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DIAG723 in Adults With Hereditary Hemorrhagic Telangiectasia

NCT07623525 · Status: RECRUITING · Phase: PHASE1/PHASE2 · Type: INTERVENTIONAL · Enrollment: 93

Last updated 2026-08-03

No results posted yet for this study

Summary

This is a Phase 1/2, randomized, double-blind, placebo-controlled, first-in-human study evaluating the safety, tolerability, pharmacokinetics, and preliminary efficacy of subcutaneously administered DIAG723 in adult patients with hereditary hemorrhagic telangiectasia (HHT).

The study consists of three parts:

Part A (dose escalation): Single ascending subcutaneous doses of DIAG723 are evaluated in sequential cohorts to assess safety, tolerability, and pharmacokinetics.

Part B (dose expansion): Multiple doses of DIAG723 administered over 13 weeks are evaluated in patients with HHT to assess safety and preliminary efficacy.

Part C (dose expansion): Multiple doses of DIAG723 administered over 13 weeks are evaluated in patients with HHT and concomitant pulmonary arterial hypertension to assess safety and exploratory clinical effects in this population.

Participants will be randomized within each study part to receive DIAG723 or placebo. The study includes dose escalation in Part A and dose expansion in Parts B and C.

Conditions

Interventions

BIOLOGICAL

DIAG723

Bispecific agonist monoclonal antibody targeting ALK-1 and BMPRII, administered subcutaneously as: Single ascending dose in Part A; Multiple doses (7 doses over 13 weeks) in Parts B and C

OTHER

Placebo

Sterile normal saline (0.9% NaCl) administered subcutaneously in volumes matched to DIAG723 to maintain study blinding.

Sponsors & Collaborators

  • Diagonal Therapeutics, Inc.

    lead INDUSTRY

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2026-06-04
Primary Completion
2027-11-30
Completion
2027-12-31

Countries

  • Australia
  • Canada
  • New Zealand

Study Locations

More Related Trials

Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07623525 on ClinicalTrials.gov