Intellia Therapeutics Announces Positive Three-Year Data from Phase 1 Trial of Lonvoguran Ziclumeran (lonvo-z) in Patients with Hereditary Angioedema (HAE) at the European Academy of Allergy and Clinical Immunology Congress

• With up to three years of follow-up, a single dose of lonvo-z led to a 98% mean reduction in monthly HAE attack rate in all 10 patients
• All 10 patients were attack-free and treatment-free for a median of 23 months through the latest follow-up, demonstrating the potential of lonvo-z to become the first one-time therapy for most HAE patients
• Lonvo-z was well tolerated and continues to demonstrate a favorable safety profile
• The global Phase 3 HAELO trial of lonvo-z has concluded screening ahead of schedule with more than half screened from U.S. sites; Intellia to provide an update on enrollment in the future

CAMBRIDGE, Mass., June 15, 2025 (GLOBE NEWSWIRE) -- Intellia Therapeutics, Inc. (NASDAQ:NTLA), a leading clinical-stage gene editing company focused on revolutionizing medicine with CRISPR-based therapies, today announced three-year follow-up data from the Phase 1 portion of the ongoing Phase 1/2 study in patients with HAE after receiving a single dose of lonvoguran ziclumeran (lonvo-z, also known as NTLA-2002). Results were shared in an oral presentation at the European Academy of Allergy and Clinical Immunology (EAACI) Congress 2025, held June 13-16 in Glasgow, United Kingdom.

“Today’s results underscore the promising potential of Intellia’s approach to gene editing therapy – a one-time treatment that was well tolerated and offered a highly differentiated, durable effect for patients suffering from a serious disease,” said Intellia President and Chief Executive Officer John Leonard, M.D. “Seeing all 10 patients in the Phase 1 portion of this study free from both HAE attacks and chronic therapy at nearly two years of median follow-up is incredibly encouraging. These data fuel our optimism for the outcomes of our ongoing Phase 3 HAELO study, which we expect to report in the first half of 2026, and highlight the strong value we believe it will offer patients, physicians and payers.”

“People living with HAE often report a reduced quality of life because they worry about the likelihood of their next attack, either because they still experience attacks or are reminded of it by their use of chronic therapy,” said Dr. Joshua Jacobs, Medical Director, Allergy and Asthma Clinical Research, Inc. “Based on the data, it is reasonable to expect lonvo-z could offer patients the potential to be free from both physical HAE attacks and the burden of managing chronic HAE treatment.”