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A Phase 1/2, Randomized, Double-blind, Placebo-controlled, 2 part Study of the Safety, Tolerability, Efficacy, Pharmacokinetics, and Pharmacodynamics of Single Dose ALN-6400 in Adult Healthy Volunteers and Multiple Dose ALN 6400 in Adult Patients with Hereditary Hemorrhagic Telangiectasia (HHT)

Status
Recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-522510-23-00
Acronym
ALN-6400-001
Enrollment
16
Registered
2025-11-26
Start date
2025-12-15
Completion date
Unknown
Last updated
2025-11-28

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hereditary Hemorrhagic Telangiectasia (HHT)

Brief summary

Frequency of AEs. Safety will also be evaluated through vital signs, ECGs, and clinical laboratory assessments.

Detailed description

Change from baseline in PLG o Plasma activity levels o Plasma protein levels, Change from baseline in epistaxis o Intensity-adjusted epistaxis duration o ESS o Epistaxis duration o Epistaxis frequency o Epistaxis intensity o Epistaxis-free days per month, • Change from baseline in hematologic parameters o HSS o Iron infusions o RBC transfusions o Hemoglobin, • Change from baseline in QoL/PRO scores o NOSE HHT o mPGI-S

Interventions

DRUGphosphate-buffered saline for SC administration

Sponsors

Alnylam Pharmaceuticals Inc.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Frequency of AEs. Safety will also be evaluated through vital signs, ECGs, and clinical laboratory assessments.

Secondary

MeasureTime frame
Change from baseline in PLG o Plasma activity levels o Plasma protein levels, Change from baseline in epistaxis o Intensity-adjusted epistaxis duration o ESS o Epistaxis duration o Epistaxis frequency o Epistaxis intensity o Epistaxis-free days per month, • Change from baseline in hematologic parameters o HSS o Iron infusions o RBC transfusions o Hemoglobin, • Change from baseline in QoL/PRO scores o NOSE HHT o mPGI-S

Countries

France, Germany, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026