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Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)Phase 2ADHERE+NCT04280718

A Study to Assess the Long-term Safety and Efficacy of a Subcutaneous Formulation of Efgartigimod in Adults With Chronic Inflammatory Demyelinating Polyneuropathy (CIDP, an Autoimmune Disorder That Affects the Peripheral Nerves)

A Phase 2 study testing Efgartigimod PH20 SC in people with Chronic Inflammatory Demyelinating Polyneuropathy (CIDP), run by argenx at 147 sites in 24 countries.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
Search all trials

Trial summary

This is the open-label extension study of phase II ARGX-113-1802 to evaluate the long-term safety and efficacy of the subcutaneous formulation of efgartigimod in adults with CIDP. 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
229 participants
Where
147 sitesin 24 countries
Study dates
18 Sep 2020to 30 Apr 2027
Phase
Phase 2
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

  • Ability to understand the requirements of the trial, provide written informed consent (including consent for the use and disclosure of research-related health information), willingness and ability to comply with the trial protocol procedures (including required trial visits) of this trial.
  • Male or female patient with one of the following options:
  • Have completed the Week-48 visit of Stage B of the ARGX-113-1802 trial and are considered to be eligible for treatment with efgartigimod PH20 SC; or
  • Have deteriorated during Stage B of the ARGX-113-1802 trial and are considered to be eligible for treatment with efgartigimod PH20 SC, or
  • Have been offered the participation in the OLE trial due to early termination of the ARGX-113-1802 trial (because sufficient events for the primary endpoint analysis of the that trial have been reached and it is stopped) and are considered to be eligible for treatment with efgartigimod PH20 SC treatment; or
  • Have completed the Week-48 visit of the previous cycle of the OLE trial and are considered to be eligible to continue with efgartigimod PH20 SC treatment.
  • Women of childbearing potential who have a negative urine pregnancy test at baseline before IMP administration.
  • Women of childbearing potential must use an acceptable method of contraception from signing the ICF until the date of the last administration of IMP.

Who cannot join

  • Week-48/ED visit in the ARGX-113-1802 trial or the Week-48 visit of the previous OLE participation occurred more than 14 days prior to SD1 of the OLE trial or the start of a new treatment cycle in the OLE trial and more than 21 days since the last dose of IMP.
  • Pregnant and lactating women and those intending to become pregnant during the trial.
  • Patients with clinical evidence of other significant serious disease or patients who underwent a recent or have a planned major surgery, or patients who (intend to) use prohibited medications (see protocol) and therapies during the trial, or any other reason which could confound the results of the trial or put the patient at undue risk.

Trial locations and contacts

147 sites in 24 countries.

