ClinicalTrials.gg
TerminatedNCT04938180Updated May 24, 2024Results posted

A Phase 2 Study of Intravenous AMB-05X in Tenosynovial Giant Cell Tumor Patients

A Phase 2 interventional study of AMB-05X in Tenosynovial Giant Cell Tumor, Pigmented Villonodular Synovitis and TGCT, sponsored by AmMax Bio, Inc.. Terminated at 5 sites in 3 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2024-05-24.

Primary conditionSynovitis, Pigmented VillonodularRegistry: Giant Cell Tumor of Tendon SheathReclassifiedWhy we changed it
Registry
Giant Cell Tumor of Tendon Sheath — the first condition term the registry derived for this study.
ClinicalTrials.gg
Synovitis, Pigmented Villonodular
Why
  1. The study's listed conditions name Synovitis, Pigmented Villonodular, a narrower term within Giant Cell Tumor of Tendon Sheath.
Confidence
High: the new condition is named in the study's own listed conditions. Of 351 hand-checked studies reclassified this way, 68% were exactly right and 84% in the right disease family; the registry's first term was right for 5% (measured 2026-10-21). How we classify →
Wrong?
Tell us the study's main condition →

Sponsored by AmMax Bio, Inc. · Phase 2, Interventional, and Treatment

Why this study was terminated
Further enrollment was halted in November 2021, enrolled subjects completed the study. Sponsor stopped further recruitment in this intravenous study to focus on intra-articular route of administration in subjects with tenosynovial giant cell tumor.
Phase
Phase 2
Study type
Interventional
Enrollment
4
Allocation
Not applicable
Ages
18 Years and older
Sex
All
01

Study summary

The purpose of this Phase 2, open-label, multiple-dose, dose-escalation study is to evaluate intravenous AMB-05X in the treatment of subjects with TGCT.

Read the detailed description

AMB-05X drug substance is a human monoclonal antibody against the colony-stimulating factor 1 receptor (CSF1R).

02

Conditions studied

  • Tenosynovial Giant Cell Tumor
  • Pigmented Villonodular Synovitis
  • TGCT
  • PVNS - Pigmented Villonodular Synovitis

Browse trials for

Keywords

  • Tenosynovial Giant Cell Tumor, TGCT, PVNS
03

In context

Synovitis, Pigmented Villonodular Reclassified

20 studies on the registry are indexed under Synovitis, Pigmented Villonodular; 2 are open to participants now.

This study's enrollment of 4 is below the median of 36 across 17 interventional studies indexed under Synovitis, Pigmented Villonodular.

Browse Synovitis, Pigmented Villonodular studies →

Lead sponsor

AmMax Bio, Inc. is the lead sponsor of 6 studies on the registry; none are open to participants now.

Compared within Synovitis, Pigmented Villonodular, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Giant Cell Tumor of Tendon Sheath. The counts are of registry records indexed under each term, refreshed daily. How we classify →

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Subject ≥ 18 years
  2. A confirmed diagnosis of TGCT
  3. based on v1.1
  4. Symptomatic disease
  5. Stable prescription of analgesic regimen
  6. Agrees to follow guidelines
  7. Adequate hematologic, hepatic, and renal function, at Screening
  8. Willing and able to complete self-assessment instruments throughout the study

Exclusion criteria

Exclusion Criteria:

  1. Prior drug use within 4 weeks or 5 half-lives of Baseline
  2. Current or prior radiotherapy within 3 months before Baseline
  3. Current or prior active cancer within 3 years before Baseline that requires/required therapy (eg, surgery, chemotherapy, or radiation therapy)
  4. Known TGCT or malignant transformation of diffuse-type TGCT
  5. virus (HCV) or virus (HBV) or known active or chronic infection with human immuno deficiency virus ()
  6. Known active tuberculosis (TB)
  7. Significant concomitant arthropathy in the affected joint, serious illness, uncontrolled infection, or a medical or psychiatric history
  8. Women who are pregnant or breastfeeding
  9. Screening Fridericia- interval(QTcF) ≥450ms (men) or ≥470ms (women)
  10. MRI (eg, pacemaker, loose metallic implants)
  11. History of to any ingredient in the study drug
  12. History of drug or alcohol abuse within 3 months before Baseline
  13. Has any other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation/treatment, interfere with interpretation of study results, or, in the Investigator's opinion, make the subject inappropriate for this study
  14. A person who is held in detention as the result of a judicial or official decision or who is in a subordinate relationship to the Sponsor or Investigator
  15. A subject who, in the opinion of the Investigator, should not participate in the study for any reason, including if there is a question about the subject's ability to comply with study requirements
Terms in these criteria, in plain language(12)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Measurable disease

The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.

