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MyositisPhase 3ALKIVIA+NCT05979441

A Study to Assess the Long-term Safety and Efficacy of a Subcutaneous Formulation of Efgartigimod in Adults With Active Idiopathic Inflammatory Myopathy

A Phase 3 study testing Efgartigimod PH20 SC in people with Myositis and Active Idiopathic Inflammatory Myopathy, run by argenx at 92 sites in 29 countries.

Enrolling by invitation

Enrolling by invitation. The study team selects and invites participants, usually from an existing group of patients.

Sites and contacts
Official record
Search all trials

Trial summary

The main purpose of this study is to measure the long-term safety and tolerability of efgartigimod PH20 SC in adult participants with Idiopathic Inflammatory Myopathy (IIM) who previously participated in ARGX-113-2007. Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Efgartigimod PH20 SC
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
240 participants
Where
92 sitesin 29 countries
Study dates
12 Sep 2023to Sep 2028
Phase
Phase 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

  • Has completed trial ARGX-113-2007
  • Being capable of providing signed informed consent and complying with protocol requirements
  • Agrees to use contraceptive measures consistent with local regulations and women of childbearing potential must have a negative urine pregnancy test at baseline before receiving the study drug

Who cannot join

  • Intention to have major surgery during the study period or any other medical condition that has arisen since enrollment in study ARGX-113-2007, that in the investigator's opinion, would confound the results of the study or put the participant at undue risk
  • Known hypersensitivity reaction to the study drug or 1 of its excipients
  • Development of any malignancy, either new or recurrent, other than basal cell carcinoma of the skin, regardless of relatedness

Trial locations and contacts

92 sites in 29 countries. Contact the study team or a site near you to ask about taking part.

92 sites in 29 countries

United States18 sites
  • Emory Healthcare - Emory Clinic - Rheumatology

    Atlanta, Georgia, 30322

  • Austin Neuromuscular Center (National Neuromuscular Research Institute, PLLC)

    Austin, Texas, 78759

  • John Hopkins Medicine - Johns Hopkins Myositis Center

    Baltimore, Maryland, 21224-2734

  • Attune Health Research, Inc

    Beverly Hills, California, 90039

  • University of North Carolina (UNC) School of Medicine

    Chapel Hill, North Carolina, 27514

  • Northwestern Medicine - Northwestern Memorial Hospital

    Chicago, Illinois, 60611

  • The Ohio State University

    Columbus, Ohio, 43201

  • UF Health - Rheumatology Medical Specialties Medical Plaza

    Gainesville, Florida, 32610

  • Northwell Health Physician Partners Rheumatology

    Great Neck, New York, 11021

  • Nerve And Muscle Center Of Texas

    Houston, Texas, 77030

  • Mayo Clinic - Florida - Neurology

    Jacksonville, Florida, 32224

  • Yale Cancer Center-Yale University School Of Medicine

    New Haven, Connecticut, 06520

  • UCI Health - ALS and Neuromuscular Center - Neurology

    Orange, California, 92868

  • Neuromuscular Clinical and Research Center - Neurology

    Phoenix, Arizona, 85028

  • University of Pittsburgh Medical Center

    Pittsburgh, Pennsylvania, 15261

  • Oregon Health and Science University

    Portland, Oregon, 97239

  • UCSF Health - ALS and Neurodegenerative Disease Center - Dermatology

    San Francisco, California, 94143

  • University of South Florida (USF) - Morsani Center (USF Health Carol and Frank Morsani Center for Advanced Healthcare)

    Tampa, Florida, 33616

Other trials in United States

China9 sites
  • Peking University Third Hospital

    Beijing, 100191

  • Peking Union Medical College Hospital

    Beijing, 100730

  • Sichuan Provincial Academy of Medical Sciences and Sichuan Provincial People's Hospital

    Chengdu, 610072

  • Nanfang Hospital, Southern Medical University

    Guangzhou, Guangdong, 510515

  • Nanjing University Medical School - Taikang Xianlin Drum Tower Hospital (Nanjing Drum Tower Hospital)

