Tenosynovial Giant Cell TumorPhase 2NCT04703322
A Study of Pexidartinib in Tenosynovial Giant Cell Tumor in Japan
A Phase 2 study testing Pexidartinib in people with Tenosynovial Giant Cell Tumor, run by Daiichi Sankyo Co., Ltd. at 6 sites in Japan.
Trial summary
This phase 2, multicenter, two-part, open-label, single-arm study will be conducted in Japan and will evaluate the safety, tolerability, pharmacokinetics (PK), and efficacy of pexidartinib in adult participants with symptomatic tenosynovial giant cell tumor (TGCT) associated with severe morbidity or functional… Read more about this study
- Who is it for?
- Ages 20 years and older
- Conditions the study is for
- Tenosynovial Giant Cell Tumor
- What is being tested?
- Pexidartinib
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 9 participants
- Where
- 6 sitesJapan
- Study dates
- 15 Mar 2021to 15 May 2026
- Phase
- Phase 2
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 20 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Age ≥20 years
- A diagnosis of TGCT (i) that has been histologically confirmed by a pathologist1 and (ii) associated with severe morbidity or functional limitations and not amenable to improvement with surgery determined consensually by qualified personnel (eg, 2 surgeons or a multi-disciplinary tumor board).
- Measurable disease as defined by RECIST version 1.1 (except that a minimal size of 2 cm is required), assessed from MRI scan by a central radiologist.
Who cannot join
- Known metastatic TGCT.
- Pre-existing increased serum transaminases; total bilirubin or direct bilirubin (>upper limit of normal); or active liver or biliary tract disease, including increased alkaline phosphatase.
- 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 a participant's study participation or the interpretation of his or her results.
- Use of strong cytochrome P450 3A inducers, including St John's wort, proton pump inhibitors and potassium-competitive acid blockers, or other products known to cause hepatotoxicity.
Trial locations and contacts
6 sites in 1 country.
6 sites in 1 country
Japan6 sites
Nagoya University Hospital
Aichi, 466-8560
Kyushu University Hospital
Fukuoka, 812-8582
Kanazawa University Hospital
Ishikawa, 920-8641
National Hospital Organization Osaka National Hospital
Osaka, 540-0006
Osaka International Cancer Institute
Osaka, 541-8567
National Cancer Center Hospital
Tokyo, 104-0045
About this study
Official title: A Phase 2, Multicenter, Two-Part, Open-Label Study of Pexidartinib in Adult Subjects With Tenosynovial Giant Cell Tumor in Japan
This phase 2, multicenter, two-part, open-label, single-arm study will be conducted in Japan and will evaluate the safety, tolerability, pharmacokinetics (PK), and efficacy of pexidartinib in adult participants with symptomatic tenosynovial giant cell tumor (TGCT) associated with severe morbidity or functional limitation and not amenable to improvement with surgery.
Read the detailed description
This study will consist of 2 parts. In Part 1, pexidartinib 800 mg/day (400 mg twice a day [BID]) will be administered on an empty stomach and tolerability and PK of pexidartinib will be evaluated to determine the initiation of Part 2. In Part 2, pexidartinib 800 mg/day (400 mg BID) will be administered on an empty stomach and efficacy, safety, and PK of pexidartinib will be evaluated.
- Conditions
- Tenosynovial Giant Cell Tumor
- Being tested
- Pexidartinib
- Keywords
- Tenosynovial Giant Cell Tumor, TGCT, Giant Cell Tumor of Tendon Sheath, GCTTS, Pigmented Villonodular Synovitis, PVNS
- Medical subject headings
- Giant Cell Tumor of Tendon Sheath, Synovitis, Pigmented Villonodular
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
PexidartinibDrug
Also called TURALIO™, PLX3397
400 mg twice daily for a total daily dose of 800 mg (each capsule contains 200 mg of pexidartinib for oral administration)
| Study group | Role | What they receive |
|---|---|---|
| Pexidartinib | Experimental | Participants with TGCT who will receive oral pexidartinib 800 mg (400 mg twice daily [BID]). Receives: Drug: Pexidartinib |
What is being measured
The primary outcome is the main question the study is designed to answer.
