Phase 3 Study of Pexidartinib for Pigmented Villonodular Synovitis (PVNS) or Giant Cell Tumor of the Tendon Sheath (GCT-TS) (ENLIVEN)

April 11, 2022 updated by: Daiichi Sankyo, Inc.

A Double-blind, Randomized, Placebo-controlled Phase 3 Study of Orally Administered PLX3397 in Subjects With Pigmented Villonodular Synovitis or Giant Cell Tumor of the Tendon Sheath

This is a Phase 3 clinical study, which aims to evaluate the effectiveness of an investigational drug called pexidartinib for the treatment of certain tumors for which surgical removal could cause more harm than good.

The main purpose of this study is to gather information about the investigational drug pexidartinib, which may help to treat tumors of pigmented villonodular synovitis (PVNS) or giant cell tumor of the tendon sheath (GCT-TS).

The study consists of two parts with a follow-up period. In Part 1, eligible study participants will be assigned to receive either pexidartinib or matching placebo for 24 weeks. A number of assessments will be carried out during the course of the study, including physical examinations, blood tests, imaging studies, electrocardiograms, and questionnaires. MRI scans will be used to evaluate the response of the tumors to the treatment. Some subjects, assigned to placebo in Part 1 transitioned to pexidartinib for Part 2.

Then a protocol amendment was written to allow only pexidartinib patients to continue into Part 2. Part 2 is a long-term treatment phase in which all participants receive open-label pexidartinib. There was also a follow-up period added to Part 2.

Study Overview

Study Type

Interventional

Enrollment (Actual)

120

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

    • New South Wales
      • Sydney, New South Wales, Australia, 2050
        • Chris O'Brien Lifehouse
    • Queensland
      • Woolloongabba, Queensland, Australia, 4102
        • Princess Alexandra Hospital
    • Victoria
      • East Melbourne, Victoria, Australia, 3000
        • Peter Maccallum Cancer Centre
    • Ontario
      • Toronto, Ontario, Canada, M5G2M9
        • Princess Margaret Hospital
    • Quebec
      • Montreal, Quebec, Canada, H4A3J1
        • McGill University Health Centre
      • Herlev, Denmark, 2730
        • Herlev Hospital
      • Lyon, France, 69373
        • Centre Léon Bérard
      • Villejuif, France, 94800
        • Institut Gustave Roussy
      • Berlin, Germany, 13125
        • Helios Klinikum Berlin-Buch
      • Essen, Germany, 45147
        • Universitätsklinikum Essen
      • Budapest, Hungary, H1134
        • Military Hospital-State Health Center
    • BO
      • Bologna, BO, Italy, 40136
        • Istituto Ortopedico Rizzoli
    • MI
      • Milano, MI, Italy, 20133
        • Istituto Nazionale Tumori-Fondazione IRCCS
      • Leiden, Netherlands, 2333 ZA
        • Leiden University Medical Center
      • Nijmegen, Netherlands, 6525 GA
        • Radboud Univ. Medical Center
      • Warszawa, Poland, 02-781
        • Centrum Onkologii-Instytut im. Marii Skłodowskiej-Curie
      • Barcelona, Spain, 08041
        • Hospital de La Santa Creu I Sant Pau
      • Sevilla, Spain, 41013
        • Hospital Universitario Virgen Del Rocio
      • London, United Kingdom, SW36JJ
        • The Royal Marsden NHS Foundation Trust
      • London, United Kingdom, NW12BU
        • University College Hospital
    • Arizona
      • Scottsdale, Arizona, United States, 85259-5499
        • Mayo Clinic
    • California
      • Los Angeles, California, United States, 90033
        • University of Southern California
      • Palo Alto, California, United States, 94305
        • Stanford Cancer Center
      • Santa Monica, California, United States, 90404
        • UCLA Medical Center
    • Florida
      • Jacksonville, Florida, United States, 32224
        • Mayo Clinic Cancer Center
      • Miami, Florida, United States, 33136
        • Sylvester Comprehensive Cancer Center
      • Tampa, Florida, United States, 33612
        • Moffitt Cancer Center
    • Massachusetts
      • Boston, Massachusetts, United States, 02114
        • Massachusetts General Hospital
      • Boston, Massachusetts, United States, 02115
        • : Dana Farber Cancer Institute
    • Michigan
      • Ann Arbor, Michigan, United States, 48109
        • Michigan Comprehensive Cancer Center
    • Minnesota
      • Rochester, Minnesota, United States, 55905
        • Mayo Clinic Cancer Center
    • Missouri
      • Saint Louis, Missouri, United States, 63110
        • Washington University School of Medicine
    • New Jersey
      • Camden, New Jersey, United States, 08103
        • MD Anderson Cancer Center at Cooper
    • New York
      • New York, New York, United States, 10065
        • Memorial Sloan Kettering Cancer Center
    • North Carolina
      • Durham, North Carolina, United States, 27710
        • Duke Cancer Center
    • Oregon
      • Portland, Oregon, United States, 97239
        • OHSU Knight Cancer Institute
    • Tennessee
      • Nashville, Tennessee, United States, 37232
        • Vanderbilt-Ingram Cancer Center
    • Utah
      • Salt Lake City, Utah, United States, 84112
        • Huntsman Cancer Institute
    • Washington
      • Seattle, Washington, United States, 98109
        • Seattle Cancer Care Alliance