147 sites in 24 countries

United States25 sites
  • Investigator Site 0010066

    Austin, Texas, 78756

  • Investigator site 0010065

    Birmingham, Alabama, 35233-2110

  • Investigator site 0010072

    Boca Raton, Florida, 33487

  • Investigator site 0010032

    Carlsbad, California, 92011

  • Investigator site 0010057

    Centennial, Colorado, 80112

  • Investigator site 0010003

    Chapel Hill, North Carolina, 27517

  • Investigator site 0010064

    Columbus, Ohio, 43210

  • Investigator site 0010144

    Coral Springs, Florida, 33067-4640

  • Investigator site 0010015

    Fairway, Kansas, 66205

  • Investigator site 0010011

    Iowa City, Iowa, 52242

  • Investigator site 0010023

    Jacksonville, Florida, 32209

  • Investigator site 10147

    Lexington, Kentucky, 40536

  • Investigator site 0010068

    Maitland, Florida, 32751

  • Investigator site 0010059

    Miami, Florida, 33136

  • Investigator site 10168

    New York, New York, 10016

  • Investigator site 0010007

    Philadelphia, Pennsylvania, 19107

  • Investigator site 0010047

    Philadelphia, Pennsylvania, 19126

  • Investigator site 0010013

    Phoenix, Arizona, 85018

  • Investigator site 10190

    Pomona, California, 91767-2009

  • Investigator site 0010160

    Rancho Mirage, California, 92270-4150

  • Investigator site 0010061

    Richmond, Virginia, 23298

  • Investigator site 0010009

    San Antonio, Texas, 78229

  • Investigator site 0010071

    San Francisco, California, 94109

  • Investigator site 0010055

    Scottsdale, Arizona, 85028

  • Investigator site 0010006

    Tampa, Florida, 33612

Other trials in United States

China19 sites
  • Investigator site 0860033

    Beijing

  • Investigator site 860041

    Changsha

  • Investigator site 0860036

    Chengdu

  • Investigator site 860049

    Chifeng, 024000

  • Investigator site 0860038

    Fuzhou

  • Investigator site 0860050

    Guangzhou, 510120

  • Investigator site 0860032

    Guanzhou

  • Investigator site 0860045

    Guiyang

  • Investigator site 0860035

    Hangzhou, 310003

  • Investigator site 0860031

    Jinan, 250012

  • Investigator site 0860040

    Nanchang, 33008

  • Investigator site 0860043

    Nanjing

  • Investigator site 0860028

    Shanghai

  • Investigator site 860047

    Shanghai

  • Investigator site 0860042

    Tianjin

  • Investigator site 0860034

    Wuhan, 430040

  • Investigator site 0860029

    Wuhan, 430060

  • Investigator site 0860048

    Xi'an, 710038

  • Investigator site 0860054

    Xianyang, 712000

Other trials in China

Japan18 sites
  • Investigator site 0810035

    Bunkyō City

  • Investigator site 0810002

    Chiba

  • Investigator site 0810030

    Fuchū, 183-0042

  • Investigator site 0810031

    Fukuoka, 812-8582

  • Investigator site 0810065

    Ginowan

  • Investigator site 0810066

    Hakodate

  • Investigator site 0810058

    Hiroshima

  • Investigator site 0810029

    Kawagoe

  • Investigator site 0810026

    Kodaira, 187-8551

  • Investigator site 810061

    Kyoto, 616-8255

  • Investigator site 0810027

    Mibu, 321-0293

  • Investigator site 0810032

    Nagoya, 466-8560

  • Investigator site 0810003

    Osaka, 565-0871

  • Investigator site 0810007

    Osaka, 589-8511

  • Investigator site 0810063

    Suita, 565-0871

  • Investigator site 0810036

    tabashi City, 173-8606

  • Investigator site 0810064

    Tokushima

  • Investigator site 0810060

    Yokohama

Other trials in Japan

France9 sites
  • Investigator site 00330034

    Angers

  • Investigator site 0330013

    Bordeaux, 33076

  • Investigator site 330033

    Clermont-Ferrand, 63003

  • Investigator site 0330023

    Le Kremlin-Bicêtre, 94275

  • Investigator site 0330024

    Limoges, 87042

  • Investigator site 330022

    Nantes, 44093

  • Investigator site 0330021

    Nice, 06202

  • Investigator site 0330035

    Paris

  • Investigator site 0330020

    Strasbourg, 67098

Other trials in France

Italy9 sites
  • Investigator site 0390022

    Brescia

  • Investigator site 390029

    Florence, 50139

  • Investigator site 0390024

    Genova, 16132

  • Investigator site 390027

    Messina, 98125

  • Investigator site 0390003

    Milan, 20122

  • Investigator site 0390026

    Milan

  • Investigator site 0390023

    Pisa, 56125

  • Investigator site 0390008

    Roma, 00189

  • Investigator site 0390042

    Torino

Other trials in Italy

Russia7 sites
  • Investigator site 070017

    Kazan', 420021

  • Investigator site 0070023