Dose-limiting Toxicity (DLT) in Part 1
The number of participants with any-grade DLT treatment-emergent adverse events (TEAEs) were assessed.
Measured: Cycle 1, Day 1 to Cycle 1, Day 28 (each cycle is 28 days)
Pharmacokinetic Parameter Maximum Concentration of Pexidartinib and ZAAD-1006a (Cmax) in Part 1
Pharmacokinetic parameters were assessed using non-compartmental methods. Cmax is the maximum concentration of pexidartinib and ZAAD-1006a in plasma.
Measured: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hr post-dose of Cycle 1, Day 1 (C1D1) and Predose, 0.5 hr, 1 hr, 2 hr, 4 hr, and 6 hr postdose of Cycle 1, Day 15 (C1D15) (each cycle is 28 days)
Pharmacokinetic Parameter Area Under the Concentration-Time Curve From Time Zero to Time of Last Measurable Concentration of Pexidartinib and ZAAD-1006a (AUClast) in Part 1
Pharmacokinetic parameters were assessed using non-compartmental methods. AUClast is the area under the concentration-time curve from time zero to time of last measurable concentration of pexidartinib and ZAAD-1006a in plasma.
Measured: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hrs post-dose of Cycle 1, Day 1 (C1D1) (each cycle is 28 days)
Pharmacokinetic Parameter Area Under the Concentration-Time Curve Up to Infinity of Pexidartinib and ZAAD-1006a (AUCinf) in Part 1
Pharmacokinetic parameters were assessed using non-compartmental methods. AUCinf is the area under the concentration-time curve up to infinity of pexidartinib and ZAAD-1006a in plasma.
Measured: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hrs post-dose of Cycle 1, Day 1 (C1D1) (each cycle is 28 days)
Pharmacokinetic Parameter Time to Reach Maximum Concentration of Pexidartinib and ZAAD-1006a (Tmax) in Part 1
Pharmacokinetic parameters were assessed using non-compartmental methods. Tmax is the time to reach maximum concentration of pexidartinib and ZAAD-1006a in plasma.
Measured: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hr post-dose of Cycle 1, Day 1 (C1D1) and Predose, 0.5 hr, 1 hr, 2 hr, 4 hr, and 6 hr postdose of Cycle 1, Day 15 (C1D15) (each cycle is 28 days)
Objective Response Rate (ORR) Based on Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST Version 1.1) in Part 2
ORR will be assessed by centrally reviewed MRI scan based on RECIST version 1.1. Complete response (CR) was defined as a disappearance of all target lesions, partial response (PR) was defined as at least a 30% decrease in the sum of diameters of target lesions, and stable disease (SD) was defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (PD; at least a 20% increase in the sum of diameters of target lesions.
Measured: Week 25
Secondary outcomes (9)
ORR Based on Tumor Volume Score (TVS) in Part 2
ORR will be assessed by centrally reviewed MRI scan based on TVS.
Measured: Week 25
Range of Motion (ROM) in Part 2
Mean change from baseline in ROM of the affected joint, relative to a reference standard for the same joint will be assessed.
Measured: Week 25
Patient-reported Outcomes Measurement Information System (PROMIS) Physical Function Scale in Part 2
Mean change from baseline score in the PROMIS Physical Function Scale will be assessed.
Measured: Week 25
Brief Pain Inventory (BPI) Worst Pain Numeric Rating Scale (NRS) in Part 2
Proportion of responders will be assessed based on the BPI Worst Pain NRS item and analgesic use by BPI-30 definition (ie, 30% or more improvement in average NRS).
Measured: Week 25
Best Overall Response (BOR) Based on RECIST Version 1.1 in Part 2
BOR will be assessed by centrally reviewed magnetic resonance imaging (MRI) scan based on RECIST version 1.1.
Measured: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
BOR Based on TVS in Part 2
BOR will be assessed by centrally reviewed MRI scan based on TVS.
Measured: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
Duration of Response (DoR) Based on RECIST Version 1.1 in Part 2
DoR will be assessed by centrally reviewed MRI scan based on RECIST version 1.1.
Measured: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
DoR Based on TVS
DoR will be assessed by centrally reviewed MRI scan based on TVS.
