A Long-Term, Safety Study With a Flexible Dose Range of KW-6002 in Patients With Motor Response Complications on Levodopa/Carbidopa Therapy

Inclusion Criteria: Eligible subjects were: * male or female * at least 30 years of age * had completed participation in a prior double-blind istradefylline trial * met United Kingdom's Parkinson's Disease Society (UKPDS) brain bank criteria (Step 1 and Step 2) for Parkinson's disease and the severity of the Parkinson's disease was defined as Stages 2-4 on the Modified Hoehn and Yahr Scale while in the OFF state * had been treated with levodopa for at least 1 year * had been on a stable Parkinson's disease regimen within normal therapeutic ranges including levodopa for at least 4 weeks before Baseline * were currently taking at least 4 doses of levodopa per day (3 doses per day if at least 2 doses contained slow-release formulation) * had predictable end-of-dose wearing-off Exclusion Criteria: * none