- Patients with history of thrombotic episodes such as deep venous thrombosis, pulmonary embolus, MI, or CVA occurring more than 12 months prior to enrollment may be considered for protocol participation provided that they are on stable doses of anticoagulant therapy. Similarly, patients anticoagulated for atrial fibrillation or other conditions may participate provided that they are on stable dose of anticoagulant therapy. Clinicians must note the higher risk of bevacizumab therapy amongst patients with history of thromboembolic disorders and consideration for participation is at the discretion of the treating physician.