Measured: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
Number of Participants Reporting Treatment-emergent Adverse Events (TEAEs) and Serious Adverse Events
Measured: Baseline up to 28 (+/- 7 days) after last dose, up to approximately 6 years 9 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted11 Jan 2021
- Study start15 Mar 2021
- Primary completion20 Mar 2023
- Study completion15 May 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Other trials for Tenosynovial Giant Cell TumorStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 9 participants (actual)
Sponsor and investigators
- Lead sponsor
- Daiichi Sankyo Co., Ltd.
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Global Clinical Leader, Study director, Daiichi Sankyo
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04703322
- Sponsor's protocol ID
- PL3397-A-J304
- Other IDs
- jRCT2041200074
- Status last verified
- May 2026
- First submitted
- 22 Dec 2020
- Last updated
- 24 Jun 2026
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 24 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 2, Multicenter, Two-Part, Open-Label Study of Pexidartinib in Adult Subjects With Tenosynovial Giant Cell Tumor in Japan
- ClinicalTrials.gov ID
- NCT04703322
- Acronym / sponsor ID
- PL3397-A-J304
- Conditions
- Tenosynovial Giant Cell Tumor
- Keywords
- Tenosynovial Giant Cell Tumor, TGCT, Giant Cell Tumor of Tendon Sheath, GCTTS, Pigmented Villonodular Synovitis, PVNS
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 9 participants (actual)
- Lead sponsor
- Daiichi Sankyo Co., Ltd.Industry (pharma, biotech, devices)
- Study start
- 15 Mar 2021 (actual)
- Primary completion
- 20 Mar 2023 (actual)
- Study completion
- 15 May 2026 (actual)
- First posted
- 11 Jan 2021 (actual)
- Results
- Posted 3 Mar 2025
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This phase 2, multicenter, two-part, open-label, single-arm study will be conducted in Japan and will evaluate the safety, tolerability, pharmacokinetics (PK), and efficacy of pexidartinib in adult participants with symptomatic tenosynovial giant cell tumor (TGCT) associated with severe morbidity or functional limitation and not amenable to improvement with surgery.
Detailed description
This study will consist of 2 parts. In Part 1, pexidartinib 800 mg/day (400 mg twice a day [BID]) will be administered on an empty stomach and tolerability and PK of pexidartinib will be evaluated to determine the initiation of Part 2. In Part 2, pexidartinib 800 mg/day (400 mg BID) will be administered on an empty stomach and efficacy, safety, and PK of pexidartinib will be evaluated.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Pexidartinib | Experimental | Drug: PexidartinibParticipants with TGCT who will receive oral pexidartinib 800 mg (400 mg twice daily [BID]). |
Who may qualify
- Ages
- 20 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (3 listed)
- Age ≥20 years
- A diagnosis of TGCT (i) that has been histologically confirmed by a pathologist1 and (ii) associated with severe morbidity or functional limitations and not amenable to improvement with surgery determined consensually by qualified personnel (eg, 2 surgeons or a multi-disciplinary tumor board).
- Measurable disease as defined by RECIST version 1.1 (except that a minimal size of 2 cm is required), assessed from MRI scan by a central radiologist.
Key exclusion criteria (4 listed)
- Known metastatic TGCT.
- Pre-existing increased serum transaminases; total bilirubin or direct bilirubin (>upper limit of normal); or active liver or biliary tract disease, including increased alkaline phosphatase.
- 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 a participant's study participation or the interpretation of his or her results.
- Use of strong cytochrome P450 3A inducers, including St John's wort, proton pump inhibitors and potassium-competitive acid blockers, or other products known to cause hepatotoxicity.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| PexidartinibAlso: TURALIO™, PLX3397400 mg twice daily for a total daily dose of 800 mg (each capsule contains 200 mg of pexidartinib for oral administration) | Drug | Pexidartinib |
Primary outcome
Dose-limiting Toxicity (DLT) in Part 1
Time frame: Cycle 1, Day 1 to Cycle 1, Day 28 (each cycle is 28 days)
The number of participants with any-grade DLT treatment-emergent adverse events (TEAEs) were assessed.
