 8. Subject must meet the Diagnostic and Statistical Manual of Mental Disorders Fourth Edition; Text Revision DSM-IV-TR criteria for a primary diagnosis of schizophrenia with the following subtypes: disorganized 295.10, catatonic type 295.20, paranoid 295.30, residual 295.60, or undifferentiated 295.90; and in the opinion of the Investigator has been clinically stable for the past 6 months. 