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A Study to Assess Efficacy and Safety of Efgartigimod PH20 SC PFS in Adult Participants With Graves' Disease. (VitaliThy)

16 de septiembre de 2026 actualizado por: argenx

A Phase 3, Randomized, Double-Masked, Placebo-Controlled, Multicenter Study Evaluating the Efficacy and Safety of Efgartigimod PH20 SC PFS in Adult Participants With Graves' Disease Inadequately Controlled With Antithyroid Drugs

The main purpose of this study is to look at how efgartigimod affects thyroid function in adults with Graves' Disease (GD). The study will also check whether efgartigimod is safe and well tolerated. It will look at how efgartigimod is distributed and eliminated in the body, how it changes antibody levels, and how the immune system responds to it.

The study consists of a part A double-blinded treatment period, a part B treatment/observation period and a part C open-label treatment/observation period. During the part A and part B treatment periods, participants will receive efgartigimod PH20 SC via Prefilled Syringe (PFS) or placebo. During the part C open-label treatment period, participants will receive efgartigimod PH20 SC PFS. Participation in the different parts of the study will depend on the participant's response to treatment.

The total study duration for participants ranges from 63 to 135 weeks, depending on the response to treatment.

More information can be found here: https://clinicaltrials.argenx.com/vitalithy

Descripción general del estudio

Estado

Reclutamiento

Tipo de estudio

Intervencionista

Inscripción (Estimado)

230

Fase

  • Fase 3

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Estudio Contacto

Ubicaciones de estudio

      • Sliven, Bulgaria, 8800
        • Activo, no reclutando
        • Multiprofile Hospital for Active Treatment Hadzhi Dimitar OOD
      • Surrey, Canadá, V3T 2V6
        • Reclutamiento
        • TLC Diabetes and Endocrinology Clinic
        • Contacto:
          • Akshay Jain, MD
          • Número de teléfono: +14032883224
          • Correo electrónico: oxyjain@gmail.com
    • Quebec
      • Montreal, Quebec, Canadá, H4J1E3
        • Activo, no reclutando
        • Endocrinologie Oasis
      • Batumi, Georgia, 6000
        • Reclutamiento
        • High Technology Hospital Medcenter LLC
        • Contacto:
      • Tbilisi, Georgia, 0160
        • Reclutamiento
        • LTD MediClub Georgia
        • Contacto:
          • Nino Dolidze, MD
          • Número de teléfono: +995600000000
          • Correo electrónico: n.dolidze@mcg.ge
      • Tbilisi, Georgia, 0102
      • Iizuka, Japón, 820-8505
        • Reclutamiento
        • Aso Iizuka Hospital
        • Contacto:
      • Kawasaki, Japón, 211-8533
        • Reclutamiento
        • Nippon Medical School Musashikosugi Hospital
        • Contacto:
      • Kitakyushu, Japón, 807-8556
        • Reclutamiento
        • Hospital of University of Occupational and Environmental Health
        • Contacto:
      • Kyoto, Japón, 612-0861
        • Reclutamiento
        • National Hospital Organization Kyoto Medical Center
        • Contacto:
      • Nagasaki, Japón, 852-8501
        • Reclutamiento
        • Nagasaki University Hospital
        • Contacto:
      • Shibuya City, Japón, 150-8308
        • Reclutamiento
        • Ito Hospital
        • Contacto:
      • Yokohama, Japón, 224-8503
        • Reclutamiento
        • SHOWA Medical University Northern Yokohama Hospital
        • Contacto:
      • Yonago, Japón, 683-8504
    • Kauno
      • Kaunas, Kauno, Lituania, 50161
        • Activo, no reclutando
        • Hospital of Lithuanian University of Health Sciences Kaunas
      • Bydgoszcz, Polonia, 85-605
        • Activo, no reclutando
        • Centrum Medyczne Intercor Sp. z o.o.
      • Zamość, Polonia, 22400
        • Activo, no reclutando
        • ETC Zamosc

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

  • Adulto
  • Adulto Mayor

Acepta Voluntarios Saludables

No

Descripción

Inclusion Criteria:

  • Is at least 18 years of age and the local legal age of consent for clinical studies when signing the ICF.
  • Has a documented diagnosis of GD with TRAb (anti-thyrotropin receptor antibody) levels >=ULN (upper limit of normal) at screening
  • Has active hyperthyroidism due to GD with TSH (thyroid-stimulating hormone) <0.1 mIU/L at screening
  • Has been treated with MMI (methimazole) or CBZ (carbimazole) for at least 3 months before screening

Exclusion Criteria:

  • History of hyperthyroidism not caused by GD (eg, toxic adenoma or toxic multinodular goiter)
  • History of RAI (radioactive iodine) therapy or received a total thyroidectomy
  • T3- or T4-containing medication or supplement (eg, levothyroxine, liothyronine, desiccated thyroid preparations, or thyroid-support supplements) received <6 weeks before screening
  • Any complication of hyperthyroidism or underlying medical condition that would put the participant at undue risk. This includes arrhythmia or tachyarrhythmia related to GD, such as atrial fibrillation or atrial flutter not sufficiently controlled with medications.
  • Graves' orbitopathy/Thyroid Eye Disease (GO/TED) requiring systemic therapy (eg, corticosteroids), orbital injections, orbital surgery, or orbital radiation, or expected immediate surgical intervention and/or planned corrective surgery/irradiation or medical therapy during the study

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

  • Propósito principal: Tratamiento
  • Asignación: Aleatorizado
  • Modelo Intervencionista: Asignación paralela
  • Enmascaramiento: Cuadruplicar

Armas e Intervenciones

Grupo de participantes/brazo
Intervención / Tratamiento
Experimental: Part A - efgartigimod PH20 SC PFS
Participants will receive efgartigimod PH20 SC Via Prefilled Syringe (PFS) during the part A double-blinded treatment period.
Subcutaneous injection of Efgartigimod PH20 Via Prefilled Syringe (PFS)
Comparador de placebos: Part A - placebo PH20 SC PFS
Participants will receive placebo PH20 SC Via Prefilled Syringe (PFS) during the part A double-blinded treatment period.
Subcutaneous injection of placebo PH20 via Prefilled Syringe (PFS)
Experimental: Part B - efgartigimod PH20 SC PFS
Participants will receive efgartigimod PH20 SC Via Prefilled Syringe (PFS) during the part B treatment period.
Subcutaneous injection of Efgartigimod PH20 Via Prefilled Syringe (PFS)
Experimental: Part B - placebo PH20 SC PFS
Participants will receive placebo PH20 SC Via Prefilled Syringe (PFS) during the part B treatment period.
Subcutaneous injection of placebo PH20 via Prefilled Syringe (PFS)
Experimental: Part C - efgartigimod PH20 SC PFS
Participants, will receive efgartigimod PH20 SC PFS in the part C open-label treatment period
Subcutaneous injection of Efgartigimod PH20 Via Prefilled Syringe (PFS)

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Percentage of participants who are euthyroid (fT3, fT4, and TSH within normal ranges) off ATDs at week 24 in part A
Periodo de tiempo: up to 24 weeks (part A)
free triiodothyronine: [fT3]; free thyroxine: [fT4]; ATDs: antithyroid drugs
up to 24 weeks (part A)