    Nanjing, Jingsu, 210000

  • Shanghai Jiao Tong University School of Medicine - Renji Hospital - Shanghai Institute of Digestive Disease (SIDD)

    Shanghai, 200001

  • Huashan Hospital Affiliated to Fudan University

    Shanghai, 200040

  • China Medical University (CMU) - First Affiliated Hospital

    Shenyang, 110001

  • First Affiliated Hospital (Henan Medical University - First Affiliated Hospital)-Zhengzhou University

    Zhengzhou, 450052

Other trials in China

Italy7 sites
  • Azienda Ospedaliero Universitaria Consorziale Policlinico

    Bari, 70124

  • Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) - Ospedale San Raffaele Hospital

    Milan, 20132

  • Azienda Ospedaliero Universitaria Pisana - Ospedale Santa Chiara - Rheumatology

    Pisa, 56126

  • Ospedale Sant'Andrea Hospital

    Roma, 00189

  • Fondazione Policlinico Universitario Agostino Gemelli - Neurology

    Roma, 168

  • IRCCS Istituto Clinico Humanitas

    Rozzano, 20089

  • Azienda sanitaria universitaria Friuli Centrale - ASUFC

    Udine, 33100

Other trials in Italy

Germany6 sites
  • Charite Universitaetsmedizin Berlin - Campus Charite Mitte (CCM) - Rheumatology

    Berlin, 10117

  • Universitaetsklinikum Hamburg-Eppendorf

    Hamburg, 20246

  • Rheumazentrum Ruhrgebiet

    Herne, 44649

  • Universitatsmedizin Mannheim GmbH

    Mannheim, 68167

  • Universitaetsklinikum Tuebingen (UKT)

    Tübingen, 72076

  • Klinikum der Universitaet Ulm

    Ulm, 89081

Other trials in Germany

Japan6 sites
  • Juntendo University Hospital

    Bunkyō City, 113-8431

  • The University of Tokyo Hospital

    Bunkyō City, 113-8655

  • Japan Community Healthcare Organization Chukyo Hospital

    Nagoya, 457-8510

  • Institute of Science Tokyo Hospital

    Tokyo, 113-8519

  • Wakayama Medical University Hospital

    Wakayama, 641-8510

  • Yamaguchi University Hospital

    Yamaguchi, 755-8505

Other trials in Japan

Thailand5 sites
  • King Chulalongkorn Memorial Hospital - Neurology

    Bangkok, 10330

  • Phramongkutklao Hospital

    Bangkok, 10400

  • Ramathibodi hospital

    Bangkok, 10400

  • Siriraj Hospital, Mahidol University of Internal medicine

    Bangkok, 10700

  • Faculty Of Medicine, Khon Kaen University

    Khon Kaen, 40002

Other trials in Thailand

Georgia4 sites
  • Aversi Clinic

    Tbilisi, 0160

  • LLC MediClub Georgia

    Tbilisi, 0160

  • New Hospitals

    Tbilisi, 0162

  • The First Medical Center

    Tbilisi, 0180

Other trials in Georgia

Argentina3 sites
  • Framingham Centro Medico

    La Plata, B1902COS

  • Centro Dermatologico Schejtman

    San Miguel, B1663GKT

  • Centro Medico Privado de Reumatologia

    San Miguel de Tucumán, 4000

Other trials in Argentina

Greece3 sites
  • National and Kapodistrian University of Athens - School of Health Sciences - Faculty of Medicine

    Athens, 115 27

  • National and Kapodistrian University of Athens - Eginition Hospital

    Athens, 115 28

  • ATTIKON University General Hospital - Neurology

    Athens, 12462

Other trials in Greece

Peru3 sites
  • Clinica San Juan de Dios - sede Arequipa - Rheumatology

    Arequipa, 4000

  • Instituto Peruano Del Hueso Y La Articulacion Sac-Privado-Lima,Centro De Investigacion Iphar

    Lima, 27

  • Investigaciones Clinicas S.A.C.