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria

  1. Age ≥ 18 years.
  2. A diagnosis of PVNS or GCT-TS (i) that has been histologically confirmed either by a pathologist at the treating institution or a central pathologist, and (ii) where surgical resection would be associated with potentially worsening functional limitation or severe morbidity (locally advanced disease), with morbidity determined consensually by qualified personnel (eg, two surgeons or a multi-disciplinary tumor board).
  3. Measurable disease of at least 2 cm and otherwise based on RECIST 1.1, assessed from MRI scans by a central radiologist.
  4. Symptomatic disease because of active PVNS or GCT-TS, defined as one or more of the following:

    1. a worst pain of at least 4 at any time during the week preceding the Screening Visit (based on scale of 0 to 10, with 10 representing "pain as bad as you can imagine").
    2. a worst stiffness of at least 4 at any time during the week preceding the Screening Visit (based on a scale of 0 to 10, with 10 representing "stiffness as bad as you can imagine").
  5. Stable prescription of analgesic regimen during the 2 weeks prior to randomization.
  6. During the 2 weeks prior to randomization, at least 4 of 7 consecutive days of Brief Pain Inventory (BPI) Worst Pain Numeric Rating Scale (NRS) items and Worst Stiffness NRS items completed correctly.
  7. Women of childbearing potential must have a negative serum pregnancy test within the 14-day period prior to randomization. (Where demanded by local regulations, this test may be required within 72 hours of randomization.)
  8. Males and females of childbearing potential are permitted in the study so long as they consent to avoid getting their partner pregnant or becoming pregnant, respectively, by using a highly effective contraception method, as described below, throughout the study and for up to 90 days after completion. Highly effective methods of contraception include: intra-uterine device (non-hormonal or hormonal), bilateral tubal occlusion, vasectomy, sexual abstinence, or barrier methods (eg, condom, diaphragm) used in combination with hormonal methods associated with inhibition of ovulation. Women of non-childbearing potential may be included if they are either surgically sterile or have been postmenopausal for ≥ 1 year. Women who have documentation of at least 12 months of spontaneous amenorrhea and have a follicle stimulating hormone (FSH) level > 40 milli-International units (mIU/mL) will be considered postmenopausal.
  9. Adequate hematologic, hepatic, and renal function, defined by:

    • Absolute neutrophil count ≥ 1.5 × 10^9/L
    • aspartate aminotransferase/alanine (AST/ALT) ≤ 1.5 × upper limit of normal (ULN)
    • Hemoglobin > 10 g/dL
    • Total bilirubin ≤ 1.5 × ULN
    • Platelet count ≥ 100 × 10^9/L
    • Serum creatinine ≤ 1.5 × ULN
  10. Willingness and ability to complete the Worst Pain NRS item, Worst Stiffness NRS item, Patient-reported Outcomes Measurement Information System (PROMIS) Physical Function Scale, and other self-assessment instruments throughout the study.
  11. Willingness and ability to use an electronic diary.
  12. Willingness and ability to provide written informed consent prior to any study-related procedures and to comply with all study requirements.

