Deze pagina is automatisch vertaald en de nauwkeurigheid van de vertaling kan niet worden gegarandeerd. Raadpleeg de Engelse versie voor een brontekst.

A Study to Learn About How Well the Medicine Efgartigimod Works to Treat Autoimmune Encephalitis In Children 12 Years or Older and Adults (Polaris)

7 mei 2026 bijgewerkt door: argenx

A Global, Multicenter, Randomized, Double-Blinded, Placebo-Controlled, Phase 2 Study to Evaluate the Efficacy, Safety, and Tolerability of Efgartigimod PH20 SC in Adult and Adolescent Participants With Autoimmune Encephalitis

The POLARIS study is designed to evaluate how well efgartigimod PH20 SC may work (called "efficacy") and how safe it is for people diagnosed with Autoimmune Encephalitis (AIE). The study consists of 4 parts: in part A participants will receive efgartigimod SC; in part B, participants will be randomized to receive either efgartigimod SC or placebo; in part C, participants who completed part B will receive efgartigimod SC; in part D, participants who completed part C will be observed after their last dose of efgartigimod SC. If AIE symptoms return, efgartigimod SC treatment may be restarted during this time.

The maximum overall study duration for participants is up to 3 years. More information can be found in clinicaltrials.argenx.com/polaris

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

The study is designed to address the unmet need for effective immunomodulatory therapy in AIE, enrolling patients across multiple antibody-defined subgroups, with the anti-NMDAR encephalitis group serving as the primary cohort for statistical analysis.

Studietype

Ingrijpend

Inschrijving (Geschat)

170

Fase

  • Fase 2

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Kind
  • Volwassen
  • Oudere volwassene

Accepteert gezonde vrijwilligers

Nee

Beschrijving

Inclusion Criteria:

  • Is at least 12 years of age.
  • Meeting at least the criteria for possible AIE according to the Graus criteria.
  • Part A:

Must not have received prior treatment for AIE with PLEX or Ig (participants may have received glucocorticoids); and must not have received PLEX or Ig for any other medical condition in the last 3 months

- Part B: Either completing Part A, or If directly entering Part B, must have received first-line treatment for AIE (i.e. corticosteroids, PLEX, and/or Ig) and have a CASE score of 3 or higher, or a score of 2 or higher in a single sub-item

Exclusion Criteria:

  • Known anti-myelin oligodendrocyte glycoprotein (anti-MOG) antibody positivity.
  • Any medical condition that would interfere with an accurate assessment of clinical symptoms of AIE.
  • Recent major surgery (within 3 months of screening) or intention to have major surgery during the study, except for surgeries for AIE-related teratomas and thymomas.
  • History (within 12 months before screening) of current alcohol, drug (including recreational or prescribed cannabinoids), or medication abuse.
  • Psychiatric or cognitive impairment unrelated to AIE.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Verdrievoudigen

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Part A (Open-Label Lead-in Period): Efgartigimod PH20 SC
All participants will receive efgartigimod PH20 SC open label for 8 weeks
Biologisch: Efgartigimod PH20 (ARGX-113) SC
subcutaneous administrations of efgartigimod PH20 SC given by prefilled syringe (PFS). For participants aged 12 to <18 years with body weight ≤50 kg, the study drug will be administered by vial and syringe.
Experimenteel: Part B (Double-blinded treatment period): Efgartigimod PH20 SC
Participants will receive efgartigimod PH20 SC for 24 weeks
Biologisch: Efgartigimod PH20 (ARGX-113) SC
subcutaneous administrations of efgartigimod PH20 SC given by prefilled syringe (PFS). For participants aged 12 to <18 years with body weight ≤50 kg, the study drug will be administered by vial and syringe.
Placebo-vergelijker: Part B (Maintenance double-blinded treatment period): Placebo PH20 SC
Participants will receive placebo for 24 weeks
Ander: Placebo PH20 SC

subcutaneous administrations of placebo PH20 SC given by prefilled syringe (PFS). For participants aged 12 to <18 years with body weight

