- The participant must have adequate coagulation function as defined by International Normalized Ratio (INR) ≤ 1.8 and a partial thromboplastin time (PTT) ≤ 1.5 X ULN. Participants on full-dose anticoagulation must be on a stable dose of oral anticoagulant or low molecular weight (LMW) heparin and if on warfarin must have a INR between 2 and 3 and have no active bleeding or pathological condition that carries a high risk of bleeding (for example, tumor involving major vessels or known varices)