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Primary Sjögren's SyndromePhase 2Rho plusNCT06203457

Open-Label Extension Study to Evaluate the Safety of Efgartigimod in Adult Patients With Primary Sjögren's Syndrome

A Phase 2 study testing Efgartigimod in people with Primary Sjögren's Syndrome, run by argenx at 11 sites in 3 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Efgartigimod has the potential to improve disease manifestations by the reduction of IgG autoantibodies in Sjogren's Syndrome (SjD or pSS). This open-label extension study will evaluate the long-term safety of efgartigimod in participants with SjD who have completed the treatment period of the qualifying efgartigimod… Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Primary Sjögren's Syndrome
What is being tested?
Efgartigimod
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
24 participants
Where
11 sitesin 3 countries
Study dates
29 Nov 2023to 3 Feb 2025
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 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Is at least the legal age of consent for clinical trials when signing the ICF
  • Is capable of providing signed informed consent and complying with protocol requirements
  • Agrees to use contraceptive measures consistent with local regulations and the following: WOCBP must have a negative urine pregnancy test at baseline before receiving IMP
  • Has completed the qualifying efgartigimod SjD studies and agrees to continue study drug treatment without interruption in the extension study

Who cannot join

  • Clinically significant disease (including newly diagnosed malignancy or cardiovascular disease) or intention to have surgery during the study; or any other medical condition that, in the investigator's opinion, would confound the results of the study or put the participant at undue risk
  • Pregnant or intention to become pregnant during the study
  • Any severe systemic SjD manifestation that may put the participant at undue risk based on the investigator's opinion

Trial locations and contacts

11 sites in 3 countries.

11 sites in 3 countries

Poland8 sites
  • MCBK SC

    Grodzisk Mazowiecki, 05 825

  • Centrum Medyczne Plejady

    Krakow, 30 363

  • Clinical Research Center Spółka z ograniczoną odpowiedzialnością Medic-R Sp.k.

    Poznan, 60-848

  • Centrum Medyczne Pratia Poznan

    Skorzewo, 60 185

  • MICS Centrum Medyczne Warszawa

    Warsaw, 00 874

  • Klinika Reuma Park Sp zoo Sp K

    Warsaw, 02 665

  • Narodowy Instytut Geriatrii

    Warsaw, 02637

  • FutureMeds sp zoo

    Wroclaw, 50 088

Other trials in Poland

Hungary2 sites
  • Debreceni Egyetem

    Debrecen, 4032

  • Vita Verum Medical Egeszsegugyi Szolgaltato Bt.

    Székesfehérvár, 8000

Other trials in Hungary

Belgium1 site
  • Universitair Ziekenhuis Gent

    Ghent, 9000

Other trials in Belgium

About this study

Official title: Open-Label Extension Study to Evaluate the Safety of Efgartigimod in Adult Patients With Primary Sjögren's Syndrome (pSS) Who Complete Qualifying Efgartigimod pSS Studies

Efgartigimod has the potential to improve disease manifestations by the reduction of IgG autoantibodies in Sjogren's Syndrome (SjD or pSS). This open-label extension study will evaluate the long-term safety of efgartigimod in participants with SjD who have completed the treatment period of the qualifying efgartigimod study (ARGX-113-2106).

Being tested
Efgartigimod

What participants receive

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

  • EfgartigimodBiological

    Patients receiving efgartigimod infusions

Study groups in NCT06203457
Study groupRoleWhat they receive
EfgartigimodExperimentalAll participants received efgartigimod 10 mg/kg via intravenous infusion once weekly or once every 2 weeks for up to 48 weeks in this study.
Receives: Biological: Efgartigimod

What is being measured

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

  1. Number of Participants With TEAEs, TESAEs and TEAESIs

    An adverse event (AE) was any untoward medical occurrence in a clinical study participant, temporally associated with the use of study drug, whether or not considered related to the study drug. A serious adverse event (SAE) was any untoward medical occurrence that, at any dose: resulted in death, was life threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect or any other medically important event. Treatment-emergent adverse events (TEAEs) were defined as AEs with onset on or after the first administration of study drug up to and including 60 days after the last study drug administration. Adverse events in the 'Infections and infestations' SOC were defined as AE of Special Interest (AESIs) because efgartigimod causes a transient reduction in total IgG levels.