≤50 kg, the study drug will be administered by vial and syringe
Experimenteel: Part C (Open-Label Extension Period): Efgartigimod PH20 SC
Participants who complete Part B will receive efgartigimod PH20 SC for 24 weeks
Biologisch: Efgartigimod PH20 (ARGX-113) SC
subcutaneous administrations of efgartigimod PH20 SC given by prefilled syringe (PFS). For participants aged 12 to <18 years with body weight ≤50 kg, the study drug will be administered by vial and syringe.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in CASE score in the NMDAR population
Tijdsspanne: up to week 24
CASE= Clinical Assessment Scale in Autoimmune Encephalitis; NMDAR=N-methyl-D-aspartate receptor; Neuropsychological Status. The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure, memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
up to week 24

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in mRS
Tijdsspanne: up to week 8
The mRS (modified Rankin Scale) is commonly used to measure the degree of disability or dependence in the daily activities of people with neurological disabilities. Scores range from 0 (no symptoms) to 6(dead).
up to week 8
Change in CASE score
Tijdsspanne: up to week 8
The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure, memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
up to week 8
Change in MoCA total score
Tijdsspanne: up to week 8
MoCA= Montreal Cognitive Assessment
up to week 8
Change in NPI-C total score
Tijdsspanne: up to week 8
The NPI-C (Neuropsychiatric Inventory--Clinician) total score will be used as a global measure of neuropsychiatric symptoms.Total score is calculated by summing the scores of all the individual domains.Each domain score is determined by summing the item scores within that domain. The NPI-C uses a clinician rating method, where ratings for frequency, severity, and caregiver distress are provided for each item.These item scores are then summed to create a total domain score.
up to week 8
Change from baseline in CGI-S
Tijdsspanne: up to week 8

Expression of Change. CGI is a clinician-rated scale that measures illness severity (CGI-S) and global improvement or change (CGI-C).It is rated on a 7-point scale, from 1 (normal) to 7 (amongst the most severely ill patients) for CGI-S and from 1 (very much improved) to 7 (very much worse) for CGI-C.

PGI-S and PGI-C are the patient-reported counterparts to CGI-S and CGI-C, respectively.
up to week 8
Change from baseline in PGI-S
Tijdsspanne: up to week 8
A Impression of Severity; PGI-S= Patient Global Impression Scale. PGI-S and PGI-C are the patient-reported counterparts to CGI-S and CGI-C, respectively.
up to week 8
Change from baseline in CGI-C
Tijdsspanne: up to week 8

CGI-C= Clinical Global Expression of Change . CGI is a clinician-rated scale that measures illness severity (CGI-S) and global improvement or change (CGI-C).It is rated on a 7-point scale, from 1 (normal) to 7 (amongst the most severely ill patients) for CGI-S and from 1 (very much improved) to 7 (very much worse) for CGI-C.

