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

April 23, 2024 updated by: Kyowa Kirin, Inc.

A 12-week, Double Blind, Placebo-controlled, Randomized, Parallel Group, Multicenter, Fixed Dose Study to Evaluate the Efficacy and Safety of a 20 mg/d Oral Dose of KW-6002 (Istradefylline) as Treatment for Parkinson's Disease in Patients With Motor Response Complications on Levodopa/Carbidopa Therapy.

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.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

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 Type

Interventional

Enrollment

230

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • New Jersey
      • Princeton, New Jersey, United States, 08540
        • Kyowa Pharmaceutical Inc.

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

30 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

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 Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

What is the study measuring?

Primary Outcome Measures

Outcome Measure
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

Outcome Measure
To evaluate change in the Clinical Global Impression - Severity of Illness scale (CGI-S).
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).
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 percentage of ON time (without dyskinesia, with dyskinesia, with non-troublesome dyskinesia, and with troublesome dyskinesia).
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 the Patient Global Impression - Improvement scale (PGI-I).
To evaluate the safety of a 20 mg/d dose of istradefylline.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Kyowa Kirin, Inc.

Investigators

  • Study Director: Neil Sussman, MD, Kyowa Kirin, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

June 1, 2004

Primary Completion (Actual)

November 1, 2005

Study Completion (Actual)

January 1, 2006

Study Registration Dates

First Submitted

September 12, 2005

First Submitted That Met QC Criteria

September 13, 2005

First Posted (Estimated)

September 20, 2005

Study Record Updates

Last Update Posted (Actual)

April 25, 2024

Last Update Submitted That Met QC Criteria

April 23, 2024

Last Verified

April 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 6002-US-013

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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