    Kazan', 420097

  • Investigator site 0070020

    Moscow, 117186

  • Investigator site 70021

    Moscow, 117186

  • Investigator site 0070019

    Rostov-on-Don, 344022

  • Investigator site 0070014

    Saint Petersburg, 194354

  • Investigator site 0070021

    Saransk, 430032

Other trials in Russia

Germany6 sites
  • Investigator site 490044

    Bochum, 44791

  • Investigator site 0490013

    Cologne

  • Investigator site 490045

    Essen, 45147

  • Investigator site 490021

    Göttingen, 37075

  • Investigator site 0490016

    Kiel, 24105

  • Investigator site 0490019

    Potsdam

Other trials in Germany

Georgia5 sites
  • Investigator site 9950020

    Kutaisi, 4600

  • Investigator site 9950004

    Tbilisi, 0112

  • Investigator site 9950005

    Tbilisi, 0112

  • Investigator site 9950002

    Tbilisi

  • Investigator Site 9950003

    Tbilisi

Other trials in Georgia

Poland5 sites
  • Investigator site 0480024

    Krakow, 31-202

  • Investigator site 0480018

    Krakow, 31-539

  • Investigator site 0480020

    Lodz, 90-324

  • Investigator Site 0480017

    Lublin, 20-093

  • Investigator site 0480022

    Warsaw, 07-097

Other trials in Poland

Ukraine5 sites
  • Investigator Site 3800012

    Dnipro, 49069

  • Investigator Site 3800010

    Ivano-Frankivsk, 76008

  • Investigator site 3100013

    Kyiv, 02000

  • Investigator site 3800008

    Lutsk, 43024

  • Investigator site 3800011

    Zaporizhzhya, 69068

Other trials in Ukraine

Belgium4 sites
  • Investigator site 0320016

    Edegem

  • Investigator site 0320009

    Leuven, 3000

  • Investigator site 320024

    Liège, 4000

  • Investigator site 320022

    Woluwe-Saint-Lambert, 1200

Other trials in Belgium

Bulgaria4 sites
  • Investigator site 3590007

    Pleven, 5800

  • Investigator site 3590005

    Sofia, 1113

  • Investigator site 3590008

    Sofia, 1431

  • Investigator site 3590006

    Sofia, 1680

Other trials in Bulgaria

Romania4 sites
  • Investigator site 040002

    Brasov, 500299

  • Investigator site 040001

    Bucharest, 011302

  • Investigator site 040004

    Constanța, 900591

  • Investigator site 040003

    Timișoara, 300723

Other trials in Romania

Taiwan4 sites
  • Investigator site 8860013

    Tainan, 701

  • Investigator site 8860012

    Taipei, 116

  • Investigator site 8860016

    Taipei, 116

  • Investigator site 8860017

    Taoyuan, 333

Other trials in Taiwan

Austria3 sites
  • Investigator site 0430007

    Innsbruck

  • Investigator site 0430008

    Linz, 4021

  • Investigator site 0430005

    Vienna, 1090

Other trials in Austria

Denmark3 sites
  • Investigator site 0450002

    Aarhus, 8200

  • Investigator site 0450001

    Copenhagen, 2100

  • Investigator site 0450003

    Odense, 5000

Other trials in Denmark

Serbia3 sites
  • Investigator site 3810001

    Belgrade, 11000

  • Investigator site 3810003

    Belgrade, 11000

  • Investigator site 3810004

    Kragujevac

Other trials in Serbia

Spain3 sites
  • Investigator site 0340021

    Badalona, 08035

  • Investigator site 0340038

    Barcelona

  • Investigator site 0340018

    Madrid, 28040

Other trials in Spain

Turkey (Türkiye)3 sites
  • Investigator site 900025

    Bursa, 16059

  • Investigator site 900021

    Izmir

  • Investigator site 900022

    Samsun, 55239

Other trials in Turkey (Türkiye)

United Kingdom3 sites
  • Investigator site 440026

    London

  • Investigator site 0440016

    Oxford

  • Investigator site 0440018

    Sheffield

Other trials in United Kingdom

Netherlands2 sites
  • Investigator site 0310010

    Amsterdam, 1105

  • Investigator site 0310011

    Rotterdam, 3015

Other trials in Netherlands

Czechia1 site
  • Investigator site 4200010

    Hradec Králové, 500-03

Other trials in Czechia

Israel1 site
  • Investigator site 9720004

    Tel Aviv, 6423906

Other trials in Israel

Latvia1 site
  • Investigator site 31

    Riga, 1038

Other trials in Latvia

About this study

Official title: Open-label Extension of the ARGX-113-1802 Trial to Investigate the Long-term Safety, Tolerability, and Efficacy of Efgartigimod PH20 SC in Patients With Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)

This is the open-label extension study of phase II ARGX-113-1802 to evaluate the long-term safety and efficacy of the subcutaneous formulation of efgartigimod in adults with CIDP.

Patients already stabilized on efgartigimod PH20 SC will also have the opportunity to participate in a sub study to explore less frequent dosing of efgartigimod PH20 SC.

