A Study of Istradefylline (KW-6002) for the Treatment of Parkinson's Disease in Patients Taking Levodopa

Phase 3

Completed

• Conditions: Parkinson's Disease

• Registration Number: NCT00199407
• Lead Sponsor: Kyowa Kirin, Inc.

Brief Summary

To establish the efficacy of a 20 mg/day dose of istradefylline for reducing the percentage of OFF time in patients with advanced Parkinson's disease (PD) treated with levodopa.

Detailed Description

To establish the efficacy of a 20 mg/d dose of istradefylline for reducing the percentage of OFF time in patients with advanced Parkinson's disease (PD) treated with levodopa. Patients who meet entry criteria will be randomized in a 1 to 1 ratio to either istradefylline or matching placebo. Patients will be treated for 12 weeks and will have interim visits and end of treatment visit to assess the efficacy and safety of istradefylline as compared to placebo.

Study Timeline

• Study Start: 2004-06
• Study First Submitted: 2005-09-12
• Study First Submitted QC: 2005-09-13
• Study First Posted: 2005-09-20
• Primary Completion: 2005-11
• Study Completion: 2006-01
• Status Verified: 2024-04
• Last Update Submitted: 2024-04-23
• Last Update Posted: 2024-04-25

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 230

Inclusion Criteria

1. UK Parkinson's Disease Society (UKPDS) brain bank criteria (Step 1 and 2) for PD.
2. PD stages 2-4 in the OFF state for Modified Hoehn and Yahr Scale.
3. On levodopa/carbidopa for at least one year, stable dose in past 4 weeks.
4. Currently take at least three doses of levodopa/carbidopa per day.
5. Predictable end of dose wearing off.
6. Able to satisfactorily complete Hauser version of a Parkinson's diary.
7. Have an average of 180 minutes of OFF time on two 24 hour diaries.
8. Be at least 30 years of age.

Exclusion Criteria

1. Neurosurgical treatment for PD.
2. History of psychosis.
3. Diagnosis of atypical parkinsonism, secondary parkinsonism variant or Parkinson's plus syndromes.
4. Diagnosis of cancer within 5 years.
5. Mini-mental status examination score of 25 or less.
6. History of seizures or neurologic malignant_syndrome.
7. Clinical depression.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
To establish the efficacy of a 20 mg/d dose of istradefylline for reducing the percentage of OFF time in patients with advanced Parkinson's disease (PD) treated with levodopa/carbidopa.

Secondary Outcome Measures

Name	Time	Method
To evaluate the change in percentage of ON time (without dyskinesia, with dyskinesia, with non-troublesome dyskinesia, and with troublesome dyskinesia).
To evaluate the change in Parkinson's Disease Questionnaire (PDQ-39) and Medical Outcomes Study 36-item Short Form (SF-36).
To evaluate the change in the Patient Global Impression - Improvement scale (PGI-I).
To evaluate change in the Clinical Global Impression - Severity of Illness scale (CGI-S).
To evaluate the safety of a 20 mg/d dose of istradefylline.
To evaluate the efficacy of a 20 mg/d dose of istradefylline for reducing the total hours of OFF time.
To evaluate the change in Unified Parkinson's Disease Rating Scale (UPDRS) Motor Examination score (part III) and/or in Activities of Daily Living (ADL) score (part II).

Trial Locations

Locations (1)

Kyowa Pharmaceutical Inc.; 🇺🇸 Princeton, New Jersey, United States