    Measured: From the first dose of study drug (Day 1) up to 60 days post last study drug, approximately 56 weeks

Secondary outcomes (14)
  1. Number of CRESS Responders at Weeks 24 and 48

    A composite of relevant endpoints for Sjögren's syndrome (CRESS) measures systemic disease activity, patient-reported symptoms, tear gland function, salivary gland function, and serology, developed to assess treatment efficacy in participants with SjD. A responder is defined as improvement in at least 3 of the above mentioned 5 items of CRESS. The score ranges from 0 to 9 (higher score = worse symptoms). Responder rates for the efgartigimod-efgartigimod group in the follow-up study are supplemental to those in the antecedent study (ARGX-113-2106). Because responders from the ARGX-113-2106 study (mainly in the efgartigimod-efgartigimod group) potentially started the ARGX-113-2211 with lower baseline scores, further improvement on this efficacy measure is inherently challenging due to clinical and biological limitations.

    Measured: Weeks 24 and 48

  2. Number of Participants With Minimal Clinically Important Improvement From Baseline in ESSDAI at Weeks 24 and 48

    European alliance of associations for rheumatology (EULAR) SjD activity index (ESSDAI) measures systemic disease activity in 12 domains. The activity levels of each domain are multiplied by their respective weights to obtain the total score between 0 and 123 (higher score = worse symptoms). Minimally clinically important improvement in ESSDAI was defined as improvement of at least 3 points in ESSDAI score at Weeks 24 and 48. Baseline was defined as the last available non-missing measurement from the parent study ARGX-113-2106. Responder rates for the efg-efg group in the follow-up study are supplemental to those in the ARGX-113-2106 study. Because responders from the ARGX-113-2106 study (mainly in the efg-efg group) potentially started the ARGX-113-2211 with lower baseline scores, further improvement on this efficacy measure is inherently challenging due to clinical and biological limitations.

    Measured: Baseline (Day 1) and Weeks 24 and 48

  3. Number of Participants With Low Disease Activity in ESSDAI at Weeks 24 and 48

    ESSDAI measures systemic disease activity in participants with SjD and consists of 12 domains. The activity levels of each domain (range: 0-3 points) are multiplied by their respective weights (range: 1-6 points) to obtain the total score between 0 and 123 (higher score = worse symptoms). Low disease activity in ESSDAI was defined as ESSDAI score of less than 5 at Weeks 24 and 48. Responder rates for the efgartigimod-efgartigimod group in the follow-up study are supplemental to those in the antecedent study (ARGX-113-2106). Because responders from the ARGX-113-2106 study (mainly in the efgartigimod-efgartigimod group) potentially started the ARGX-113-2211 with lower baseline scores, further improvement on this efficacy measure is inherently challenging due to clinical and biological limitations.

    Measured: Weeks 24 and 48

  4. Number of Participants With Minimal Clinically Important Improvement From Baseline in clinESSDAI at Weeks 24 and 48

    Clinical EULAR Sjögren's syndrome disease activity index (clinESSDAI) includes same 11 organ-specific domains as ESSDAI but with different domain weighting and this scale does not have biological domain.This way any change in clinESSDAI score reflects disease specific features irrespective of B-cell activity. clinESSDAI score ranges between 0-135 (higher score=worse symptoms).Minimal clinically important improvement in clinESSDAI was defined as improvement of at least 3 points in clinESSDAI score at Weeks 24 and 48.Baseline=last available non-missing measurement from parent study ARGX-113-2106.Responder rates for efgartigimod-efgartigimod group in follow-up study are supplemental to those in antecedent study (ARGX-113-2106).Because responders from ARGX-113-2106 study (mainly in efgartigimod-efgartigimod group) potentially started ARGX-113-2211 with lower baseline scores,further improvement on this efficacy measure is inherently challenging due to clinical and biological limitations.

