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A Phase 3, Randomized, Double-blinded, Placebo-controlled, Multicenter Study to Evaluate Efficacy and Safety of ALXN1850 Versus Placebo Administered Subcutaneously in Pediatric (2 to < 12 years of age) Participants with Hypophosphatasia Who Have Not Received Previous Treatment with Asfotase Alfa

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2023-505675-73-00
Acronym
ALXN1850-HPP-305
Enrollment
13
Registered
2024-02-26
Start date
2024-04-26
Completion date
Unknown
Last updated
2025-07-09

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

Conditions

hypophosphatasia

Brief summary

RGI-C score at the end of the Randomized Evaluation Period (Day 169)

Detailed description

Change from baseline in RSS at the end of the Randomized Evaluation Period (Day 169), "Change from baseline at the end of the Randomized Evaluation Period (Day 169) in the following: - 6MWT (≥ 5 years of age) - % Predicted 6MWT (≥ 5 years of age) - BOT-2 (≥ 4 years of age) - PDMS-3 (< 4 years of age)", RGI-C responder at the end of the Randomized Evaluation Period (Day 169), Change from baseline at the end of the Randomized Evaluation Period (Day 169) in the following: - EQ-5D-Y health state score (≥ 8 years of age) - EQ-5D-Y-Proxy Version 1 health state score (≥ 4 to < 8 years of age) - PODCI-Parent global function score - APPT score (≥ 8 years of age) - Pediatric FACIT-Fatigue score (≥ 8 years of age) -Pediatric FACIT-Fatigue Proxy score (≥ 2 to < 8 years of age), TSQM-9 score at the end of the Randomized Evaluation Period (Day 169), Incidence of TEAEs, TESAEs, AESIs, and AEs leading to study intervention discontinuation or interruption, "Estimation of PK parameters and accumulation ratios - ALXN1850 PK: AUC(0-24h) at Day 1, AUC(0-24h) and C(trough) at D85; accumulation ratio of D85 to Day 1 based on AUC(0-24h)", Plasma ALXN1850 C(trough) over time through the end of the Randomized Evaluation Period (Day 169), "Estimation of PD parameters - Observed, change, and percent changes in plasma concentration of PPi, PLP, PA, and PLP/PL ratio from baseline through the end of the Randomized Evaluation Period (Day 169)", ADA incidence, ADA response categories, and ADA titer, as well as NAb incidence and NAb titers

Interventions

Sponsors

Alexion Pharmaceuticals Inc.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
0 Years to 17 Years

Design outcomes

Primary

MeasureTime frame
RGI-C score at the end of the Randomized Evaluation Period (Day 169)

Secondary

MeasureTime frame
Change from baseline in RSS at the end of the Randomized Evaluation Period (Day 169), "Change from baseline at the end of the Randomized Evaluation Period (Day 169) in the following: - 6MWT (≥ 5 years of age) - % Predicted 6MWT (≥ 5 years of age) - BOT-2 (≥ 4 years of age) - PDMS-3 (< 4 years of age)", RGI-C responder at the end of the Randomized Evaluation Period (Day 169), Change from baseline at the end of the Randomized Evaluation Period (Day 169) in the following: - EQ-5D-Y health state score (≥ 8 years of age) - EQ-5D-Y-Proxy Version 1 health state score (≥ 4 to < 8 years of age) - PODCI-Parent global function score - APPT score (≥ 8 years of age) - Pediatric FACIT-Fatigue score (≥ 8 years of age) -Pediatric FACIT-Fatigue Proxy score (≥ 2 to < 8 years of age), TSQM-9 score at the end of the Randomized Evaluation Period (Day 169), Incidence of TEAEs, TESAEs, AESIs, and AEs leading to study intervention discontinuation or interruption, "Estimation of PK parameters and accumula

Countries

Belgium, Finland, France, Italy, Poland, Romania, Spain, Sweden

Outcome results

None listed

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