Exclusion Criteria

  1. Investigational drug use within 28 days of randomization.
  2. Previous use of pexidartinib or any biologic treatment targeting CSF-1 or the CSF-1R; previous use of oral tyrosine kinase inhibitors, eg, imatinib or nilotinib, are allowed.
  3. Active cancer (either concurrent or within the last year of starting study treatment) that requires therapy (eg, surgical, chemotherapy, or radiation therapy), with the exception of adequately treated basal or squamous cell carcinoma of the skin, melanoma in-situ, carcinoma in-situ of the cervix or breast, or prostate carcinoma with a prostate-specific antigen value <0.2 ng/mL.
  4. Known metastatic PVNS/GCT-TS.
  5. Active or chronic infection with hepatitis C virus (HCV) or hepatitis B virus or known active or chronic infection with human immunodeficiency virus.
  6. Known active tuberculosis.
  7. Significant concomitant arthropathy in the affected joint, serious illness, uncontrolled infection, or a medical or psychiatric history that, in the Investigator's opinion, would likely interfere with the person's study participation or the interpretation of his or her results.
  8. Women who are breastfeeding.
  9. A screening Fridericia corrected QT interval (QTcF) ≥ 450 ms (men) or ≥ 470 ms (women).
  10. MRI contraindications.
  11. History of hypersensitivity to any excipients in the investigational product.
  12. Inability to swallow capsules.

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: Crossover Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Part 1 - Pexidartinib
Participants received blinded treatment of pexidartinib,1000 mg (5 capsules per day ) for 2 weeks, then 800 mg (4 capsules per day) for 22 weeks
Each capsule contains 200 mg of pexidartinib for oral administration
Other Names:
  • PLX3397
  • Pexidartinib hydrochloride (HCl)
Placebo Comparator: Part 1 - Placebo
Participants received blinded treatment of matching placebo (5 capsules per day) for 2 weeks, then matching placebo (4 capsules per day) for 22 weeks
Placebo capsule matching pexidartinib capsule for oral administration
Other Names:
  • Placebo Capsule
Experimental: Part 2 - All Pexidartinib
Participants received pexidartinib in Part 1 and in Part 2 at their prescribed dose
Each capsule contains 200 mg of pexidartinib for oral administration
Other Names:
  • PLX3397
  • Pexidartinib hydrochloride (HCl)
Experimental: Part 2 - Placebo-Pexidartinib
Participants received placebo in Part 1 and pexidartinib in Part 2 at their prescribed dose
Each capsule contains 200 mg of pexidartinib for oral administration
Other Names:
  • PLX3397
  • Pexidartinib hydrochloride (HCl)
Placebo capsule matching pexidartinib capsule for oral administration
Other Names:
  • Placebo Capsule

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Percentage of Participants With Symptomatic, Locally Advanced Tenosynovial Giant Cell Tumor (TGCT) Achieving Complete or Partial Response to Pexidartinib Compared With That of Placebo Per Response Evaluation Criteria in Solid Tumors Version 1.1 at Week 25
Time Frame: Week 25
Complete response (CR) and partial responses (PR) were assessed based on centrally-read magnetic resonance imaging (MRI) scans and Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST 1.1). A CR was defined as disappearance of all tumors and a PR was defined as at least a 30% decrease in the sum of diameters of target tumors using the baseline sum diameters as the reference.
Week 25