Being tested
Efgartigimod PH20 SC
Medical subject headings
Polyradiculoneuropathy, Chronic Inflammatory Demyelinating

What participants receive

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

  • Efgartigimod PH20 SCBiological

    Also called ARGX-113

    Subcutaneous administration of efgartigimod

Study groups in NCT04280718
Study groupRoleWhat they receive
efgartigimod PH20 SCExperimentalPatients treated with efgartigimod PH20 SC
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 treatment-emergent adverse events and serious adverse events

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

Secondary outcomes (16)
  1. Change from baseline over time of the adjusted INCAT score

    The Adjusted Inflammatory Neuropathy Cause and Treatment Disability Score (aINCAT) score is a 10-point scale that covers the functionality of legs and arms. The score varies between 0 and 10 (higher score, worse outcome).

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  2. Change from baseline over time of the MRC Sum score

    The Medical Research Council Sum Score evaluates motor strength. Evaluated on 6 muscle groups on each side, the score varies from 0 to 60 (lower score, worse outcome).

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  3. Change from baseline over time of I-RODS disability scores

    Inflammatory Rasch-built Overall Disability Scale (I-RODS) assesses the limitations of activities and social participation in patients with inflammatory neuropathies like CIDP. The score ranges from 0 to 100 (higher score, worse outcome).

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  4. Change from baseline over time of mean grip strength

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  5. Change from baseline over time of TUG score

    The Timed Up and Go Test (TUG) is a simple test to assess a person's mobility in which the time expended to rise from a chair, walk 3 meters, turn around, walk back to the chair, and sit down is measured.

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  6. Percentage of patients without clinical deterioration over time, defined by adjusted INCAT deterioration ≥1 point compared to baseline.

    The Adjusted Inflammatory Neuropathy Cause and Treatment Disability Score (aINCAT) score is a 10-point scale that covers the functionality of legs and arms. The score varies between 0 and 10 (higher score, worse outcome).

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  7. Percentage of patients with titers of binding antibodies towards efgartigimod and the presence of neutralizing antibodies against efgartigimod.

    Measured: Up to 51 weeks

  8. Efgartigimod serum concentrations

    Measured: Up to 51 weeks

  9. Changes from baseline over time of serum IgG levels (total)

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  10. Change from baseline over time in EQ-5D-5L

    EQ-5D-5L questionnaire is a patient-reported outcome measure, ranging 0 to 100 (lower score, worse outcome).

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  11. Change from baseline over time in BPI SF

    The Brief Pain Inventory-Short Form (BPI-SF) is a patient-reported outcome measure to assess pain severity and pain interference

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  12. Change from baseline over time in TSQM-9

    The Treatment Satisfaction Questionnaire for Medication (TSQM) is a 9-item questionnaire to assess treatment satisfaction in naturalistic study designs, in which there is potential that the administration of the side effects domain of the TSQM would interfere with routine clinical care

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  13. Change from baseline over time in RT-FSS

    The Rasch-Transformed Fatigue Severity Scale (RT-FSS) is a 7-item self-reported questionnaire designed to differentiate fatigue from clinical depression. The participant has to rate from 0 to 3 their level of fatigue on 7 items (low score indicates that the statement is not very appropriate, and high score indicates agreement).

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  14. Change from baseline over time in HADS

    The Hospital Anxiety and Depression Scale (HADS) aims to measure symptoms of anxiety and depression in people with physical health problems. HADS is a 14-item scale with 7 items related to anxiety and 7 to depression

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  15. Percentage of patients performing self-administration over time

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

  16. Percentage of patients with treatment administered by caregiver over time.

    Measured: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study

Timeline

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

  1. First posted21 Feb 2020
  2. Study start18 Sep 2020
  3. Primary completion30 Apr 2027 (estimated)
  4. Study completion30 Apr 2027 (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
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
229 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04280718
Sponsor's protocol ID
ARGX-113-1902
Other IDs
2019-003107-35, 2019
Acronym
ADHERE+
Status last verified
Jun 2025
First submitted
20 Feb 2020
Last updated
29 Jun 2025
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Undecided

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Efgartigimod PH20 SC in people with Chronic Inflammatory Demyelinating Polyneuropathy (CIDP), run by argenx at 147 sites in 24 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 8 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: under way, not looking for participants, as of the sponsor's last update on 29 Jun 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 147 sites in United States, China, Japan, France, Italy and 19 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 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?

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 treatment-emergent adverse events and serious adverse events (time frame: Up to 48 weeks per cycle (each cycle is 48 weeks) until the end of the study). 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 29 Jun 2025.

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