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Withdrawal of Prostacyclin Pathway Therapy in Patients With Pulmonary Arterial Hypertension Receiving Sotatercept (WATERLOO) (WATERLOO)

13 de julho de 2026 atualizado por: University of Alberta

Withdrawal of Background Prostacyclin Pathway Therapy in Patients With Pulmonary Arterial Hypertension Receiving Sotatercept: an Open Label Non-inferiority Trial

Pulmonary arterial hypertension (PAH) is a rare lung disease that leads to elevated blood pressure in the lungs and strain on the right side of the heart. For many years, treatments for PAH have included drugs that target the prostacyclin pathway using intravenous, subcutaneous, oral, and inhaled drugs. These drugs help widen the blood vessels in the lungs so the heart does not have to work as hard. However, these medicines can cause side effects such as jaw pain, flushing, diarrhea, and nausea, and the pump therapy can be very hard to manage day-to-day.

A newer medicine called sotatercept works in a different way. It helps fix some of the root causes of PAH. Early reports suggest that some people do very well on sotatercept and may not need to keep taking their prostacyclin therapy. However, investigators do not yet know if it is safe to stop prostacyclin therapies or how to do so. This study, called WATERLOO, is designed to find out whether slowly stopping prostacyclin therapy while the participant is doing well on sotatercept is safe. Investigators will compare people who stop their prostacyclin therapy to people who keep taking it. This study is being done at PAH expert centres in Canada and Europe.

Visão geral do estudo

Status

Ainda não está recrutando

Tipo de estudo

Intervencional

Inscrição (Estimado)

78

Estágio

  • Não aplicável

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

  • Nome: Canadian VIGOUR Centre Clinical Trial Project Lead
  • Número de telefone: 1-800-707-9098
  • E-mail: waterloo@ualberta.ca

Locais de estudo

    • Alberta
      • Edmonton, Alberta, Canadá
        • University of Alberta Hospital
        • Contato:

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

  • Adulto
  • Adulto mais velho

Aceita Voluntários Saudáveis

Não

Descrição

Inclusion Criteria: In order to be eligible for this study, a participant must meet all of the following criteria:

  1. Adults ≥ 18 years old diagnosed with PAH.
  2. Treatment with sotatercept for ≥6 months.
  3. Background therapy with ≥2 PAH vasodilator therapies, one of which is a parenteral prostacyclin or selexipag.
  4. At low or intermediate-low risk, defined using the 2022 ESC/ERS guidelines 4-strata risk assessment tool (Table 1).
  5. RHC at screening or historical within 8 weeks of screening, and after at least 6 months of sotatercept treatment, demonstrating a mPAP ≤40 mmHg and PVR ≤5 WU
  6. The ability to adhere to the study visit schedule and to comprehend and comply with all protocol requirements.
  7. Ability to provide informed consent.

Exclusion Criteria: A potential participant who meets any of the following criteria will be excluded from participation in this study:

  1. Known intolerance to sotatercept
  2. A RHC at screening or historical within 8 weeks of screening and after ≥6 months of sotatercept treatment demonstrating mPAP > 40 mmHg or PVR > 5 WU.
  3. Hospitalization for worsening PAH or right heart failure within the 3 months prior to screening.
  4. Active listing for lung or heart/lung transplantation.
  5. Metastatic cancer or any other condition with a life expectancy < 6 months,
  6. Female patients who are pregnant or who are of childbearing age and are unwilling to use contraception during the study.
  7. History of ≥ 3 interruptions or missed doses of sotatercept for any reason within the previous 6 months prior to screening.
  8. Patients who received any investigational medication within 1 month prior to screening (unless known to be placebo) or who are scheduled to receive another investigational drug during the course of this study.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Nenhum (rótulo aberto)

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Sem intervenção: Control group / no change to therapy
The control group will continue prostacyclin pathway therapies as per their authorized indications, with no change in dosage.
Experimental: Prostacyclin pathway therapy withdrawal
Dose de-escalation and discontinuation of parenteral prostacyclins analogues or selexipag
Discontinuation of parenteral prostacyclins analogues or selexipag