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Mean Change From Baseline For Range of Motion (ROM) Score in Participants Receiving Pexidartinib Compared With Those on Placebo Up to Week 25
Time Frame: Baseline, Week 13, and Week 25
Range of motion (ROM) of the joint was assessed by a qualified, independent, and blinded or third-party assessors at the clinical site. Measurements were recorded in degrees. At baseline, the plane of movement with the smallest relative value (worst) was identified and this plane was used for evaluating the relative change of motion subsequently. Only the plane with the worst impaired ROM at baseline was selected for subsequent analyses.
Baseline, Week 13, and Week 25
Percentage of Participants With Symptomatic, Locally Advanced Tenosynovial Giant Cell Tumor (TGCT) Achieving Complete or Partial Response Based on Tumor Volume Score (TVS) After Receiving Pexidartinib Compared With Those on Placebo at Week 25
Time Frame: Week 25
Complete response (CR) and partial response (PR) were assessed using tumor volume score (TVS). A CR was defined as disappearance of all tumors and a PR was defined as at least a 30% decrease in the sum of diameters of target tumors using the baseline sum diameters as the reference. TVS is a semi-quantitative MRI scoring system that describes tumor mass and is based on 10% increments of the estimated volume of the maximally distended synovial cavity or tendon sheath involved. A tumor that is equal in volume to that of a maximally distended synovial cavity or tendon sheath was scored 10; a score of 0 indicated no evidence of tumor.
Week 25
Mean Change From Baseline in the Patient-reported Outcomes Measurement Information System (PROMIS) Physical Function Score in Participants Receiving Pexidartinib Compared With Those on Placebo Up to Week 25
Time Frame: at Week 9 , Week 17, and Week 25
The Patient-reported Outcomes Measurement Information System (PROMIS) physical function scale was used to assess physical function of the upper and lower limbs. The scale ranged from 1 defined as 'unable to do' or 'cannot do' to 5 defined as 'without any difficulty' or 'not at all', where higher scores represent better outcomes.
at Week 9 , Week 17, and Week 25
Mean Change From Baseline for Worst Stiffness Numeric Rating Scale Score (NRS) in Participants Receiving Pexidartinib Compared With Those on Placebo Up to Week 25
Time Frame: Baseline, Week 9, Week 17, and Week 25
The Worst Stiffness Numeric Rating Scale (NRS) was a 1-item, self-administered questionnaire assessing the "worst" stiffness in the last 24 hours. The NRS for this item ranged from 0 (no stiffness) to 10 (stiffness as bad as you can imagine).
Baseline, Week 9, Week 17, and Week 25
Percentage of Participants Who Responded With a Decrease of at Least 30% in the Mean Brief Pain Inventory Worst Pain Numeric Rating Scale Score Among Participants Receiving Pexidartinib Compared With Those on Placebo at Week 25
Time Frame: Week 25
The Brief Pain Inventory (BPI) Worst Pain Numeric Rating Scale Score (NRS) was a 1-item, self-administered questionnaire assessing the "worst" pain in the last 24 hours. The NRS for this item ranged from 0 (no pain) to 10 (pain as bad as you can imagine).
Week 25
Number of Responders to Pexidartinib With and Without Disease Progression
Time Frame: By Week 96
Duration of response (DOR) based on RECIST 1.1 is defined as the date of the first recorded response to the first date of documented disease progression. The overall number of responses and the number of participants with and without disease progression was assessed.
By Week 96
Number of Responders to Pexidartinib With and Without Disease Progression Based on Tumor Volume Score
Time Frame: By Week 120
Tumor Volume Score (TVS) is a semi-quantitative MRI scoring system that describes tumor mass and is based on 10% increments of the estimated volume of the maximally distended synovial cavity or tendon sheath involved. A tumor that is equal in volume to that of a maximally distended synovial cavity or tendon sheath was scored 10; a score of 0 indicated no evidence of tumor. The overall number of responses and the number of participants with and without disease progression was assessed.
By Week 120
Duration of Response (DOR) Based on RECIST 1.1
Time Frame: Date of first documentation of objective response up to date of first documentation of progressive disease, assessed up to end of study (approximately 71 months)
Duration of response (DOR) based on RECIST 1.1 is defined from the date of the first recorded evidence of response to the first date of documented disease progression.
Date of first documentation of objective response up to date of first documentation of progressive disease, assessed up to end of study (approximately 71 months)
Duration of Response (DOR) Based on Tumor Volume Score (TVS)
Time Frame: Date of first documentation of objective response up to date of first documentation of progressive disease, assessed up to end of study (approximately 71 months)
Duration of response (DOR) based on TVS is defined from the date of the first recorded evidence of response to the first date of documented disease progression.
Date of first documentation of objective response up to date of first documentation of progressive disease, assessed up to end of study (approximately 71 months)
Percentage of Participants Reporting Frequent (≥10%) Treatment-Emergent Adverse Events by Preferred Term
Time Frame: After the first dose of treatment up to 28 days after the last dose
Treatment-emergent adverse events (TEAEs) were defined as adverse events that started or worsened after the first dose of treatment and within 28 days after the last dose. The National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 4.0 was used to grade adverse events. Any Grade and Grade ≥3 (severe) TEAEs are reported. TEAEs were coded using MedDRA version 17.1.
After the first dose of treatment up to 28 days after the last dose

