The relationship between cancer and abnormalities of blood coagulation
has been recognized for well over a century. Deep venous thrombosis o
f the lower extremities is most common, but pulmonary embolism, upper
extremity vein thrombosis, disseminated intravascular coagulation, and
other, more unusual, dinical events may occur. Chemotherapy also has
been linked to thrombotic episodes. Anticoagulant therapy is appropria
te in many patients with venous or arterial thrombosis. Prophylaxis of
venous thrombosis is particularly important in hospitalized cancer pa
tients who are at bed rest or undergoing surgery.