PGI-S and PGI-C are the patient-reported counterparts to CGI-S and CGI-C, respectively.
up to week 8
Change from baseline in PGI-C
Tijdsspanne: up to week 8
A Impression of Severity; PGI-C= Patient Global Expression of Change . PGI-S and PGI-C are the patient-reported counterparts to CGI-S and CGI-C, respectively.
up to week 8
Incidence and severity of AEs
Tijdsspanne: up to week 8
AEs= Adverse Effects
up to week 8
Incidence and severity of SAEs
Tijdsspanne: up to week 8
SAEs = Serious Adverse Effects
up to week 8
Trough efgartigimod serum concentrations over time
Tijdsspanne: up to week 8
up to week 8
Percent change from baseline in total IgG levels in serum over time
Tijdsspanne: up to week 8
IgG= Immunoglobulin G
up to week 8
Incidence and prevalence of ADA against efgartigimod in serum over time
Tijdsspanne: up to week 8
ADA = antidrug antibody(ies)
up to week 8
Incidence and prevalence of antibodies against rHuPH20 in plasma over time
Tijdsspanne: up to week 8
rHuPH20 = Recombinant Human Hyaluronidase PH20
up to week 8
Change in mRS in the NMDAR population
Tijdsspanne: up to week 24
The mRS (modified Rankin Scale) is commonly used to measure the degree of disability or dependence in the daily activities of people with neurological disabilities. Scores range from 0 (no symptoms) to 6(dead)
up to week 24
Change in NPI-C total score in the NMDAR population
Tijdsspanne: up to week 24
NPI-C=Neuropsychiatric Inventory-Clinician; NMDAR=N-methyl-D-aspartate receptor. The NPI-C (Neuropsychiatric Inventory--Clinician) total score will be used as a global measure of neuropsychiatric symptoms. Total score is calculated by summing the scores of all the individual domains. Each domain score is determined by summing the item scores within that domain. The NPI-C uses a clinician rating method, where ratings for frequency, severity, and caregiver distress are provided for each item.These item scores are then summed to create a total domain score.
up to week 24
Change in RBANS in the NMDAR population
Tijdsspanne: up to week 24
RBANS=Repeatable Battery for the Assessment of Neuropsychological Status; NMDAR=N-methyl-D-aspartate receptor. The RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) is a performance outcome measure developed to identify and characterize cognitive impairment by assessing an individual's current level of cognitive performance.
up to week 24
Percentage of CASE responders in the NMDAR population.
Tijdsspanne: at week 24
CASE = Clinical Assessment Scale in AIE ; NMDAR=N-methyl-D-aspartate receptor
at week 24
Change in CASE score in the non-NMDAR population
Tijdsspanne: up to week 24
CASE = Clinical Assessment Scale in AIE; NMDAR=N-methyl. The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure,memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
up to week 24
Change in RBANS in the non-NMDAR population
Tijdsspanne: up to week 24
RBANS= Repeatable Battery for the Assessment of Neuropsychological Status; NMDAR=N-methyl-D-aspartate receptor. The RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) is a performance outcome measure developed to identify and characterize cognitive impairment by assessing an individual's current level of cognitive performance.
up to week 24
Change in NPI-C total score in the non-NMDAR population
Tijdsspanne: up to week 24
NPI-C= Neuropsychiatric Inventory-Clinician; NMDAR=N-methyl-D-aspartate receptor. The NPI-C Neuropsychiatric Inventory--Clinician) total score will be used as a global measure of neuropsychiatric symptoms. Total score is calculated by summing the scores of all the individual domains. Each domain score is determined by summing the item scores within that domain. The NPI-C uses a clinician rating method, where ratings for frequency, severity, and caregiver distress are provided for each item.
up to week 24
Change in mRS in the non-NMDAR population
Tijdsspanne: up to week 24
mRS= modified Rankin Scale; NMDAR=N-methyl-D-aspartate receptor. The mRS (modified Rankin Scale) is commonly used to measure the degree of disability or dependence in the daily activities of people with neurological disabilities.Scores range from 0 (no symptoms) to 6 (dead).
up to week 24
Percentage of CASE responders in the non-NMDAR population.
Tijdsspanne: at week 24
