Uncontrolled hypertension, myocardial infarction, unstable angina New York Heart Association (NYHA) Grade II or greater congestive heart failure History of any cardiac arrhythmia requiring medication (irrespective of its severity) Grade II or greater peripheral vascular disease A history of additional risk factors for TdP (e.g., heart failure, hypokalemia, family history of Long QT Syndrome); Positive blood test for HIV, HBV and HCV; Identification of viral DNA by quantitative PCR for EBV (Ebstein Barr virus), JC virus, CMV (Cytomegalovirus) and Herpes Zoster; History of other disease, metabolic dysfunction, physical examination finding, or clinical laboratory finding giving reasonable suspicion of a disease or condition that contraindicates use of an investigational drug or that might affect interpretation of the results of the study or render the subject at high risk from treatment complications;