    Lima, 33

Other trials in Peru

Spain3 sites
  • Hospital de la Santa Creu i Sant Pau

    Barcelona, 08041

  • Hospital Universitario 12 de Octubre

    Madrid, 28041

  • Hospital Universitari i Politecnic La Fe de Valencia - Neurology

    Valencia, 46026

Other trials in Spain

United Kingdom3 sites
  • Aintree University Hospital - Liverpool University Hospitals NHS Foundation Trust

    Liverpool, L9 7AL

  • The Royal Free Hospital

    London, NW3 2QG

  • Northern Care Allicance NHS Foundation Trust - Salford Royal - Rheumatology

    Salford, M6 8HD

Other trials in United Kingdom

Belgium2 sites
  • AZ Sint-Lucas - Campus Sint-Lucas - Neurology

    Ghent, 9000

  • Universitair Ziekenhuis Leuven Gasthuisberg Campus

    Leuven, 3000

Other trials in Belgium

Bulgaria2 sites
  • Medical Centre Artmed

    Plovdiv, 4002

  • Multiprofile hospital for active treatment Kaspela EOOD

    Plovdiv, 4002

Other trials in Bulgaria

Poland2 sites
  • USK-WAM Centralny Szpital Weteranow - Szpital Kniniczny ul. Zeromskiego 113 - Rheumatology

    Lodz, 90-549

  • Centrum Wsparcia Badan Klinicznych Pomorskiego Uniwersytetu Medycznego w Szczecinie (CWBK PUM) - Rheumatology

    Szczecin, 71-252

Other trials in Poland

Serbia2 sites
  • Clinical Center of Serbia

    Belgrade, 11000

  • Institute of Rheumatology

    Belgrade, 11000

Other trials in Serbia

Taiwan2 sites
  • Chung Shan Medical University Hospital

    Taichung, 402

  • Taichung Veterans General Hospital

    Taichung

Other trials in Taiwan

Austria1 site
  • Tirol Kliniken - A.o. Landeskrankenhaus Innsbruck - Neurology

    Innsbruck, 6020

Other trials in Austria

Cyprus1 site
  • Cyprus Institute of Neurology and Genetics

    Nicosia, 2371

Other trials in Cyprus

Czechia1 site
  • Revmatologicky Ustav

    Prague, 12850

Other trials in Czechia

Denmark1 site
  • Copenhagen University Hospital-Rigshospitalet University Hospital

    Copenhagen, 2100

Other trials in Denmark

France1 site
  • Reference Center Neuro-Muscular Diseases - CHU Paris Group Hospitalier La Pitie Salpetriere-Charles Foix

    Paris, 75013

Other trials in France

Ireland1 site
  • University College Dublin (UCD) - St. Vincent's University Hospital (SVUH)

    Dublin, D04 T6F4

Other trials in Ireland

Lithuania1 site
  • Santaros University Clinic

    Vilnius, 08410

Other trials in Lithuania

Mexico1 site
  • Hospital Angeles Clinica Londres

    Mexico City, 06700

Other trials in Mexico

Netherlands1 site
  • Amsterdam UMC Research BV

    Amsterdam, 1105 AZ

Other trials in Netherlands

Portugal1 site
  • Centro Hospitalar do Porto - Hospital Santo Antonio

    Porto, 4099-001

Other trials in Portugal

South Korea1 site
  • Seoul National University Hospital

    Seoul, 03080

Other trials in South Korea

Sweden1 site
  • Karolinska Universitestssjukhus Solna

    Solna, 17176

Other trials in Sweden

About this study

Official title: A Phase 3, Single-Arm, Multicenter, Open-label Extension of Study ARGX-113-2007 to Investigate the Long-term Safety, Tolerability, and Efficacy of Efgartigimod PH20 SC in Participants Aged 18 Years and Older With Active Idiopathic Inflammatory Myopathy

The main purpose of this study is to measure the long-term safety and tolerability of efgartigimod PH20 SC in adult participants with Idiopathic Inflammatory Myopathy (IIM) who previously participated in ARGX-113-2007.

