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VEXAS SyndromePhase 2/3ATLASNCT07569081

A Study Evaluating the Efficacy and Safety of Momelotinib in Participants With Vacuoles, E1-enzyme, X-linked, Autoinflammatory, Somatic (VEXAS) Syndrome

A Phase 2/3 study testing Momelotinib and Glucocorticoids in people with VEXAS Syndrome, run by GlaxoSmithKline.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
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Trial summary

This study will assess the efficacy and safety of momelotinib in participants with a diagnosis of VEXAS. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
VEXAS Syndrome
What is being tested?
Momelotinib and Glucocorticoids
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
136 participants
Where
No sites listed yet
Study dates
5 Aug 2026to 4 Jun 2031
Phase
Phase 2/3
Are there results?
Not yet: the study is under way

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 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age greater than equal to (>=)18 years OR of legal age of consent in the jurisdiction in which the study is taking place, at the time of signing the Informed Consent Form.
  • Confirmed diagnosis of clinical VEXAS defined by:
  • Documented evidence of a canonical, pathogenic Ubiquitin-like modifier activating enzyme 1 (UBA1) mutation
  • Inflammatory manifestations: current or documented past involvement within 6 months of at least one organ system
  • Receiving glucocorticoid (GC) treatment (prednisone/prednisolone) for >=4 consecutive weeks for >=10 days prior to randomization.
  • A female participant is eligible to participate if she is not pregnant or breastfeeding and one of the following conditions applies:
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  • Is a Participant of non-childbearing potential (PONCBP) OR
  • Is a Participant of childbearing potential (POCBP) and using a contraceptive method that is highly effective
  • Is capable of giving signed informed consent including compliance with the requirements and restrictions
  • Eastern Cooperative Oncology Group Performance Status (ECOG PS) of 0 to 2 at the time of screening.
  • Has adequate organ function

Who cannot join

  • More than 1 prior admission to an intensive care unit due to a VEXAS flare within the 6 months prior to randomization.
  • History of severe corticosteroid toxicity: uncontrolled concomitant cardiovascular, nervous system, pulmonary (including obstructive pulmonary disease), renal, hepatic, endocrine (including uncontrolled diabetes mellitus), psychiatric, osteoporosis/osteomalacia, glaucoma, corneal ulcers/injuries, nausea or vomiting or gastrointestinal disease.
  • High risk/very high risk Myelodysplastic syndrome (MDS), according to the Revised International Prognostic Scoring System (IPSS-R) with overall risk score >3.5.
  • Peripheral blood blast counts >=10%.
  • Multiple myeloma (all stages) and other active plasma cell dyscrasias requiring treatment.
  • Malignancy (except disease under study including Lower-risk myelodysplastic syndrome [LR-MDS]) that has progressed or required active treatment within the past (24 months) except for basal cell or squamous cell carcinomas of the skin or in-situ carcinomas).
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  • Uncontrolled intercurrent illness within 12 weeks prior to initiation of momelotinib.
  • Ongoing adverse reaction(s) from prior therapy that have not recovered to Grade <=1 per NCI CTCAE v6.0 or to the Baseline status preceding prior therapy
  • Psychiatric illness, social situation, or any other condition that would limit informed consent and/or compliance with trial requirements or may interfere with the interpretation of study results, as judged by Investigator or Sponsor.
  • Has any clinically significant gastrointestinal conditions or abnormalities that may alter absorption or swallowing
  • Known contraindication or hypersensitivity to momelotinib and its metabolites, or any of their excipients.
  • Presence of peripheral neuropathy >=Grade 2 per NCI CTCAE v6.0.
  • Known history of disseminated mycobacterial infection.
  • Known positive status for human immunodeficiency virus (HIV).
  • Positive QuantiFERON (or other interferon gamma release assay) during Screening.
  • Unable to receive any Pneumocystis jiroveci pneumonia (PJP) medical prophylaxis
  • Known clinically significant anemia due to iron, vitamin B12 or folate deficiencies, or autoimmune or hereditary hemolytic anemia, gastrointestinal bleeding, or thalassemia.
  • More than 1 prior line of VEXAS directed therapy before or after VEXAS diagnosis or other medical condition.
  • Use of the following treatments within the noted time periods referenced from date of randomization:
  • VEXAS-directed therapies (washout period) up to 5 half-lives or up 14 days if half-life is <3 days
  • Other non-GC anti-inflammatory therapies: for non-biologics): 14 days or five half-lives, whichever is longer; for biologics): 28 days or two half-lives whichever is longer.
  • Hematologic support therapy (e.g., ESAs, danazol, luspatercept, G-CSF): 4 weeks
  • Cell-depleting therapies such as anti-CD20 (rituximab): 12 months
  • Investigational agent from a class not otherwise specified: 5 half-lives or 60 days, whichever is longer
  • GC use for conditions other than VEXAS, which would interfere with adherence to the fixed GC taper regimen and/or to assessment of efficacy.
  • Chronic use of systemic corticosteroids for >4 years or inability to withdraw corticosteroid treatment
  • Planned allogeneic HSCT for MDS or VEXAS, within 1 year.
  • Any major surgery within 28 days prior to randomization.
  • Prior allogeneic/autologous stem cell transplant or solid organ transplant (other than corneal).
  • Presence of peripheral neuropathy >=Grade 2 per NCI CTCAE v6.0.
  • Hepatitis B or C active infection, unless protocol defined criteria are met.
  • Any of the following conditions within 6 months prior to randomization:
  • Unstable angina pectoris
  • Symptomatic congestive heart failure
  • Uncontrolled cardiac arrhythmia
  • QTc >450 msec or QTc >480 msec for participants with bundle branch block.