    Measured: Baseline (Day 1) and Weeks 24 and 48

  5. Number of Participants With Low Disease Activity in clinESSDAI at Weeks 24 and 48

    clinESSDAI includes the same 11 organ-specific domains as ESSDAI but with different domain weighting and this scale does not have the biological domain. This way any change in clinESSDAI score reflects disease specific features irrespective of B-cell activity. The clinESSDAI score ranges between 0-135 (higher score = worse symptoms). Low disease activity in clinESSDAI was defined as clinESSDAI score of less than 5 at Weeks 24 and 48. Responder rates for the efgartigimod-efgartigimod group in the follow-up study are supplemental to those in the antecedent study (ARGX-113-2106). Because responders from the ARGX-113-2106 study (mainly in the efgartigimod-efgartigimod group) potentially started the ARGX-113-2211 with lower baseline scores, further improvement on this efficacy measure is inherently challenging due to clinical and biological limitations.

    Measured: Weeks 24 and 48

  6. Number of Participants With Minimal Clinically Important Improvement From Baseline in ESSPRI at Weeks 24 and 48

    EULAR Sjögren's syndrome patient-reported index (ESSPRI) is a questionnaire developed to measure self-reported symptoms in participants with SjD and consists of 3 items that measure dryness, fatigue, and pain. The total global score ranges from 0 to 10 by averaging the numeric scores for pain, fatigue, and dryness, with higher scores indicating more symptoms. Minimal clinically important improvement in ESSPRI was defined as decrease of 1 point or at least >=15% at Weeks 24 and 48. Baseline was defined as the last available non-missing measurement from the study ARGX-113-2106. Responder rates for the efg-efg group in the follow-up study are supplemental to those in the ARGX-113-2106 study. Because responders from the ARGX-113-2106 study (mainly in the efg-efg group) potentially started the ARGX-113-2211 with lower baseline scores, further improvement on this measure is inherently challenging due to biological and clinical limitations.

    Measured: Baseline (Day 1) and Weeks 24 and 48

  7. Change From Baseline in ESSDAI Score at Weeks 24 and 48

    ESSDAI measures systemic disease activity in participants with SjD and consists of 12 domains: 11 organ-specific domains (cutaneous, pulmonary, renal, articular, muscular, peripheral nervous system, central nervous system, hematological, glandular, constitutional, and lymphadenopathic) and 1 biological domain reflecting B-cell activity that contributes to disease activity level scoring. The activity levels of each domain (range: 0-3 points) are multiplied by their respective weights (range: 1-6 points) to obtain the total score between 0 and 123 (higher score = worse symptoms). Baseline was defined as the last available non-missing measurement from the parent study ARGX-113-2106.

    Measured: Baseline (Day 1) and Weeks 24 and 48

  8. Change From Baseline in clinESSDAI Score at Weeks 24 and 48

    clinESSDAI includes the same 11 organ-specific domains as ESSDAI but with different domain weighting and this scale does not have the biological domain. This way any change in clinESSDAI score reflects disease specific features irrespective of B-cell activity. The clinESSDAI score ranges between 0-135 (higher score = worse symptoms). Baseline was defined as the last available non-missing measurement from the parent study ARGX-113-2106.

    Measured: Baseline (Day 1) and Weeks 24 and 48

  9. Change From Baseline in ESSPRI Score at Weeks 24 and 48

    ESSPRI is a questionnaire developed to measure self-reported symptoms in participants with SjD and consists of 3 items that measure dryness, fatigue, and pain. Each item includes a numeric rating scale ranging from 0: no symptoms (dryness, fatigue, or pain) to 10: maximal imaginable (dryness, fatigue, or pain). The total global score ranges from 0 to 10 and the ESSPRI is calculated by averaging the numeric scores for pain, fatigue, and dryness, with higher scores indicating more symptoms. Baseline was defined as the last available non-missing measurement from the parent study ARGX-113-2106.