The study consists of a treatment period where participants will receive efgartigimod PH20 SC for up to 51 months. The treatment period will be followed by a treatment-free safety follow-up period of 56 days.

Being tested
Efgartigimod PH20 SC
Medical subject headings
Myositis, Dermatomyositis, Polymyositis, Antisynthetase syndrome

What participants receive

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

  • Efgartigimod PH20 SCBiological

    Subcutaneous injection of Efgartigimod PH20 given by vials or prefilled syringe (PFS)

Study groups in NCT05979441
Study groupRoleWhat they receive
Efgartigimod PH20 SCExperimentalParticipants receiving efgartigimod PH20 subcutaneously
Receives: Biological: Efgartigimod PH20 SC

What is being measured

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

  1. Incidence of AEs, SAEs and AESIs over time

    AE : adverse event ; SAE : serious adverse event ; AESI : adverse event of special interest.

    Measured: Up to 53 months

Secondary outcomes (21)
  1. C-GTI comprising the AIS over time

    The Composite Glucocorticoid Toxicity Index (C-GTI) serves as a primary instrument to capture toxicities likely caused by glucocorticoid exposure and enables monitoring of long-term tolerability of glucocorticoids during prolonged use. The Aggregate Improvement Score (AIS) is an analytical scores generated from the weighted C-GTI. The AIS can be used to assess whether a new therapy is effective in reducing glucocorticoid toxicity over time; higher AIS scores are associated with less toxicity.

    Measured: Up to 51 months

  2. C-GTI comprising the CWS over time

    The Composite Glucocorticoid Toxicity Index (C-GTI) serves as a primary instrument to capture toxicities likely caused by glucocorticoid exposure and enables monitoring of long-term tolerability of glucocorticoids during prolonged use. The Cumulative Worsening Score (CWS) is an analytical score generated from the weighted C-GTI. The CWS is designed to assess cumulative glucocorticoid toxicity; higher scores indicate increased steroid toxicity.

    Measured: Up to 51 months

  3. C-GTI comprising the GTI-MD over time

    The Composite Glucocorticoid Toxicity Index (C-GTI) serves as a primary instrument to capture toxicities likely caused by glucocorticoid exposure and enables monitoring of long-term tolerability of glucocorticoids during prolonged use. The Glucocorticoid Toxicity Index-Metabolic Domains (GTI-MD) is an abbreviated GTI version limited to the 4 metabolic domains. A GTI-MD score of 0 indicates a low likelihood of toxicity in the assessed metabolic domains.

    Measured: Up to 51 months

  4. Prednisone dose reduction (average monthly dose) over time

    Measured: Up to 51 months

  5. TIS over time

    The total improvement score (TIS) assesses minimal, moderate, and major clinical response, and it is assessed using the ACR/EULAR criteria. The total score varies between 0 and 100, with higher scores indicating greater improvement.

    Measured: Up to 51 months

  6. Proportion of TIS responders (minimal, moderate, major) over time

    The total improvement score (TIS) assesses minimal, moderate, and major clinical response, and it is assessed using the ACR/EULAR criteria. The total score varies between 0 and 100, with higher scores indicating greater improvement

    Measured: Up to 51 months

  7. Individual CSMs of the TIS over time

    The total improvement score (TIS) assesses minimal, moderate, and major clinical response, and it is assessed using the ACR/EULAR criteria. The ACR/EULAR criteria calculate TIS using the 6 core set measure (CSMs): MDGA, PGA, MMT8, HAQ-DI, muscle enzymes, and extramuscular global assessment (assessed by the MDAAT).

    Measured: Up to 51 months

  8. Percentage of participants with clinically inactive disease

    Clinically inactive disease is defined as no evidence of disease activity, based on an Physician Global Assessment of Disease Activity (MDGA) and Extramuscular Global Assessment of the Myositis Disease Activity Assessment Tool (MDAAT) of 0 and normal creatine kinase (CK) values for at least 12 weeks (at week 28 and every 24 weeks thereafter).

