Clinical trial Recruiting at 1 site Phase 1 Interventional Ages 18 to 75

Phase 1 safety test of XmAb657 in healthy adults and people with myositis, scleroderma, or Sjögren's

Official title: A Phase 1, First-in-Human, Open-Label, Dose-Escalation Study to Evaluate the Safety and Tolerability, Pharmacokinetics, and Pharmacodynamics of XmAb657 in Healthy Participants and in Participants With Autoimmune Diseases

Run by Xencor, Inc. · NCT07284797 · Data updated 2026-11-12

This study will test whether subcutaneous injections of XmAb657 are safe and well tolerated in healthy adults and people with autoimmune diseases such as idiopathic inflammatory myopathies, systemic sclerosis, or primary Sjögren's syndrome.

More Systemic Sclerosis trials

Quick facts

PhasePhase 1
Study typeInterventional
Ages18 Years to 75 Years
SexAll
Enrollment60 (estimated)
SponsorXencor, Inc.
Industry-sponsored
Locations1 site (Melbourne)
StatusRecruiting
StartedFebruary 24, 2026
Main results expectedOctober 2028
Study endsOctober 2028
Registry record updatedAugust 3, 2026
Trial IDNCT07284797 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults in good health for the healthy cohort or adults who meet the 2017 EULAR/ACR criteria for IIM, the 2013 ACR/EULAR criteria for systemic sclerosis, or the 2016 ACR/EULAR criteria for primary Sjögren's and who agree to use effective contraception.

Probably not a fit

Patients with active or recurrent infections, untreated latent tuberculosis, recent major surgery, recent cancer or lymphoproliferative disease, or uncontrolled cardiovascular, pulmonary, renal, hepatic, endocrine, or gastrointestinal disease are unlikely to benefit and are excluded.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is an open-label Phase 1 trial that administers XmAb657 subcutaneously to cohorts of healthy adults and adults who meet established classification criteria for idiopathic inflammatory myopathies, systemic sclerosis, or primary Sjögren's syndrome. The study is designed to collect safety and tolerability data and to measure pharmacokinetics, pharmacodynamics, and immunogenicity signals. Standard exclusion criteria apply, including recent major surgery, active or recurrent infections, untreated latent tuberculosis, recent cancer, and uncontrolled major organ disease. The sponsor is Xencor, Inc., and dosing and follow-up occur at the listed investigative site in Melbourne.

Why it matters

Potential benefit: If successful, XmAb657 could become a new immune-targeting treatment option for people with certain autoimmune diseases that are poorly controlled by current therapies.

How similar studies have gone: Other monoclonal antibody therapies targeting immune pathways have shown benefit in some autoimmune diseases, but XmAb657 itself is an early-stage investigational agent with limited prior clinical data.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

Healthy participants - Adult participants in good health

Idiopathic inflammatory myopathy (IIM) participants - Adult participants that meet the 2017 European Alliance of Association Rheumatology (EULAR)/American College of Rheumatology (ACR) Classification Criterion for IIM

Systemic sclerosis (SSc) participants - Adult participants that meet the 2013 ACR/EULAR Classification Criteria for SSc

Sjogren's Disease participants that meet the 2016 ACR/EULAR Classification Criteria for Primary Sjogren's Syndrome

All participants - Use of highly effective methods of contraception

Exclusion Criteria:

* Major surgery within 12 weeks prior to dosing or planned within the study
* Recurrent infections or active clinically significant infection
* Active or untreated latent tuberculosis
* Cancer or history of cancer or lymphoproliferative disease within the previous 5 years
* Uncontrolled cardiovascular, pulmonary, renal, hepatic, endocrine, or gastrointestinal disease

Note: Additional, more specific inclusion/exclusion criteria are defined in the protocol.

Where it's running

  • Xencor Investigative Site
    Melbourne, Australia
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.