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Time to becoming euthyroid off ATDs in part A
Periodo de tiempo: Up to 24 weeks (part A)
ATDs: antithyroid drugs
Up to 24 weeks (part A)
Percentage of participants who are euthyroid and receiving MMI ≤5 mg/day or CBZ ≤7.5 mg/day at week 24 in part A
Periodo de tiempo: up to 24 weeks (part A)
MMI: methimazole (also known as thiamazole); CBZ carbimazole
up to 24 weeks (part A)
Percentage of participants with fT3 and fT4 levels below the ULN off ATDs at week 24 in part A
Periodo de tiempo: Up to 24 weeks (part A)
ULN : upper limit of normal; ATDs: antithyroid drugs
Up to 24 weeks (part A)
Percentage of participants who are euthyroid off ATDs and TRAb seronegative at week 24 in part A
Periodo de tiempo: up to 24 weeks (part A)
TRAb: anti-TSHR autoantibodies; ATDs: antithyroid drugs
up to 24 weeks (part A)
Time to becoming euthyroid off ATDs and TRAb seronegative
Periodo de tiempo: up to 24 weeks (part A) + up to 135 weeks
ATDs: antithyroid drugs; TRAb: anti-TSHR autoantibodies
up to 24 weeks (part A) + up to 135 weeks
Time to becoming euthyroid and receiving an ATD dose of MMI ≤5 mg/day or CBZ ≤7.5 mg/day (part A)
Periodo de tiempo: up to 24 weeks
ATDs: antithyroid drugs; MMI: methimazole (also known as thiamazole); CBZ carbimazole
up to 24 weeks
Time to becoming euthyroid
Periodo de tiempo: up to 24 weeks (part A) + up to 135 weeks
up to 24 weeks (part A) + up to 135 weeks
Time to having fT3 and fT4 levels within normal ranges among participants who had fT3 and/or fT4 more than the ULN at baseline (part A)
Periodo de tiempo: up to 24 weeks (part A)
ULN : upper limit of normal
up to 24 weeks (part A)
Time to having TSH within normal ranges among participants who have TSH lower than the LLN at baseline (part A)
Periodo de tiempo: up to 24 weeks (part A)
TSH: thyroid-stimulating hormone; LLN: lower limit of normal
up to 24 weeks (part A)
Percentage of participants who remain euthyroid without ATDs and without efgartigimod PH20 SC PFS for 6, 12, and 18 months
Periodo de tiempo: up to 74 weeks (part B) + up to 135 weeks
ATDs: antithyroid drug
up to 74 weeks (part B) + up to 135 weeks
Percentage of participants who remain euthyroid without ATDs and without efgartigimod PH20 SC PFS
Periodo de tiempo: up to 72 weeks (part C)
ATDs: antithyroid drug
up to 72 weeks (part C)
Incidence of AEs and SAEs
Periodo de tiempo: up to 135 weeks
AEs: adverse events ; SAEs: serious adverse events
up to 135 weeks
Change in ThyPRO-39 over time
Periodo de tiempo: Up to 135 weeks
The Thyroid-Specific Patient-Reported Outcome Short Form (ThyPRO-39) 39 item version of the ThyPRO. Each item is related to a specific aspect of the participant's experience with their thyroid condition. Each item is scored on a 5-point Likert scale, and the scores are then transformed to a 0-to-100 scale. Higher scores indicate worse health status
Up to 135 weeks
Change in PROMIS-PF10a over time
Periodo de tiempo: up to 135 weeks
The Patient-Reported Outcomes Measurement Information System Physical Function-10 item (PROMIS-PF10a) is a self- administered physical functioning assessment comprising 10 items that measure respondents' ability to perform common physical tasks. Scoring involves summing the numerical responses to each item; higher scores indicate better physical function.
up to 135 weeks
Efgartigimod serum concentrations over time
Periodo de tiempo: up to 24 weeks (part A) + 72 weeks (part C)
up to 24 weeks (part A) + 72 weeks (part C)
Percentage change from baseline in total IgG levels in serum over time
Periodo de tiempo: up to 98 weeks
IgG: immunoglobulin G
up to 98 weeks
Percentage change from baseline in TRAb serum levels over time
Periodo de tiempo: up to 135 weeks
TRAb: anti-TSHR autoantibodies
up to 135 weeks
Incidence of ADA against efgartigimod in serum
Periodo de tiempo: up to 24 weeks (part A) + up to 135 weeks
ADA: antidrug antibody(ies)
up to 24 weeks (part A) + up to 135 weeks
Incidence of antibodies against rHuPH20 in plasma
Periodo de tiempo: up to 24 weeks (part A) + Up to 135 weeks
rHuPH20: recombinant human hyaluronidase PH20
up to 24 weeks (part A) + Up to 135 weeks
Incidence of NAb against efgartigimod in serum and rHuPH20 in plasma
Periodo de tiempo: up to 24 weeks (part A) + up to 135 weeks
NAb: neutralizing antibody(ies); rHuPH20: recombinant human hyaluronidase PH20
up to 24 weeks (part A) + up to 135 weeks
Percentage of participants who remain euthyroid off ATDs
Periodo de tiempo: Up to 50 weeks (part B)
ATDs: antithyroid drug
Up to 50 weeks (part B)
Percentage of participants who are euthyroid and receiving MMI ≤5 mg/day or CBZ ≤7.5 mg/day
Periodo de tiempo: Up to 50 weeks (part B)
ATDs: antithyroid drug
Up to 50 weeks (part B)
Percentage of participants who remain euthyroid without ATDs
Periodo de tiempo: up to 98 weeks (part B)
ATDs: antithyroid drug
up to 98 weeks (part B)

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Publicaciones y enlaces útiles

La persona responsable de ingresar información sobre el estudio proporciona voluntariamente estas publicaciones. Estos pueden ser sobre cualquier cosa relacionada con el estudio.

Enlaces Útiles

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Actual)

10 de junio de 2026

Finalización primaria (Estimado)

1 de junio de 2028

Finalización del estudio (Estimado)

1 de mayo de 2030

Fechas de registro del estudio

Enviado por primera vez

13 de mayo de 2026

Primero enviado que cumplió con los criterios de control de calidad

13 de mayo de 2026

Publicado por primera vez (Actual)

19 de mayo de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

17 de septiembre de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

16 de septiembre de 2026

Última verificación

1 de agosto de 2026

Más información

Términos relacionados con este estudio

Otros números de identificación del estudio

  • ARGX-113-25-GRD-3001
  • 2025 (Subvención/contrato del NIH de EE. UU.: Faculty of Social Sciences Scientific Grant at the University of Gdańsk)
  • 2025-523333-26-00 (Ctis)

Plan de datos de participantes individuales (IPD)

¿Planea compartir datos de participantes individuales (IPD)?

NO

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

Sí

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

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