The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.

RECIST

The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.

“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Investigational drug or device

A drug or device being studied in a clinical trial.

It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.

Metastases

Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.

Hepatitis C tests

Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.

After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.

Hepatitis B tests

Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.

Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.

HIV

The human immunodeficiency virus, which weakens the immune system.

Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.

QT and QTc

On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.

The study may name a correction formula and a limit in milliseconds, often around 450–480.

Contraindication

A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.

Hypersensitivity

An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
4 participants (actual)

Study arms

  • Experimental
    Cohort A

    Each subject will receive a low dose of AMB-05X every 2 weeks, for a total of 6 doses over the 12-week treatment period.

    Biological: AMB-05X

Interventions

  • BiologicalAMB-05X

    AMB-05X is a fully human antibody antagonist (immunoglobulin G, type 2 \[IgG2\]) specific to the extracellular domain of human CSF1R

06

What researchers measure

Primary outcomes

  1. Treatment-emergent Adverse Events (TEAEs)

    The frequency and severity of reported TEAEs in Subjects with Tenosynovial Giant Cell Tumor (TGCT) receiving Intravenous AMB 05X.

    Time frame: 6 months

Secondary outcomes

  1. Overall Tumor Response (Objective Response) Per Response Evaluation Criteria in Solid Tumors (RECIST) v.1.1

    Response Evaluation Criteria in Solid Tumors (RECIST) v1.1; Per RECIST v1.0 for target lesions and assessed by MRI: A Complete Response (CR) is defined as disappearance of all tumors. A Partial Response (PR) is defined as at least a 30% decrease in the sum of diameters of target tumors from the baseline sum of diameters.

    Time frame: 12 weeks

  2. Overall Response Based on Tumor Volume Score (TVS)

    Tumor Volume Score (TVS) calculates tumor volume as a percentage of the estimated volume of the maximally distended synovial cavity or tendon sheath and provides a score in 10% increments. A score of 0 indicates no evidence of tumor; a score of 10 indicates a tumor that is equal in volume to that of a maximally distended synovial cavity or tendon sheath. Complete response (CR): lesion is completely gone; Partial response (PR): \>/=50% decrease in TVS relative to Baseline; Progressive disease (PD): \>/= 30% increase in TVS relative to the lowest score during the study; Stable disease (SD): does not meet any of the other classifications.

    Time frame: 24 weeks or ET visit

  3. Mean Change From Baseline Range of Motion (ROM) (Flexion, Knee) Scores

    Mean Change from Baseline in Range of Motion (ROM) Scores - Flexion (knee only). ROM is assessed by qualified assessors and recorded in degrees. At Baseline, the plane of movement with the smallest (worst) relative ROM was identified; only this plane was used for evaluating change in ROM. Higher scores indicate greater range of motion.

    Time frame: week 12

  4. Mean Change From Baseline in the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function Score

    Mean change from Baseline in the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function score is used to assess physical function. PROMIS is a 10-question patient reported outcome instrument used to assess physical functioning based on use of the upper extremities (dexterity), lower extremities (walking or mobility), and central regions (neck, back) and on instrumental activities of daily living. Five questions address the degree to which the subject's health limits activities, and subjects select a response that ranges from 1-"cannot do" to 5-"not at all". Five additional questions address the degree to which the subject is able to perform certain physical activities, and subjects select a response to each question that ranges from 1 ("cannot do") to 5 ("without any difficulty"). Raw scores are summarized. The score range is 10 to 50, higher scores = worse physical function

    Time frame: 12 weeks

  5. Serum Cmax for AMB-05X at Week 10 Post Dose

    The maximum concentration of AMB-05X in subject serum is measured at week 10 postdose, using sensitive enzyme-linked immunosorbent assay analyses (ELISA).

    Time frame: 10 weeks

  6. Number of Subjects With Anti-Drug Antibodies to AMB-05X at Week 10

    AMB-05X Anti-drug Antibodies (ADA) in subject serum will be measured from pre-dose samples.

    Time frame: 10 weeks

  7. Mean Change From Baseline in Worst Stiffness Numeric Rating Scale (NRS) Score

    The mean changes from Baseline in the Worst Stiffness Numeric Rating Scale (NRS) score, a Patient-Reported Outcome (PRO) Measurement. The Worst Stiffness NRS is a single-item instrument designed to assess "worst" stiffness at the site of the tumor in the last 24 hours. The instrument uses an 11-point numeric rating scale that ranges from 0 ("no stiffness") to 10 ("stiffness as bad as you can imagine"). Higher scores indicate worse stiffness.

    Time frame: 12 weeks

  8. Brief Pain Inventory Pain Severity Domain Score

    The mean changes from Baseline in Brief Pain Inventory (BPI) Pain Severity Domain. (Score of 0-10, where a negative score from baseline indicates a better BPI score, less severe pain) Brief Pain Inventory (BPI) is a self-administered questionnaire used to evaluate the severity of a subject's pain and the impact of this pain on the subject's daily functioning. For the Pain Severity domain the subject is asked to rate their worst, least, average, and current pain intensity, and list current treatments and their perceived effectiveness on a scale from 0 to 10, where higher scores mean more severe pain. All of the 0-10 scores are averaged to obtain the total Domain (subscale) Score.

    Time frame: 12 weeks

  9. Mean Change From Baseline in Brief Pain Inventory Severity Interference

    The mean changes from Baseline in Brief Pain Inventory (BPI) Severity Interference domain. The BPI Short Form is a patient-reported outcome instrument used to evaluate the severity of a subject's pain and the impact of this pain on the subject's daily functioning. For this domain, the subject is asked to rate their worst, least, average, and current pain intensity, list current treatments and their perceived effectiveness, and rate the degree that pain interferes with general activity, mood, walking ability, normal work, relations with other persons, sleep, and enjoyment of life on a scale from 0 to 10, where higher scores mean more pain interference. The reported score is the mean of the seven interference items. Higher scores indicate greater levels of pain.

    Time frame: 12 weeks

  10. Worst Pain Numeric Rating Scale Score

    Mean change from Baseline in Worst Pain Numeric Rating Scale score. The Worst Pain Numeric Rating Scale is an item in the BPI that assesses a subject's "worst" pain in the last 24 hours. The 11-point Numeric Rating Scale for this item ranges from 0 ("no pain") to 10 ("pain as bad as you can imagine"). Higher scores indicate greater level of pain.

    Time frame: 12 weeks

  11. EuroQol 5 Dimension 5 Level Health Assessment

    Mean change from Baseline in the EuroQol 5 Dimension 5 Level (EQ-5D-5L) assessment Scale Score (5-25). This instrument is a self-report survey that measures quality of life across 5 domains: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each dimension is scored on a 5-level severity ranking that ranges from "no problems" through "extreme problems". Higher scores indicate a lower quality of life.

    Time frame: 12 weeks

  12. Colony-stimulating Factor 1 Levels

    Serum colony-stimulating factor-1 (CSF-1) levels are measured in patient/subject serum. Samples were collected for measurement of CSF-1 at least once at specified visits.

    Time frame: 10 weeks

  13. Mean Change From Baseline Rnge of Motion (Flexion, Ankle) Scores

    Mean Change from Baseline in Range of Motion (ROM) Scores - Flexion (Ankle only). ROM is assessed by qualified assessors and recorded in degrees. At Baseline, the plane of movement with the smallest (worst) relative ROM was to be identified; only this plane was used for evaluating change in ROM. Higher scores indicate greater range of motion.

    Time frame: week 12

  14. Serum AMB-05X-Binding Anti-drug Antibody (ADA) Levels

    Series analysis for anti-drug antibody detection and titer

    Time frame: Week 12

07

Results

Posted May 24, 2024
Limitations and caveats
A decision was made in November 2021 to stop further enrollment into the study to allow development to focus on AMB-05X intra-articular administration for TGCT. A total of 4 subjects had been enrolled into the study at the time the decision to cease further enrollment was made, limiting the ability to interpret the resulting data.

Participant flow

Participant flow — Overall Study
MilestoneSubjects With Tenosynovial Giant Cell Tumor
Started4
Completed3
Not completed1
Withdrew: Adverse event1

Outcome measures

PrimaryTreatment-emergent Adverse Events (TEAEs)

The frequency and severity of reported TEAEs in Subjects with Tenosynovial Giant Cell Tumor (TGCT) receiving Intravenous AMB 05X.

Time frame:
6 months
Reported as:
Count of participants · Participants
Treatment-emergent Adverse Events (TEAEs)
ParticipantsCohort A: Subjects With TGCT
Number of subjects with treatment-emergent adverse events4
Number of subjects without treatment-emergent adverse events0
SecondaryOverall Tumor Response (Objective Response) Per Response Evaluation Criteria in Solid Tumors (RECIST) v.1.1

Response Evaluation Criteria in Solid Tumors (RECIST) v1.1; Per RECIST v1.0 for target lesions and assessed by MRI: A Complete Response (CR) is defined as disappearance of all tumors. A Partial Response (PR) is defined as at least a 30% decrease in the sum of diameters of target tumors from the baseline sum of diameters.

Time frame:
12 weeks
Reported as:
Count of participants · Participants
Overall Tumor Response (Objective Response) Per Response Evaluation Criteria in Solid Tumors (RECIST) v.1.1
ParticipantsCohort A: Subjects With TGCT
Subjects with CR0
Subjects with PR1
Subjects with stable disease2
SecondaryOverall Response Based on Tumor Volume Score (TVS)

Tumor Volume Score (TVS) calculates tumor volume as a percentage of the estimated volume of the maximally distended synovial cavity or tendon sheath and provides a score in 10% increments. A score of 0 indicates no evidence of tumor; a score of 10 indicates a tumor that is equal in volume to that of a maximally distended synovial cavity or tendon sheath. Complete response (CR): lesion is completely gone; Partial response (PR): \>/=50% decrease in TVS relative to Baseline; Progressive disease (PD): \>/= 30% increase in TVS relative to the lowest score during the study; Stable disease (SD): does not meet any of the other classifications.

Time frame:
24 weeks or ET visit
Reported as:
Count of participants · Participants
Overall Response Based on Tumor Volume Score (TVS)
ParticipantsCohort A: Subjects With TGCT
Subjects with CR0
Subjects with PR0
Subjects with SD3
SecondaryMean Change From Baseline Range of Motion (ROM) (Flexion, Knee) Scores

Mean Change from Baseline in Range of Motion (ROM) Scores - Flexion (knee only). ROM is assessed by qualified assessors and recorded in degrees. At Baseline, the plane of movement with the smallest (worst) relative ROM was identified; only this plane was used for evaluating change in ROM. Higher scores indicate greater range of motion.

Time frame:
week 12
Reported as:
Count of participants · Participants
Mean Change From Baseline Range of Motion (ROM) (Flexion, Knee) Scores
ParticipantsCohort A: Subjects With TGCT
Subjects with no change in ROM from baseline1
Subjects with change in ROM Left Knee1
Subjects with change in ROM Right Knee1
SecondaryMean Change From Baseline in the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function Score

Mean change from Baseline in the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function score is used to assess physical function. PROMIS is a 10-question patient reported outcome instrument used to assess physical functioning based on use of the upper extremities (dexterity), lower extremities (walking or mobility), and central regions (neck, back) and on instrumental activities of daily living. Five questions address the degree to which the subject's health limits activities, and subjects select a response that ranges from 1-"cannot do" to 5-"not at all". Five additional questions address the degree to which the subject is able to perform certain physical activities, and subjects select a response to each question that ranges from 1 ("cannot do") to 5 ("without any difficulty"). Raw scores are summarized. The score range is 10 to 50, higher scores = worse physical function

Time frame:
12 weeks
Reported as:
Mean · score on a scale
Mean Change From Baseline in the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function Score
score on a scaleCohort A: Subjects With TGCT
Mean Change From Baseline in the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function Score0 ± 2.65
SecondarySerum Cmax for AMB-05X at Week 10 Post Dose

The maximum concentration of AMB-05X in subject serum is measured at week 10 postdose, using sensitive enzyme-linked immunosorbent assay analyses (ELISA).

Time frame:
10 weeks
Reported as:
Mean · ng/mL
Serum Cmax for AMB-05X at Week 10 Post Dose
ng/mLCohort A: Subjects With TGCT
Serum Cmax for AMB-05X at Week 10 Post Dose54,457 ± 30,356
SecondaryNumber of Subjects With Anti-Drug Antibodies to AMB-05X at Week 10

AMB-05X Anti-drug Antibodies (ADA) in subject serum will be measured from pre-dose samples.

Time frame:
10 weeks
Reported as:
Count of participants · Participants
Number of Subjects With Anti-Drug Antibodies to AMB-05X at Week 10
ParticipantsSubjects With Tenosynovial Giant Cell Tumor
Subjects ADA positive at any visit analyzed1
Subjects ADA negative at every visit analyzed3
SecondaryMean Change From Baseline in Worst Stiffness Numeric Rating Scale (NRS) Score

The mean changes from Baseline in the Worst Stiffness Numeric Rating Scale (NRS) score, a Patient-Reported Outcome (PRO) Measurement. The Worst Stiffness NRS is a single-item instrument designed to assess "worst" stiffness at the site of the tumor in the last 24 hours. The instrument uses an 11-point numeric rating scale that ranges from 0 ("no stiffness") to 10 ("stiffness as bad as you can imagine"). Higher scores indicate worse stiffness.

Time frame:
12 weeks
Reported as:
Mean · score on a scale
Mean Change From Baseline in Worst Stiffness Numeric Rating Scale (NRS) Score
score on a scaleCohort A: Subjects With TGCT
Mean Change From Baseline in Worst Stiffness Numeric Rating Scale (NRS) Score-2.7 ± 2.52
SecondaryBrief Pain Inventory Pain Severity Domain Score

The mean changes from Baseline in Brief Pain Inventory (BPI) Pain Severity Domain. (Score of 0-10, where a negative score from baseline indicates a better BPI score, less severe pain) Brief Pain Inventory (BPI) is a self-administered questionnaire used to evaluate the severity of a subject's pain and the impact of this pain on the subject's daily functioning. For the Pain Severity domain the subject is asked to rate their worst, least, average, and current pain intensity, and list current treatments and their perceived effectiveness on a scale from 0 to 10, where higher scores mean more severe pain. All of the 0-10 scores are averaged to obtain the total Domain (subscale) Score.

Time frame:
12 weeks
Reported as:
Mean · score on a scale
Brief Pain Inventory Pain Severity Domain Score
score on a scaleCohort A: Subjects With TGCT
Brief Pain Inventory Pain Severity Domain Score-0.83 ± 1.665
SecondaryMean Change From Baseline in Brief Pain Inventory Severity Interference

The mean changes from Baseline in Brief Pain Inventory (BPI) Severity Interference domain. The BPI Short Form is a patient-reported outcome instrument used to evaluate the severity of a subject's pain and the impact of this pain on the subject's daily functioning. For this domain, the subject is asked to rate their worst, least, average, and current pain intensity, list current treatments and their perceived effectiveness, and rate the degree that pain interferes with general activity, mood, walking ability, normal work, relations with other persons, sleep, and enjoyment of life on a scale from 0 to 10, where higher scores mean more pain interference. The reported score is the mean of the seven interference items. Higher scores indicate greater levels of pain.

Time frame:
12 weeks
Reported as:
Mean · score on a scale
Mean Change From Baseline in Brief Pain Inventory Severity Interference
score on a scaleCohort A: Subjects With TGCT
Mean Change From Baseline in Brief Pain Inventory Severity Interference0.81 ± 1.528
SecondaryWorst Pain Numeric Rating Scale Score

Mean change from Baseline in Worst Pain Numeric Rating Scale score. The Worst Pain Numeric Rating Scale is an item in the BPI that assesses a subject's "worst" pain in the last 24 hours. The 11-point Numeric Rating Scale for this item ranges from 0 ("no pain") to 10 ("pain as bad as you can imagine"). Higher scores indicate greater level of pain.

Time frame:
12 weeks
Reported as:
Mean · score on a scale
Worst Pain Numeric Rating Scale Score
score on a scaleCohort A: Subjects With TGCT
Worst Pain Numeric Rating Scale Score-0.3 ± 1.53
SecondaryEuroQol 5 Dimension 5 Level Health Assessment

Mean change from Baseline in the EuroQol 5 Dimension 5 Level (EQ-5D-5L) assessment Scale Score (5-25). This instrument is a self-report survey that measures quality of life across 5 domains: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each dimension is scored on a 5-level severity ranking that ranges from "no problems" through "extreme problems". Higher scores indicate a lower quality of life.

Time frame:
12 weeks
Reported as:
Mean · score on a scale
EuroQol 5 Dimension 5 Level Health Assessment
score on a scaleCohort A: Subjects With TGCT
EuroQol 5 Dimension 5 Level Health Assessment-0.3 ± 0.58
SecondaryColony-stimulating Factor 1 Levels

Serum colony-stimulating factor-1 (CSF-1) levels are measured in patient/subject serum. Samples were collected for measurement of CSF-1 at least once at specified visits.

Time frame:
10 weeks
Reported as:
Mean · pg/mL
Colony-stimulating Factor 1 Levels
pg/mLCohort A: Subjects With TGCT
Colony-stimulating Factor 1 Levels1216 ± 372
SecondaryMean Change From Baseline Rnge of Motion (Flexion, Ankle) Scores

Mean Change from Baseline in Range of Motion (ROM) Scores - Flexion (Ankle only). ROM is assessed by qualified assessors and recorded in degrees. At Baseline, the plane of movement with the smallest (worst) relative ROM was to be identified; only this plane was used for evaluating change in ROM. Higher scores indicate greater range of motion.

Time frame:
week 12

No measurements were reported for this outcome.

SecondarySerum AMB-05X-Binding Anti-drug Antibody (ADA) Levels

Series analysis for anti-drug antibody detection and titer

Time frame:
Week 12
Reported as:
Count of participants · Participants
Serum AMB-05X-Binding Anti-drug Antibody (ADA) Levels
ParticipantsSubjects With Tenosynovial Giant Cell Tumor
Baseline visit — Subjects ADA negative3
Baseline visit — Subjects ADA positive1
Visit 7 — Subjects ADA negative2
Visit 7 — Subjects ADA positive1

Adverse events

Collected over 6 months. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Tenosynovial Giant Cell Tumor - Events During Initial Treatment Period0/4 (0%)0/4 (0%)0/4 (0%)
Tenosynovial Giant Cell Tumor - Events During Maintenance Treatment Period0/4 (0%)0/4 (0%)4/4 (100%)
Most frequent other events
Showing 10 of 12
Most frequent other events
EventTenosynovial Giant Cell Tumor - Events During Initial Treatment PeriodTenosynovial Giant Cell Tumor - Events During Maintenance Treatment Period
face edemaGeneral disorders0/44/4
blood lactate dehydrogenase increasedInvestigations0/42/4
hepatic enzyme increasedInvestigations0/41/4
epistaxisRespiratory, thoracic and mediastinal disorders0/41/4
hypertensionVascular disorders0/41/4
headacheNervous system disorders0/41/4
rash maculopapularSkin and subcutaneous tissue disorders0/41/4
skin hyperpigmentationSkin and subcutaneous tissue disorders0/41/4
diarrheaGastrointestinal disorders0/41/4
aspartate aminotransferase increasedInvestigations0/41/4

Baseline characteristics

A total of 48 subjects were planned. However, enrollment into the study was stopped in November 2021 after 4 subjects were enrolled to focus more on AMB-05X intra-articular administration.

Age, Categorical
Age, Categorical(Participants)Cohort A: Subjects With TGCT
<=18 years0
Between 18 and 65 years3
>=65 years1
Sex: Female, Male
Sex: Female, Male(Participants)Cohort A: Subjects With TGCT
Female4
Male0
Ethnicity (NIH/OMB)
Ethnicity (NIH/OMB)(Participants)Cohort A: Subjects With TGCT
Hispanic or Latino0
Not Hispanic or Latino4
Unknown or Not Reported0
Race (NIH/OMB)
Race (NIH/OMB)(Participants)Cohort A: Subjects With TGCT
American Indian or Alaska Native0
Asian0
Native Hawaiian or Other Pacific Islander0
Black or African American0
White4
More than one race0
Unknown or Not Reported0
Region of Enrollment
Region of Enrollment(participants)Cohort A: Subjects With TGCT
Hungary1
Ukraine2
Poland1
08

Study locations

5 sites
  • AmMax Bio Clinical Site
    Budapest, Hungary
  • AmMax Bio Clinical Site
    Warsaw, Poland
  • AmMax Bio Clinical Site
    Dnipro, Ukraine
  • AmMax Bio Clinical Site
    Kharkiv, Ukraine
  • AmMax Bio Clinical Site
    Kyiv, Ukraine
09

References and documents

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

Individual participant data

Plan to share: No

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on May 24, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT04938180
Lead sponsor
AmMax Bio, Inc.
Responsible party
Sponsor
First posted
Jun 24, 2021
Start date
Sep 16, 2021
Primary completion
Apr 20, 2022
Completion
May 17, 2022
Results posted
May 24, 2024
Last update
May 24, 2024

Study contacts

Dorothy Nguyen, MD
study chair · AmMax Bio, Inc.

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Studies of the drug tested here: Anti-CSF1R Monoclonal Antibody AMB-05X

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