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

Phase 2

Completed

• Conditions: Parkinson's Disease

• Registration Number: NCT00199355
• Lead Sponsor: Kyowa Kirin Co., Ltd.

Brief Summary

To establish the efficacy of 20 mg/day and 40 mg/day doses 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 20 mg/d and 40mg/d doses 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 1:1:1 ratio to double blind treatment with oral doses of 20 or 40mg/d 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.

Study Timeline

• Study Start: 2005-04
• Study First Submitted: 2005-09-12
• Study First Submitted QC: 2005-09-12
• Study First Posted: 2005-09-20
• Primary Completion: 2006-03
• Study Completion: 2006-03
• Status Verified: 2012-08
• Last Update Submitted: 2014-05-21
• Last Update Posted: 2014-05-23

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 75

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/DCI for at least one year, stable dose in past 4 weeks.
4. Currently take at least three doses of levodopa/DCI 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 120 minutes of OFF time on two 24 hour diaries.
8. On a stable regimen of medications being administered within normal therapeutic limits for Parkinson's disease for at least four weeks before randomization.
9. Be at least 30 years of age.

Exclusion Criteria

1. Neurosurgical treatment for PD.
2. History of psychosis.
3. Diagnosis of atypical Parkinsonism or secondary Parkinsonism variant.
4. Diagnosis of cancer within 5 years.
5. Diagnosis of clinically significant illness of any organ system.
6. Mini-mental status examination score of 25 or less.
7. Taking any excluded medications.
8. History of drug or alcohol abuse or dependence within the past two years.
9. History of seizures or neurological malignant syndrome.
10. Clinical depression.
11. Pregnant or lactating females.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
To establish the efficacy of 20 mg/d and 40mg/d doses of istradefylline for reducing the percentage of OFF time in patients with advanced Parkinson's disease (PD) treated with levodopa/DCI.

Secondary Outcome Measures

Name	Time	Method
To evaluate the efficacy of 20 mg/d and 40mg/d dose of istradefylline for reducing the total hours of OFF time.
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 Unified Parkinson's Disease Rating Scale (UPDRS).
To evaluate the safety of 20 mg/d and 40mg/d doses of istradefylline.
To evaluate change in the Clinical Global Impression - Severity of Illness scale (CGI-S).
To evaluate change in the Clinical Global Impression - Improvement scale (CGI-I).