Trial locations and contacts

No sites are listed yet. Contact the study team or a site near you to ask about taking part.

US GSK Clinical Trials Call Center contact

877-379-3718

GSKClinicalSupportHD@gsk.com

EU GSK Clinical Trials Call Center contact

+44 (0) 20 89904466

GSKClinicalSupportHD@gsk.com

About this study

Official title: A Randomized Phase 2/3, Double-blind, Placebo Controlled Adaptive Study Evaluating the Efficacy and Safety of Momelotinib in Participants With VEXAS Syndrome

This study will assess the efficacy and safety of momelotinib in participants with a diagnosis of VEXAS.

Conditions
VEXAS Syndrome
Being tested
Momelotinib, Glucocorticoids, Placebo
Keywords
VEXAS Syndrome, Momelotinib, Adaptive, Ubiquitin-like modifier activating enzyme 1 mutation, ATLAS
Medical subject headings
VEXAS syndrome

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • MomelotinibDrug

    Also called GSK3070785

    Momelotinib will be administered

  • GlucocorticoidsDrug

    Glucocorticoids (prednisone or prednisolone) will be administered

  • PlaceboDrug

    Placebo will be administered

Study groups in NCT07569081
Study groupRoleWhat they receive
Momelotinib Dose level 1 + GlucocorticoidsExperimentalParticipants will receive momelotinib at dose level 1 along with glucocorticoids as a background therapy (prednisone or prednisolone). Due to adaptive design of the study, additional participants may be randomized to this arm in phase 3.
Receives: Drug: Momelotinib; Drug: Glucocorticoids
Momelotinib Dose level 2 + GlucocorticoidsExperimentalParticipants will receive momelotinib at dose level 2 along with glucocorticoids as a background therapy (prednisone or prednisolone). Due to adaptive design of the study, additional participants may be randomized to this arm in phase 3
Receives: Drug: Momelotinib; Drug: Glucocorticoids
Placebo + GlucocorticoidsPlacebo comparatorParticipants will receive momelotinib matched placebo along with glucocorticoids as a background therapy(prednisone or prednisolone). Due to adaptive design of the study, additional participants may be randomized to this arm in phase 3
Receives: Drug: Glucocorticoids; Drug: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. ORR (Objective response rate) at Week 26

    ORR is defined as the proportion of participants who have achieved complete response (CR) or partial response (PR) during the 26-week Primary Treatment Period.

    Measured: At Week 26

Secondary outcomes (22)
  1. Phase 2: Percentage of participants with partial response (PR) or complete response (CR) at Week 26

    Percentage of participants with PR or CR at Week 26 to support identification of the Recommended Phase 3 dose (RP3D)

    Measured: At Week 26

  2. Phase 2: Number of participants with adverse events and clinically significant changes in laboratory parameters, and vital signs to support identification of the RP3D

    Measured: Up to 26 Weeks

  3. Phase 2: Plasma concentrations of momelotinib and metabolite of momelotinib 21 (M21) to support identification of the RP3D

    Measured: Up to 26 Weeks

  4. Number of flare-free days

    Flare-free days are calendar days without clinical evidence of VEXAS flare and without treatment escalation. Total number of flare-free days is defined as the cumulative number of consecutive and non-consecutive flare-free days.

    Measured: Up to 26 Weeks

  5. Duration of response (DoR)

    DoR defined as the date of clinical response (CR or PR) to the date of relapse.

    Measured: Up to 104 Weeks

  6. Number of flare-free days with glucocorticoid (GC) dose <=10 mg/day

    Flare-free days are calendar days without clinical evidence of VEXAS flare and without treatment escalation. Total number of flare-free days is defined as the cumulative number of consecutive and non-consecutive flare-free days.

    Measured: Up to 104 Weeks

  7. Percentage of participants achieving complete and partial biochemical response

    Complete biological response is defined as complete or partial normalization of C-reactive protein.

    Measured: Up to 26 Weeks

  8. Objective response rate (ORR) at Week 52

    ORR is defined as the proportion of participants who have achieved complete response or partial response

    Measured: At Week 52

  9. Number of Participants with Hematologic Improvement- Erythroid (HI-E) response per International Working Group (IWG) 2018 criteria

    HI-E response is measured based on the combined incidence of: Low transfusion burden participants defined as absence of any transfusion for greater than or equal to (>=)8 consecutive weeks. High transfusion burden participants: minor response defined as reduction by >=50% of red blood cell (RBC) units for >=8 consecutive weeks. Major response defined as absence of RBC transfusions for >=8 consecutive weeks or longer up to 26 weeks.

