A Four-Week Multicenter Study Evaluating the Safety and Efficacy of Gefapixant (AF-219/MK-7264) in Subjects With Osteoarthritis of the Knee

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01554579
Recruitment Status : Completed
First Posted : March 15, 2012
Results First Posted : March 1, 2017
Last Update Posted : May 17, 2017
Information provided by (Responsible Party):
Afferent Pharmaceuticals, Inc.

Brief Summary:

The purpose of this study is to assess the efficacy of a single dose level of gefapixant (AF-219/MK-7264) in subjects with moderate to severe pain associated with osteoarthritis (OA) of the knee compared with placebo after 4 weeks of treatment.

The study will also assess the safety and tolerability, changes in physical function, stiffness, treatment response and health outcomes.

Condition or disease Intervention/treatment Phase
Osteoarthritis of the Knee Drug: Gefapixant Drug: Sugar Pill Phase 2

Detailed Description:

Subjects who satisfy entry criteria at Screening will enter the Washout Phase, discontinuing their current nonsteroidal anti-inflammatory drug (NSAID) therapy.

Up to 220 subjects who fulfill flare (and other entry) criteria will be randomized to gefapixant or placebo.

Subjects will complete Treatment Visits 1, 2, 3, and 4 weeks after starting study drug. At each Treatment Visit, subjects will undergo efficacy assessments and safety procedures. During the Washout and Treatment Phases subjects will complete the 'average pain' Numeric Pain Rating Scale (NPRS) and count of rescue medication used for the preceding 24 hours.

Subjects will return 2 weeks after their last Treatment Visit (for a Follow-Up Visit).

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 171 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Actual Study Start Date : March 31, 2012
Actual Primary Completion Date : November 30, 2013
Actual Study Completion Date : November 30, 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Osteoarthritis

Arm Intervention/treatment
Placebo Comparator: Sugar pill Drug: Sugar Pill

Experimental: Gefapixant Drug: Gefapixant
Other Names:
  • AF-219
  • MK-7264

Primary Outcome Measures :
  1. The Primary Efficacy Endpoint of This Study is the Weekly Average Daily NPRS (Average Pain) [ Time Frame: 2 Weeks ]
    Subjects were instructed to select a number on a scale that best described their knee arthritis pain during the past 24 hours. The scale was between 0 and 10 where 0 was no pain and 10 was the worst possible pain. The scale was completed by telephone (an interactive voice response system [IVRS]) every evening before bedtime.

Secondary Outcome Measures :
  1. WOMAC Scores [ Time Frame: 4 Weeks ]
    This is the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). This is a questionnaire that asks subjects to evaluate their pain, stiffness, and physical activities affecting their knee over the past 48 hours. Subjects evaluate their pain, stiffness and physical activities by selecting a number between 0 and 10 where 0 is no pain/no stiffness/no difficulty doing physical activities and 10 is extreme pain/extreme stiffness/extreme difficulty doing physical activities. The questionnaire was administered at Screening, Baseline and at the end of Week 4 by telephone (an interactive voice response system [IVRS]) before bedtime. The scores for each category are totaled (range is 0-100). A lower total score means less pain and a higher total score means greater pain.

  2. SF-36 [ Time Frame: 4 Weeks ]
    The SF-36 (acute version 2) was a 36 question survey administered at Baseline and at the end of study or early termination (Week 4). The questionnaire contained numerous domain scores to evaluate physical function, mental function, general health, bodily pain, social functioning and vitality. The question of interest for the analysis was question #1 regarding walking pain. Scores range from 0 - 100. A lower score means decreased pain while walking and a higher score means increased pain while walking.

Information from the National Library of Medicine

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Ages Eligible for Study:   40 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Men or women
  • Women of child bearing potential must not be pregnant during the study and must use two forms of birth control
  • Men and their female partners must use two forms of birth control
  • Clinical and radiographic evidence of chronic knee osteoarthritis
  • An average NPRS score of >=5 and <=9 over a 4-7 day washout period of their previous osteoarthritis medications
  • Ambulatory
  • Have provided written informed consent

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01554579

  Hide Study Locations
United States, Arizona
Afferent Investigative Site
Phoenix, Arizona, United States, 85018
Afferent Investigative Site
Phoenix, Arizona, United States, 85027
United States, California
Afferent Investigative Site
San Diego, California, United States, 92108
United States, Florida
Afferent Investigative Site
Clearwater, Florida, United States, 33756
Afferent Investigative Site
Orlando, Florida, United States, 32806
Afferent Investigative Site
Pinellas Park, Florida, United States, 33781
United States, Georgia
Afferent Investigative Site
Atlanta, Georgia, United States, 30329
United States, Kansas
Afferent Investigative Site
Wichita, Kansas, United States, 67203
United States, Massachusetts
Afferent Investigative Site
New Bedford, Massachusetts, United States, 02740
Afferent Investigative Site
Watertown, Massachusetts, United States, 02472
United States, Michigan
Afferent Investigative Site
Troy, Michigan, United States, 48098
United States, Mississippi
Afferent Investigative Site
Olive Branch, Mississippi, United States, 38654
United States, Missouri
Afferent Investigative Site
Hazelwood, Missouri, United States, 63042
Afferent Investigative Site
St. Louis, Missouri, United States, 63141
United States, New Mexico
Afferent Investigative Site
Albuquerque, New Mexico, United States, 87102
United States, North Carolina
Afferent Investigative Site
Asheville, North Carolina, United States, 28803
Afferent Investigative Site
Greensboro, North Carolina, United States, 27408
Afferent Investigative Site
Winston Salem, North Carolina, United States, 27103
United States, Ohio
Afferent Investigative Site
Cincinnati, Ohio, United States, 45219
Afferent Investigative Site
Toledo, Ohio, United States, 43623
United States, Oregon
Afferent Investigative Site
Medford, Oregon, United States, 97504
United States, Pennsylvania
Afferent Investigative Site
Duncansville, Pennsylvania, United States, 16635
United States, Rhode Island
Afferent Investigative Site
Warwick, Rhode Island, United States, 02886
United States, South Carolina
Afferent Investigative Site
Greer, South Carolina, United States, 29650
Afferent Investigative Site
Mount Pleasant, South Carolina, United States, 29464
United States, Texas
Afferent Investigative Site
Austin, Texas, United States, 78705
Afferent Investigative Site
Dallas, Texas, United States, 75231
Afferent Investigative Site
Houston, Texas, United States, 77062
Afferent Investigative Site
San Antonio, Texas, United States, 78209
Afferent Investigative Site
San Antonio, Texas, United States, 78229
United States, Utah
Afferent Investigative Site
Clinton, Utah, United States, 84015
United States, Virginia
Afferent Investigative Site
Roanoke, Virginia, United States, 24018
United States, Washington
Afferent Investigative Site
Renton, Washington, United States, 98057
United States, Wisconsin
Afferent Investigative Site
Kenosha, Wisconsin, United States, 53142
Sponsors and Collaborators
Afferent Pharmaceuticals, Inc.

Responsible Party: Afferent Pharmaceuticals, Inc. Identifier: NCT01554579     History of Changes
Other Study ID Numbers: 7264-004
AF219004 ( Other Identifier: Afferent Pharmaceuticals )
First Posted: March 15, 2012    Key Record Dates
Results First Posted: March 1, 2017
Last Update Posted: May 17, 2017
Last Verified: April 2017

Additional relevant MeSH terms:
Osteoarthritis, Knee
Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases