Management of Cancer-associated Thrombosis (CAT): Symptomatic or Incidental.

Background: Cancer-associated thrombosis (CAT), the second leading cause of death in patients with cancer can be treated with low molecular weight heparin (LMWH) according to guidelines. Patients and Methods: A multicenter prospective observational study was carried out to record antithrombotic treatment practice, assess thrombosis recurrence and bleeding, and identify potential risk factors. Adult patients from 18 Oncology Departments throughout Greece were followed-up for 12 months. Results: A total of 120 patients with CAT receiving anticoagulant treatment were enrolled (35% incidental); 85% were treated for more than 6 months, 95.8% were treated with tinzaparin and smaller percentages with other agents. Thrombosis recurred in three patients and there was minor bleeding in four patients. Bleeding was associated with high body mass index (>35 kg/m(2)), trauma history, renal insufficiency and bevacizumab use. Conclusion: Incidental thrombosis contributes significantly to CAT burden. Long-term use of LMWH seems to be effective and safe. Several risk factors associated with bleeding should be considered during anti-coagulation therapy planning.