    Measured: Up to 26 Weeks

  10. Change from Baseline in Short Form 36 (SF-36) domain and summary scores

    Short-Form 36 is a health-related survey that assesses quality of life covering 8 domains: vitality; physical functioning; bodily pain; general health perceptions; physical role functioning; emotional role functioning; social role functioning; and mental health. The domain scores are weighted to a scale ranging between 0 to 100, where higher score represents better health. The Physical Component Summary (PCS) and Mental Component Summary (MCS) scores are derived from the eight domain scores. These scores are standardized to a general U.S. population average of 50, with a standard deviation of 10. For both PCS and MCS, scores range from 0 to 100, higher scores indicate a better health outcome.

    Measured: Baseline and up to Week 48

  11. Change from Baseline in European Organization for Research and Treatment of Cancer Item Library (EORTC IL) 479 score

    The EORTC Item Library is a database containing >1000 individual items from more than 70 EORTC quality of life measures. A subset of 7 items from the library were selected based on symptoms experienced by participants with VEXAS syndrome. Scores range from 1 to 100 with higher scores representing a higher ("worse") level of symptoms.

    Measured: Baseline and up to Week 156

  12. Change From Baseline in Patient Reported Outcome Measurement Information System (PROMIS) Physical Function Short Form 10b

    PROMIS Physical Function Short Form 10b consists of 10 questions; each with a 5-point response. PROMIS short form assesses self-reported capability of a participant rather than actual performance of physical activities. Higher scores indicate better functioning. Total possible range of scores is 10 to 50, with higher scores corresponding to a greater physical function ability.

    Measured: Baseline and up to Week 156

  13. Change from Baseline in Functional Assessment of Chronic Illness Therapy - Fatigue (FACIT-FATIGUE)

    The FACIT-Fatigue is a short, 13-item questionnaire that assesses self-reported fatigue and its associated impact on daily activities over the past 7 days. A higher score indicates a better outcome (no fatigue). The total score ranges from 0 to 52, with 0 being the worst possible score and 52 being the best possible score (indicating no fatigue).

    Measured: Baseline and up to Week 156

  14. Changes from Baseline in Patient Global Impression of Severity (PGIS) scores

    The PGIS is a single global question which asks participants to rate the severity of their VEXAS syndrome symptoms on a 5-point rating scale with response categories of "No symptoms", "Mild", "Moderate", "Severe", and "Very Severe." The PGIS scores ranges from 0 (absent) to 4 (very severe).

    Measured: Baseline and up to Week 156

  15. Changes in Patient Global Impression of Change (PGIC) scores

    The PGIC is a single global question which asks participants to rate the change in severity of their VEXAS syndrome symptoms since starting study medication using a 5-point rating scale with response categories of "much better", "a little better", "no change", "a little worse", "much worse". The PGIC score ranges from +2 (much better) to -2 (much worse).

    Measured: Baseline and up to Week 156

  16. Changes from Baseline in European quality of life 5 dimensions 5 level version (EQ-5D-5L)

    EQ-5D-5L is self-assessment questionnaire, consisting of 5 items covering 5 dimensions (mobility, self care, usual activities, pain/discomfort, and anxiety/depression). Each dimension is measured by 5-point Likert scale ranging from 1=no problems to 5=extreme problems.

    Measured: Baseline and up to Week 48

  17. Changes from Baseline in European quality of life-Visual Analogue Scale (EQ-VAS)

    The EQ-VAS records the respondents self-rated health on a vertical VAS, ranging from 0 to 100, where 0 represents the worst imaginable health and 100 represents the best imaginable health.

    Measured: Baseline and up to Week 48

  18. Number of participants with adverse events (AEs) and Serious adverse events (SAEs)

    Measured: Up to Week 108

  19. Number of participants with adverse events (AEs) and Serious adverse events (SAEs) by severity

    Measured: Up to Week 108

  20. Number of participants with AEs leading to discontinuation or dose modifications

    Measured: Up to Week 108

  21. Plasma concentration of momelotinib and M21

    Measured: Up to 26 Weeks

  22. Overall Survival

    Overall survival is defined as the time from randomization to the date of death due to any cause.

    Measured: At Months 12, 24 and 36

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted6 May 2026
  2. Study start5 Aug 2026 (estimated)
  3. Primary completion6 Dec 2028 (estimated)
  4. Study completion4 Jun 2031 (estimated)

Resources

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 2/3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
136 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07569081
Sponsor's protocol ID
223401
Other IDs
2025-524416-11-00, 2025
Acronym
ATLAS
Status last verified
May 2026
First submitted
28 Apr 2026
Last updated
1 Jun 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2/3 study testing Momelotinib and Glucocorticoids in people with VEXAS Syndrome, run by GlaxoSmithKline.

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 11 inclusion and 36 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: opening soon, as of the sponsor's last update on 1 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined 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.

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact US GSK Clinical Trials Call Center (877-379-3718, GSKClinicalSupportHD@gsk.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

ORR (Objective response rate) at Week 26 (time frame: At Week 26). 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 1 Jun 2026; AzTrials last refreshed its copy on 7 Nov 2026.

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