Inozyme Pharma Announces Positive Interim Data for INZ-701 in Infants and Young Children with ENPP1 Deficiency and Key Program Updates
Monday, January 13, 2025
Inozyme Pharma, Inc., a clinical-stage biopharmaceutical company developing innovative therapeutics for rare diseases that affect bone health and blood vessel function, today announced positive interim data from its ENERGY 1 trial and Expanded Access Program (EAP) evaluating INZ-701 in infants and young children with ENPP1 Deficiency, completion of enrollment in the ENERGY 3 pivotal trial in pediatric patients with ENPP1 Deficiency and regulatory guidance for the ASPIRE pivotal trial in children with ABCC6 Deficiency.
“We believe these highly encouraging outcomes in infants and young children, combined with previously reported data from adult studies, provide strong support for the potential impact of INZ-701 on rickets, a key clinical endpoint in the ongoing pivotal ENERGY 3 trial, and underscore its potential to address the significant needs of pediatric patients,” said Douglas A. Treco, Ph.D., CEO and Chairman of Inozyme Pharma.
Matt Winton, Ph.D., Senior Vice President and COO of Inozyme Pharma added, “Our team and global collaborators worked tirelessly to identify and diagnose these rare patients and initiate treatment as quickly as possible. Tragically, in some cases, we have been unable to begin treatment before the infant passed. This only deepens our commitment to the patient community and strengthens our resolve to address unmet needs across all populations as we advance INZ-701.”
Positive Interim Data from the ENERGY 1 trial and Expanded Access Program
Interim data from the ENERGY 1 trial (three infants) and the EAP (two infants and one child -2.5 years old) evaluated patients with generalized arterial calcification of infancy (GACI), a severe manifestation of ENPP1 Deficiency. Patients were treated with INZ-701 for periods of three weeks to 22 months. The data presentation can be accessed here on Inozyme’s Investor Relations site.
Key results include:
- Improved Survival: 80% of infants treated with INZ-701 survived beyond their first year, compared to a historical survival rate of approximately 50%.
- Reduction in Arterial Calcifications: Substantial reductions or stabilization of arterial calcifications were observed in all surviving patients, including complete resolution in some instances. There was no evidence of progression of arterial calcification in any patient.
- Improved Heart Function: Stabilization or improvement in left ventricular ejection fraction (LVEF) was noted in all surviving patients.
- Reduced Risk of Rickets: No radiographic evidence of rickets was observed in patients evaluated beyond one year of age and at-risk of rickets development (n=3), supported by stabilization or increases in serum phosphate levels.
- Favorable Safety Profile: INZ-701 was well-tolerated, with no serious treatment-related adverse events in infants and young children. Observed treatment-related events were limited to mild injection site reactions. Across studies to-date low, often transient, anti-drug antibody (ADA) levels were noted in some children and adults, with no impact on pharmacokinetics (PK) or pharmacodynamics (PD). In the ENERGY 1 trial and EAP, higher ADA levels in some infants significantly affected PK and PD. In infants with high ADA levels, data collected pre- and post-dosing demonstrated substantial transient increases in PPi and drug exposure following INZ-701 administration, consistent with the clinical effects observed. ADAs were not associated with adverse events in any patient.
Enrollment Complete in ENERGY 3 Pivotal Trial
The Company today announced completion of enrollment in its ENERGY 3 pivotal trial of INZ-701 in patients with ENPP1 Deficiency aged >1 to <13 years. Based on recommendations from the U.S. Food and Drug Administration (FDA), the primary endpoint of plasma PPi should be supported by consistent trends in appropriate clinical endpoints, such as radiographic global impression of change (RGI-C), a measure for progression or improvement of rickets. As per agreement with the European Medicines Agency (EMA), plasma PPi and RGI-C are co-primary endpoints, with a relaxed p-value of <0.2 for RGI-C.
With 25 patients enrolled, the trial’s 2:1 randomized design provides >90% power to detect meaningful differences in RGI-C between treatment and control groups. Strong patient interest and scheduled screenings may result in the enrollment of additional participants in January 2025. Inozyme anticipates completing the one-year dosing period for all patients by January 2026, with topline data expected in early 2026.
Source: inozyme.com