    Measured: Baseline (Day 1) and Weeks 24 and 48

  10. Number of STAR Responders at Weeks 24 and 48

    Sjögren's tool for assessing response (STAR) is a composite endpoint assessing multiple clinically relevant disease features. A STAR responder is defined as a participant with a score of at least 5 points. Due to the weighting, participant must be a responder on either systemic disease activity (ESSDAI), patient-reported symptoms (ESSPRI), or both to be an overall STAR responder. The score ranges between 0 and 9 (higher score = worse outcome). Responder rates for the efgartigimod-efgartigimod group in the follow-up study are supplemental to those in the antecedent study (ARGX-113-2106). Because responders from the ARGX-113-2106 study (mainly in the efgartigimod-efgartigimod group) potentially started the ARGX-113-2211 with lower baseline scores, further improvement on this efficacy measure is inherently challenging due to clinical and biological limitations.

    Measured: Weeks 24 and 48

  11. Percent Change From Baseline in Total IgG Levels in Serum at Week 48

    Blood samples were collected at indicated timepoints to assess the total Immunoglobulin (Ig)G levels in serum. Total IgG concentrations were quantified using validated methods at a diagnostical laboratory. Baseline was defined as the last available non-missing measurement from the parent study ARGX-113-2106.

    Measured: Baseline (Day 1) and Week 48

  12. Percent Change From Baseline in Autoantibodies in Serum at Week 48

    Blood samples were collected at indicated timepoints to assess serum autoantibodies: anti-Ro/Sjögren's syndrome-related antigen A (SS-A) and anti-La/Sjögren's syndrome-related antigen B (SS-B). Baseline was defined as the last available non-missing measurement from the parent study ARGX-113-2106.

    Measured: Baseline (Day 1) and Week 48

  13. Serum Concentrations of Efgartigimod

    Serum samples were collected at indicated timepoints to assess the pharmacokinetic (PK) profile of efgartigimod.

    Measured: Pre-dose and post-dose at Baseline (Day 1) and pre-dose at Weeks 24 and 48

  14. Number of Participants With ADA Against Efgartigimod Over the 48-week Treatment Period

    Blood samples were collected to assess anti-drug antibodies (ADAs) against efgartigimod. Samples were analyzed by the designated laboratory in a 3-tiered approach using validated immunogenicity assays. ADA incidence included total number of participants with treatment-boosted and treatment-induced ADA. Treatment-boosted ADA was defined as participants who had a baseline positive sample and the titer value increased 4-fold or more compared to baseline. Treatment-induced ADA was defined as participants who had a baseline negative sample and at least 1 positive post-baseline samples. Number of participants with ADA incidence is presented here.

    Measured: From Baseline (Day 1) up to 48 weeks

Timeline

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

  1. First posted12 Jan 2024
  2. Study start29 Nov 2023
  3. Primary completion3 Feb 2025
  4. Study completion3 Feb 2025

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
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
24 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06203457
Sponsor's protocol ID
ARGX-113-2211
Acronym
Rho plus
Status last verified
Apr 2025
First submitted
16 Nov 2023
Last updated
20 Feb 2026
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Efgartigimod in people with Primary Sjögren's Syndrome, run by argenx at 11 sites in 3 countries.

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 4 inclusion and 3 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 20 Feb 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 11 sites in Poland, Hungary, Belgium. 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 20 Feb 2026). 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?

Number of Participants With TEAEs, TESAEs and TEAESIs (time frame: From the first dose of study drug (Day 1) up to 60 days post last study drug, approximately 56 weeks). 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 20 Feb 2026.

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