Evaluation of Safety, Tolerability, and Efficacy of INZ-701 in Adults With ABCC6 Deficiency Causing PXE

Phase 1

Active, not recruiting

• Conditions: Pseudoxanthoma Elasticum; ATP-Binding Cassette Subfamily C Member 6 Deficiency; Generalized Arterial Calcification of Infancy
• Interventions: Drug: INZ-701

• Registration Number: NCT05030831
• Lead Sponsor: Inozyme Pharma

Brief Summary

The purpose of this study is to assess the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics PD) of multiple ascending doses of INZ-701, an ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1) recombinant fusion protein, for the treatment of ABCC6 Deficiency. The goal of the study is to identify a dose regimen for further clinical development in the treatment of ABCC6 Deficiency.

Detailed Description

INZ-701 is an ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1) recombinant fusion protein in development for the treatment of ABCC6 Deficiency, a rare genetic disorder.

Study INZ701-201 is a Phase 1/2, multicenter, open-label, multiple ascending dose (MAD), dose-finding study followed by a long-term open-label Extension Period conducted in adults with ABCC6 Deficiency manifesting as Pseudoxanthoma elasticum (PXE). This study is designed to assess the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of multiple ascending doses of INZ-701. The goal of the study is to identify a dose and dose schedule (number of doses per week) for further clinical development in ABCC6 Deficiency. No placebo will be used in this study.

Exploratory endpoints for the Extension Period of the study include evaluations of arterial and organ calcification, ophthalmologic, cardiac and renal parameters, and physical function as well as patient reported outcomes.

Subject participation consists of a Screening Period of up to 60 days, a 32-day Dose Evaluation Period, and an Extension Period during which subjects may continue to receive INZ-701 (with options for self-, caregiver-, or healthcare provider administration) until INZ-701 is approved and available in the country where the subject resides or until an alternative study for subjects to continue receiving study drug is available. During the Extension Period, follow-up visits will be conducted every 4 weeks until Week 48 of the Extension Period and then every 12 weeks (remote or in-clinic) until the subject leaves the study.

Subjects will complete a follow up visit 30 days after their last dose of INZ-701.

Study Timeline

• Study First Submitted: 2021-08-26
• Study First Submitted QC: 2021-08-26
• Study First Posted: 2021-09-01
• Study Start: 2022-04-11
• Status Verified: 2024-05
• Last Update Submitted: 2024-05-28
• Last Update Posted: 2024-05-30
• Primary Completion: 2024-11-15
• Study Completion: 2024-12-31

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 10

Inclusion Criteria

Not provided

Read More

Exclusion Criteria

Not provided

Read More

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
INZ-701	INZ-701	The study design of the Dose Evaluation Period is a MAD 3 + 3 with 3 dose cohorts. Based on nonclinical findings and nonclinical pharmacology modeling, the initial planned doses will be 0.2 mg/kg, 0.6 mg/kg, and 1.8 mg/kg, with a twice weekly dose regimen. During the Extension Period, INZ-701 administration will initially be at the dose and dose schedule assigned in the Dose Evaluation Period; however, the Sponsor may modify the assigned dose and/or dosing regimen in the Extension Period post-Week 48 based on cumulative review of safety and PK/PD data, including population PK. Study visits will be in-clinic every 4 weeks until Week 48 of the Extension Period and then every 12 weeks (remote or in-clinic) until the subject leaves the study. Subjects will complete an End of Study (EOS) Visit (Safety Follow-up Visit) 30 days after their last dose of INZ-701.

Primary Outcome Measures

Name	Time	Method
Number of Treatment Emergent Adverse Events (TEAEs)	52 weeks (Day 1 through Safety Follow-up Visit)	Treatment-emergent AEs are defined as any AE occurring from the first dose of INZ-701 through 30 days after the last dose of INZ-701.

Secondary Outcome Measures

Name	Time	Method
Change from Baseline in Plasma Inorganic Pyrophosphate (PPi) Levels	52 weeks (Baseline through Safety Follow-up Visit)	For each subject, plasma PPi will be measured via a series of blood samples obtained throughout the study, comparing the subject's baseline value over time.
Incidence of Anti-Drug Antibodies (ADAs)	52 weeks (Day 1 through Safety Follow-up Visit)	The presence of ADAs will be assessed and, if present, further evaluation will determine specificity and subtypes.
Maximum Plasma Concentration (Cmax) of INZ-701	32 days (Dose Evaluation Period)	For each subject, the maximum concentration of INZ-701 in the plasma will be measured via a series of blood samples obtained throughout the study, comparing the subject's baseline value over time.
Systemic Clearance of INZ-701	32 days (Dose Evaluation Period)	For each subject, clearance of INZ-701 from the body will be measured via a series of blood samples obtained throughout the study, comparing the subject's baseline value over time.
Area under the Plasma Concentration versus Time Curve (AUC) of INZ-701	32 days (Dose Evaluation Period)	For each subject, variation of concentration of INZ-701 in the plasma will be measured via a series of blood samples obtained throughout the study, comparing the subject's baseline value over time.

Trial Locations

Locations (2)

Clinilabs; 🇺🇸 Eatontown, New Jersey, United States

Richmond Pharmacology Ltd (RPL); 🇬🇧 London, United Kingdom