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Percentage of Participants With Symptomatic, Locally Advanced Tenosynovial Giant Cell Tumor (TGCT) Achieving Complete or Partial Response to Pexidartinib Compared With That of Placebo Per Response Evaluation Criteria in Solid Tumors Version 1.1 by Week 49
Time Frame: By Week 49
Complete (CR) and partial responses (PR) were assessed based on centrally-read magnetic resonance imaging (MRI) scans and Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST 1.1). A CR was defined as disappearance of all tumors and a PR was defined as at least a 30% decrease in the sum of diameters of target tumors using the baseline sum diameters as the reference.
By Week 49
Mean Change From Baseline For Range of Motion (ROM) Score in Participants Receiving Pexidartinib Compared With Those on Placebo by Week 49
Time Frame: By Week 49
Range of motion (ROM) of the joint was assessed by a qualified, independent, and blinded or third-party assessors at the clinical site. Measurements were recorded in degrees. At baseline, the plane of movement with the smallest relative value (worst) was identified and this plane was used for evaluating the relative change of motion subsequently. Only the plane with the worst impaired ROM at baseline was selected for subsequent analyses.
By Week 49
Mean Change From Baseline in the Patient-reported Outcomes Measurement Information System (PROMIS) Physical Function Score in Participants Receiving Pexidartinib Compared With Those on Placebo by Week 49
Time Frame: By Week 49
The Patient-reported Outcomes Measurement Information System (PROMIS) physical function scale was used to assess physical function of the upper and lower limbs. The scale ranged from 1 defined as 'unable to do' or 'cannot do' to 5 defined as 'without any difficulty' or 'not at all', where higher scores represent better outcomes.
By Week 49
Mean Change From Baseline for Worst Stiffness Numeric Rating Scale Score (NRS) in Participants Receiving Pexidartinib Compared With Those on Placebo by Week 49
Time Frame: Baseline, Week 25, and Week 49
The Worst Stiffness Numeric Rating Scale (NRS) was a 1-item, self-administered questionnaire assessing the "worst" stiffness in the last 24 hours. The NRS for this item ranged from 0 (no stiffness) to 10 (stiffness as bad as you can imagine).
Baseline, Week 25, and Week 49
Mean Change From Baseline for Worst Pain Numeric Rating Scale Score (NRS) in Participants Receiving Pexidartinib Compared With Those on Placebo by Week 49
Time Frame: By Week 49
The Brief Pain Inventory (BPI) Worst Pain NRS was a 1-item, self-administered questionnaire assessing the "worst" pain in the last 24 hours. The NRS for this item ranged from 0 (no pain) to 10 (pain as bad as you can imagine).
By Week 49
Percentage of Participants With Symptomatic, Locally Advanced Tenosynovial Giant Cell Tumor (TGCT) Achieving Complete or Partial Response Based on Tumor Volume Score (TVS) After Receiving Pexidartinib Compared With Those on Placebo by Week 49
Time Frame: By Week 49
Best overall response (CR or PR) was assessed using tumor volume score (TVS) in the ITT population. Tumor Volume Score is a semi-quantitative MRI scoring system that describes tumor mass and is based on 10% increments of the estimated volume of the maximally distended synovial cavity or tendon sheath involved. A tumor that is equal in volume to that of a maximally distended synovial cavity or tendon sheath was scored 10; a score of 0 indicated no evidence of tumor.
By Week 49

Collaborators and Investigators

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

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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 (Actual)

May 11, 2015

Primary Completion (Actual)

March 27, 2017

Study Completion (Actual)

April 30, 2021

Study Registration Dates

First Submitted

February 19, 2015

First Submitted That Met QC Criteria

February 19, 2015

First Posted (Estimate)

February 25, 2015

Study Record Updates

Last Update Posted (Actual)

May 11, 2022

Last Update Submitted That Met QC Criteria

April 11, 2022

Last Verified

April 1, 2022

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Yes

IPD Plan Description

De-identified individual participant data (IPD) and applicable supporting clinical trial documents may be available upon request at https://vivli.org/. In cases where clinical trial data and supporting documents are provided pursuant to our company policies and procedures, Daiichi Sankyo will continue to protect the privacy of our clinical trial participants. Details on data sharing criteria and the procedure for requesting access can be found at this web address: https://vivli.org/ourmember/daiichi-sankyo/

IPD Sharing Time Frame

Studies for which the medicine and indication have received European Union (EU) and United States (US), and/or Japan (JP) marketing approval on or after 01 January 2014 or by the US or EU or JP Health Authorities when regulatory submissions in all regions are not planned and after the primary study results have been accepted for publication.

IPD Sharing Access Criteria

Formal request from qualified scientific and medical researchers on IPD and clinical study documents from clinical trials supporting products submitted and licensed in the United States, the European Union and/or Japan from 01 January 2014 and beyond for the purpose of conducting legitimate research. This must be consistent with the principle of safeguarding study participants' privacy and consistent with provision of informed consent.

IPD Sharing Supporting Information Type

  • Study Protocol
  • Statistical Analysis Plan (SAP)
  • Clinical Study Report (CSR)

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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