy, hospitalization, and insertion of central venous catheters (CVCs). As a result, risk for VTE associated with acute leukemia might be as high as that with other cancers. Now, investigators have used data from the California Cancer Registry and the Patient Discharge Database to assess VTE incidence in patients who received diagnoses of acute myelogenous leukemia (AML) or acute lymphoblastic leukemia (ALL) between 1993 and 1999 (before outpati…