    Measured: Up to 51 months

  9. Percentage of participants with remission during the study

    Remission is defined as a clinically inactive disease for at least 24 weeks

    Measured: Up to 51 months

  10. PGI-S over time

    The Patient Global Impression of Severity (PGI-S) asks participants to rate the severity of their disease symptoms over the past 7 days on a 4-point Likert scale, where scores range from "no symptoms" to "severe."

    Measured: Up to 51 months

  11. CGI-S over time

    The Clinical Global Impression of Severity (CGI-S) asks the physician to rate the severity of the participant's disease on a 4-point Likert scale, where scores range from "no activity" to "severe".

    Measured: Up to 51 months

  12. Physical Functioning subscale and Physical Component Summary scores of the SF-36v2 over time

    The 36-Item Short Form Survey version 2 (SF-36v2) is a 36-item scale constructed to survey health-related quality of life in 8 domains.

    Measured: Up to 51 months

  13. EQ-5D-5L utilities over time

    The EQ-5D-5L questionnaire is a standardized test recognized by many health authorities as a generic measure of health status for clinical and economic appraisal. The descriptive system comprises 5 dimensions, each having 5 levels ranging from "No problem" to "Extreme problem".

    Measured: Up to 51 months

  14. EQ-5D-5L VAS over time

    The EQ-5D-5L questionnaire is a standardized test recognized by many health authorities as a generic measure of health status for clinical and economic appraisal. A visual analog scale (VAS) is included in the EQ-5D-5L, where participants will mark their health status from 0 (the worst health you can imagine) to 100 (the best health you can imagine).

    Measured: Up to 51 months

  15. Percent change from baseline in total IgG levels in serum over time

    Measured: Up to 53 months

  16. Incidence of ADA against efgartigimod (serum levels) over time

    ADA : anti-drug antibodies.

    Measured: Up to 53 months

  17. Proportion of participants achieving sustained low disease activity while on IMP, over time

    Sustained low disease activity is defined as a CGI-S score of "mild" or "no activity" and a PGI-S score of "mild" or "no symptoms" for at least 12 weeks.

    Measured: Up to 51 months

  18. Proportion of participants with low disease activity over time, while on IMP

    Low disease activity is defined as a CGI-S score of "mild" or "no activity" and a PGI-S score of "mild" or "no symptoms"

    Measured: Up to 51 months

  19. Proportion of participants with low disease activity who continue dosing every 2 weeks at week 52 and every 24 weeks thereafter

    Low disease activity is defined as a CGI-S score of "mild" or "no activity" and a PGI-S score of "mild" or "no symptoms"

    Measured: Up to 51 months

  20. Proportion of participants who have marked worsening during the period of dosing every 2 weeks

    Marked worsening is defined as a CGI-S score of "moderate" or "severe" and a PGI-S score of "moderate" or "severe"

    Measured: Up to 51 months

  21. Duration of dosing every 2 weeks

    Measured: Up to 51 months

Timeline

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

  1. First posted7 Aug 2023
  2. Study start12 Sep 2023
  3. Primary completionSep 2028 (estimated)
  4. Study completionSep 2028 (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 3
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
240 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05979441
Sponsor's protocol ID
ARGX-113-2011
Other IDs
2022-502851-79-00
Acronym
ALKIVIA+
Status last verified
Jul 2026
First submitted
28 Jul 2023
Last updated
16 Oct 2026
Results posted
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Undecided

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing Efgartigimod PH20 SC in people with Myositis and Active Idiopathic Inflammatory Myopathy, run by argenx at 92 sites in 29 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 3 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: enrolling by invitation, as of the sponsor's last update on 16 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 92 sites in United States, China, Italy, Germany, Japan and 24 more countries. 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 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?

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?

Incidence of AEs, SAEs and AESIs over time (time frame: Up to 53 months). 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 16 Oct 2026.

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