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Change in Mean Pulmonary Arterial Pressure (mPAP) From Baseline to 24 Weeks
Prazo: Baseline to 24 weeks
Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the change in mean pulmonary arterial pressure (mPAP), measured in mmHg, from baseline to Week 24 by right heart catheterization.
Baseline to 24 weeks

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Time to First Occurrence of All-Cause Death or Clinical Worsening
Prazo: Baseline to 24 weeks
Comparison between the prostacyclin pathway therapy withdrawal group and the continuation group in the time to first occurrence of the composite endpoint of all-cause death or clinical worsening. Clinical worsening is defined as any of the following: hospitalization for worsening PAH, decline in 6-minute walk distance (6MWD) ≥10% from baseline on two consecutive tests at least 4 hours apart accompanied by worsening WHO functional class, or worsening ESC/ERS 4-strata risk status.
Baseline to 24 weeks
Change in EmPHasis-10 Score From Baseline to Week 24
Prazo: Baseline to 24 weeks

Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the change from baseline to Week 24

Unit of Measure: Score Range: 0-50 Higher scores indicate worse pulmonary hypertension-related quality of life.

Baseline to 24 weeks
Change in EQ-5D-5L Index Score From Baseline to Week 24
Prazo: Baseline to Week 24

Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the change from baseline to Week 24 in the EQ-5D-5L Index Score.

Unit of Measure: Index score Country-specific value set; Higher scores indicate better health status.

Baseline to Week 24
Change in EQ Visual Analogue Scale (EQ VAS) Score From Baseline to Week 24
Prazo: Baseline to Week 24

Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the change from baseline to Week 24 in the EQ-5D-5L Index Score.

Unit of Measure: score Range: 0-100 Higher scores indicate better perceived health.

Baseline to Week 24
Change in Living with Medicines Questionnaire Version 3 (LMQ-3) Score From Baseline to Week 24
Prazo: Baseline to Week 24

Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the change from baseline to Week 24 in the EQ-5D-5L Index Score.

Unit of Measure: Score Range: 41-205 Higher scores indicate a greater medication burden.

Baseline to Week 24
Number of Participants Reporting Prostanoid-Associated Side Effects
Prazo: Baseline to 24 weeks
Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the number of participants reporting prostanoid-associated side effects, including jaw pain, flushing, nausea, diarrhea, and myalgia.
Baseline to 24 weeks

Outras medidas de resultado

Medida de resultado
Descrição da medida
Prazo
Number of Participants Experiencing Adverse Events (AEs)
Prazo: Baseline to 24, 52 and 104 (End of Study) weeks
Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the number of participants experiencing one or more adverse events.
Baseline to 24, 52 and 104 (End of Study) weeks
Number of Participants Experiencing Serious Adverse Events (SAEs)
Prazo: Baseline to 24, 52 and 104 (End of Study) weeks
Difference between the prostacyclin pathway therapy withdrawal group and the continuation group in the number of participants experiencing one or more serious adverse events.
Baseline to 24, 52 and 104 (End of Study) weeks
Participant Enrollment Rate
Prazo: Baseline to 24 weeks
Number of participants enrolled per site per month during the 24-week recruitment period.
Baseline to 24 weeks
Protocol Adherence Rate
Prazo: Baseline to Week 24
Proportion of participants who complete study procedures according to protocol through Week 24 without major protocol deviations.
Baseline to Week 24
Completeness of Secondary and Exploratory Outcome Data
Prazo: Baseline to Week 24
Proportion of expected secondary and exploratory outcome data points successfully collected through Week 24.
Baseline to Week 24

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Investigadores

  • Investigador principal: Dr. Jason Weatherald, MD, MSc, FRCPC, University of Alberta

Publicações e links úteis

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Publicações Gerais

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Estimado)

30 de setembro de 2026

Conclusão Primária (Estimado)

30 de março de 2028

Conclusão do estudo (Estimado)

30 de março de 2030

Datas de inscrição no estudo

Enviado pela primeira vez

15 de junho de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

8 de julho de 2026

Primeira postagem (Real)

14 de julho de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

15 de julho de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

13 de julho de 2026

Última verificação

1 de julho de 2026

Mais Informações

Termos relacionados a este estudo

Plano para dados de participantes individuais (IPD)

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INDECISO

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

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