Study of HST5040 in Subjects With Propionic or Methylmalonic Acidemia (HERO)

HemoShear Therapeutics

Status and phase: Terminated; Phase 2

Conditions: Methylmalonic Acidemia; Propionic Acidemia

Treatments: Drug: Placebo; Drug: HST5040

Study type: Interventional

Funder types: Industry

Identifiers

NCT04732429

HST20-CL01

Details and patient eligibility

About

This is an interventional study to assess the safety, PK, and efficacy of HST5040 in 12 subjects - 6 with Methylmalonic Acidemia (MMA) and 6 with Propionic Acidemia (PA). The study consists of 3 parts:

• Part A: Open-label, within-subject, dose escalation study in PA and MMA subjects ≥ 2 years old to identify a safe and pharmacologically active (optimal) dose of HST5040 for use in Part B. Subjects will continue in a Part A open-label extension until all subjects complete Part A and the optimal dose of HST5040 is identified for use in Part B.
• Part B: 6-month, randomized, double-blind, placebo-controlled, 2-period crossover in the same subjects from Part A to evaluate safety and efficacy of the optimal dose of HST5040 in addition to standard of care (SoC).
• Part C: open-label long-term extension study in PA and MMA subjects ≥ 2 years old (N = approximately 12, 6 each) to evaluate the long-term safety and efficacy of the optimal dose of HST5040.

This study will determine whether HST5040 can improve levels of disease-associated toxins that accumulate in patients with PA and MMA.

Enrollment: 26 patients

Sex: All

Ages: 2+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Confirmed diagnosis of symptomatic PA or MMA (Mutase)
• Ages ≥ 2 years old.
• History of Inadequate metabolic control while receiving standard of care (SoC).
• Plasma MCA concentration > 3x upper limit of normal of the reference range at screening.
• Stable supplementation dose of carnitine for at least 1 week prior to the entry in the study.

Exclusion criteria

• Moderate-to-severely impaired cardiac function with LVEF < 45% by ECHO.
• Clinically significant arrhythmia by Holter monitor.
• QTcF > 450 msec
• Moderate to severe chronic kidney disease with estimated glomerular filtration rate (eGFR) < 60 mL/min/1.73m2.
• Exposure to any investigational therapy, apart for a COVID-19 vaccine, within the past 6 months prior to study entry.
• Exposure to gene therapy for PA or MMA at any time prior to study entry.
• History of organ transplantation (Part A and B only)
• History of severe allergic or anaphylactic reactions to any of the components of HST5040.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Quadruple Blind

---

26 participants in 2 patient groups

Active Drug

Experimental group

Description:

Part B is the 6-month, randomized, double-blind (Subject/Investigator/Sponsor), placebo-controlled, 2-period crossover study consisting of 2 intervention periods of 12 weeks each to evaluate the safety and efficacy of the optimal dose of HST5040 in PA and MMA subjects ≥ 2 years old (N = minimum 12) in addition to SoC determined in Part A (within-subject dose escalation).

Treatment:

Drug: HST5040

Placebo

Experimental group

Description:

Placebo in addition to standard of care.

Treatment:

Drug: Placebo