CASE = Clinical Assessment Scale in AIE ; NMDAR=N-methyl-D-aspartate receptor. The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure, memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
at week 24
Incidence and severity of AEs
Tijdsspanne: week 24 onwards
AEs = Adverse Effects
week 24 onwards
Incidence and severity of SAEs
Tijdsspanne: week 24 onwards
SAEs = Serious Adverse Effects
week 24 onwards
Proportion of participants with presence of neuropsychiatric symptoms, defined by NPI-C total score of at least 1 point
Tijdsspanne: at week 24
NPI-C= Neuropsychiatric Inventory-Clinician. The NPI-C (Neuropsychiatric Inventory--Clinician) total score will be used as a global measure of neuropsychiatric symptoms. Total score is calculated by summing the scores of all the individual domains. Each domain score is determined by summing the item scores within that domain. The NPI-C uses a clinician rating method, where ratings for frequency, severity, and caregiver distress are provided for each item.
at week 24
Change in MoCA total score
Tijdsspanne: up to week 24
MoCA= Montreal Cognitive Assessment
up to week 24
Proportion of participants with a favorable outcome in mRS where favorable outcome is defined as no worsening for participants with a baseline mRS score of ≤2 or improvement of ≥1 point for participants with a baseline mRS score of >2
Tijdsspanne: up to week 24
mRS=modified Rankin Scale. The mRS (modified Rankin Scale) is commonly used to measure the degree of disability or dependence in the daily activities of people with neurological disabilities. Scores range from 0 (no symptoms) to 6 (dead).
up to week 24
Change in CGI-S
Tijdsspanne: up to week 24
CGI-S= Clinical Global Impression of Severity. CGI is a clinician-rated scale that measures illness severity (CGI-S) and global improvement or change (CGI-C).It is rated on a 7-point scale, from 1 (normal) to 7 (amongst the most severely ill patients) for CGI-S and from 1 (very much improved) to 7 (very much worse) for CGI-C.
up to week 24
Change in CGI-C
Tijdsspanne: up to week 24
CGI-C= Clinical Global Impression of Change. CGI is a clinician-rated scale that measures illness severity (CGI-S) and global improvement or change (CGI-C).It is rated on a 7-point scale, from 1 (normal) to 7 (amongst the most severely ill patients) for CGI-S and from 1 (very much improved) to 7 (very much worse) for CGI-C.
up to week 24
Change in PGI-C
Tijdsspanne: week 0 to week 24
PGI-C =Patient Global Expression of Change. PGI-S and PGI-C are the patient-reported counterparts to CGI-S and CGI-C, respectively.
week 0 to week 24
Change in PGI-S
Tijdsspanne: week 0 to week 24
PGI-S= Patient Global Expression of Severity. PGI-S and PGI-C are the patient-reported counterparts to CGI-S and CGI-C, respectively.
week 0 to week 24
Time to resolution of status epilepticus
Tijdsspanne: up to 24 weeks
up to 24 weeks
Time to first occurrence of seizure freedom.
Tijdsspanne: up to 24 weeks
Seizure freedom is defined as no seizures for at least 28 consecutive days
up to 24 weeks
Proportion of participants with seizure freedom for at least the 28 consecutive days
Tijdsspanne: up to 24 weeks
up to 24 weeks
Time to use of rescue therapy after randomization
Tijdsspanne: up to 24 weeks
up to 24 weeks
Trough efgartigimod serum concentrations over time
Tijdsspanne: up to 24 weeks
up to 24 weeks
Percent change in total IgG levels in serum
Tijdsspanne: up to 24 weeks
IgG = Immunoglobulin G
up to 24 weeks
Incidence and prevalence of ADA against efgartigimod in serum over time
Tijdsspanne: up to 24 weeks
ADA = anti drug antibodies
up to 24 weeks
Incidence and prevalence of antibodies against rHuPH20 in plasma over time
Tijdsspanne: up to 24 weeks
rHuPH20 = Recombinant Human Hyaluronidase PH20
up to 24 weeks
Change in CASE score in the NMDAR population compared with the non-NMDAR population
Tijdsspanne: up to 24 weeks
CASE = Clinical Assessment Scale in AIE ; NMDAR=N-methyl-D-aspartate receptor. . The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure, memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
up to 24 weeks
Change in RBANS total score
Tijdsspanne: week 24 to week 48
The RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) is a performance outcome measure developed to identify and characterize cognitive impairment by assessing an individual's current level of cognitive performance.
week 24 to week 48
Percentage of participants with maintained change in the CASE total score (defined as stable or improving)
Tijdsspanne: week 24 to week 48
The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure, memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
week 24 to week 48
Percentage of participants with maintained mRS score (defined as stable or improving)
Tijdsspanne: week 24 to week 48
The mRS (modified Rankin Scale) is commonly used to measure the degree of disability or dependence in the daily activities of people with neurological disabilities. Scores range from 0 (no symptoms) to 6 (dead).
week 24 to week 48
Change in NPI-C total score
Tijdsspanne: week 24 to week 48
The NPI-C (Neuropsychiatric Inventory--Clinician) total score will be used as a global measure of neuropsychiatric symptoms.Total score is calculated by summing the scores of all the individual domains. Each domain score is determined by summing the item scores within that domain. The NPI-C uses a clinician rating method, where ratings for frequency, severity, and caregiver distress are provided for each item. These item scores are then summed to create a total domain score.
week 24 to week 48
Proportion of participants requiring rescue or second-line AIE therapies
Tijdsspanne: week 24 to week 48
AIE = Auto-Immune Encephalitis
week 24 to week 48
Time to participants requiring rescue or second-line AIE therapies
Tijdsspanne: week 24 to week 48
AIE = Auto-Immune Encephalitis
week 24 to week 48
Change in CASE
Tijdsspanne: week 24 to week 48
The CASE (Clinical Assessment Scale in AIE) includes an assessment of 9 items: seizure, memory dysfunction, psychiatric symptoms, consciousness, language problems, dyskinesia/dystonia, gait instability and ataxia, brainstem dysfunction, weakness. This overall CASE total score ranges from 0 to 27, with a higher score indicating a greater degree of disability.
week 24 to week 48
Change in mRs
Tijdsspanne: week 24 to week 48
The mRS (modified Rankin Scale) is commonly used to measure the degree of disability or dependence in the daily activities of people with neurological disabilities. Scores range from 0 (no symptoms) to 6 (dead).
week 24 to week 48
Change in RBANS
Tijdsspanne: week 24 to week 48
The RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) is a performance outcome measure developed to identify and characterize cognitive impairment by assessing an individual's current level of cognitive performance.
week 24 to week 48
Time to resolution of status epilepticus
Tijdsspanne: week 24 to week 48
week 24 to week 48
Proportion of participants with seizure freedom for at least the 28 consecutive days preceding the participants in final Part of trial
Tijdsspanne: week 24 to week 48
mRS=modified Rankin Scale
week 24 to week 48
Incidence and prevalence of ADA against efgartigimod in serum
Tijdsspanne: week 24 to week 48
ADA = antidrug antibody(ies)
week 24 to week 48
Percent change in total IgG levels in serum
Tijdsspanne: week 24 to week 48
IgG = Immunoglobulin G
week 24 to week 48

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

argenx

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

13 juli 2026

Primaire voltooiing (Geschat)

4 december 2030

Studie voltooiing (Geschat)

26 juli 2031

Studieregistratiedata

Eerst ingediend

7 mei 2026

Eerst ingediend dat voldeed aan de QC-criteria

7 mei 2026

Eerst geplaatst (Werkelijk)

13 mei 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

13 mei 2026

Laatste update ingediend die voldeed aan QC-criteria

7 mei 2026

Laatst geverifieerd

1 mei 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • ARGX-113-22-AIE-2001

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Ja

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

Klinische onderzoeken op Auto-immuunencefalitis (AE)

Klinische onderzoeken op Efgartigimod PH20 (ARGX-113) SC

Zoek naar vergelijkbare onderzoeken

Sponsors en medewerkers

Medische omstandigheden

Geneesmiddelinterventies

CROs by country

CROs in Ireland

Voorwaarden

Zeldzame ziekten

Geneesmiddelinterventies

Voedingssupplementen

Sponsor / medewerkers

Locaties

Abonneren