Pharmacokinetic Parameter Maximum Concentration of Pexidartinib and ZAAD-1006a (Cmax) in Part 1
Time frame: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hr post-dose of Cycle 1, Day 1 (C1D1) and Predose, 0.5 hr, 1 hr, 2 hr, 4 hr, and 6 hr postdose of Cycle 1, Day 15 (C1D15) (each cycle is 28 days)
Pharmacokinetic parameters were assessed using non-compartmental methods. Cmax is the maximum concentration of pexidartinib and ZAAD-1006a in plasma.
Pharmacokinetic Parameter Area Under the Concentration-Time Curve From Time Zero to Time of Last Measurable Concentration of Pexidartinib and ZAAD-1006a (AUClast) in Part 1
Time frame: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hrs post-dose of Cycle 1, Day 1 (C1D1) (each cycle is 28 days)
Pharmacokinetic parameters were assessed using non-compartmental methods. AUClast is the area under the concentration-time curve from time zero to time of last measurable concentration of pexidartinib and ZAAD-1006a in plasma.
Pharmacokinetic Parameter Area Under the Concentration-Time Curve Up to Infinity of Pexidartinib and ZAAD-1006a (AUCinf) in Part 1
Time frame: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hrs post-dose of Cycle 1, Day 1 (C1D1) (each cycle is 28 days)
Pharmacokinetic parameters were assessed using non-compartmental methods. AUCinf is the area under the concentration-time curve up to infinity of pexidartinib and ZAAD-1006a in plasma.
Pharmacokinetic Parameter Time to Reach Maximum Concentration of Pexidartinib and ZAAD-1006a (Tmax) in Part 1
Time frame: Predose, 0.5 hours (hr), 1 hr, 2 hr, 4 hr, 6 hr, 8 hr, 24 hr post-dose of Cycle 1, Day 1 (C1D1) and Predose, 0.5 hr, 1 hr, 2 hr, 4 hr, and 6 hr postdose of Cycle 1, Day 15 (C1D15) (each cycle is 28 days)
Pharmacokinetic parameters were assessed using non-compartmental methods. Tmax is the time to reach maximum concentration of pexidartinib and ZAAD-1006a in plasma.
Objective Response Rate (ORR) Based on Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST Version 1.1) in Part 2
Time frame: Week 25
ORR will be assessed by centrally reviewed MRI scan based on RECIST version 1.1. Complete response (CR) was defined as a disappearance of all target lesions, partial response (PR) was defined as at least a 30% decrease in the sum of diameters of target lesions, and stable disease (SD) was defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (PD; at least a 20% increase in the sum of diameters of target lesions.
9 secondary outcomes
ORR Based on Tumor Volume Score (TVS) in Part 2
Time frame: Week 25
Range of Motion (ROM) in Part 2
Time frame: Week 25
Patient-reported Outcomes Measurement Information System (PROMIS) Physical Function Scale in Part 2
Time frame: Week 25
Brief Pain Inventory (BPI) Worst Pain Numeric Rating Scale (NRS) in Part 2
Time frame: Week 25
Best Overall Response (BOR) Based on RECIST Version 1.1 in Part 2
Time frame: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
BOR Based on TVS in Part 2
Time frame: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
Duration of Response (DoR) Based on RECIST Version 1.1 in Part 2
Time frame: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
DoR Based on TVS
Time frame: Post Week 25 visit or following discontinuation from Part 2 of the study (whichever occurs first), up to approximately 1 year 6 months
Number of Participants Reporting Treatment-emergent Adverse Events (TEAEs) and Serious Adverse Events
Time frame: Baseline up to 28 (+/- 7 days) after last dose, up to approximately 6 years 9 months
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 24 Jun 2026.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Global Clinical Leader study director
Daiichi Sankyo
6 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Pexidartinib in people with Tenosynovial Giant Cell Tumor, run by Daiichi Sankyo Co., Ltd. at 6 sites in Japan.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 24 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 6 sites in Japan. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 3 Mar 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Dose-limiting Toxicity (DLT) in Part 1 (time frame: Cycle 1, Day 1 to Cycle 1, Day 28 (each cycle is 28 days)). The study lists 6 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Jun 2026.