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
“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
“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.
In the Phase 1 portion of the study, a one-time dose of 25 mg (N=3), 50 mg (N=4) or 75 mg (N=3) of lonvo-z was administered via intravenous infusion and plasma kallikrein protein levels were measured along with HAE attacks. At the time of the
Safety
Across all three dose levels, lonvo-z has been well tolerated and continues to demonstrate a favorable safety profile consistent with earlier data presented at EAACI in 2024. The most frequent adverse events during the study period were infusion-related reactions (IRRs). IRRs were mostly Grade 1 and resolved with all patients receiving the full dose. With up to 3 years of follow-up, no treatment-emergent serious adverse events were observed, and no treatment-related adverse events were observed during the period following 28 days after dosing.
Clinical Development Plans
Intellia’s global Phase 3, randomized, double-blind, placebo-controlled HAELO trial is ongoing to assess the safety and efficacy of lonvo-z at the 50 mg dosage. The Company announced today the HAELO trial has successfully completed screening ahead of schedule, with over half of the patients being screened in
About the Lonvoguran Ziclumeran (lonvo-z, also known as NTLA-2002) Clinical Program
Intellia’s ongoing Phase 1/2 study is evaluating the safety and efficacy of lonvo-z in adults with Type I or Type II hereditary angioedema (HAE). The Phase 1 portion of the study is an international, open-label study designed to identify the dose level of lonvo-z selected for further evaluation in the Phase 2 portion of the study. Enrollment in both portions of the Phase 1/2 study is complete. Intellia dosed the first patient in the global Phase 3, randomized, double-blind, placebo-controlled HAELO trial in January of 2025. Visit clinicaltrials.gov (NCT05120830) for more details.
About Lonvo-z
Based on Nobel Prize-winning CRISPR/Cas9 technology, lonvo-z has the potential to become the first one-time treatment for hereditary angioedema (HAE). Lonvo-z is an investigational in vivo CRISPR-based gene editing therapy designed to prevent HAE attacks by inactivating the kallikrein B1 (KLKB1) gene, which encodes for prekallikrein, the kallikrein precursor protein. Interim Phase 1/2 clinical data showed dramatic reductions in attack rate, as well as consistent, deep and durable reductions in kallikrein levels. Lonvo-z has received five notable regulatory designations, including Orphan Drug and RMAT Designation by the U.S. Food and Drug Administration (FDA), the Innovation Passport by the U.K. Medicines and Healthcare products Regulatory Agency (MHRA), Priority Medicines (PRIME) Designation by the European Medicines Agency, as well as Orphan Drug Designation (ODD) by the European Commission.
About
Forward-Looking Statements
This press release contains “forward-looking statements” of Intellia Therapeutics, Inc. (“Intellia” or the “Company”) within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, but are not limited to, express or implied statements regarding Intellia’s beliefs and expectations concerning: the safety, efficacy, success and advancement of its clinical programs for lonvoguran ziclumeran or “lonvo-z” (also known as NTLA-2002) for hereditary angioedema (“HAE”), including the ability to successfully complete its global Phase 3 HAELO study; its expectation to present additional data regarding lonvo-z, including reporting outcomes of the Phase 3 HAELO study in the first half of 2026 and presenting new and longer-term data from the Phase 2 portion of the ongoing Phase 1/2 study of lonvo-z in the second half of 2025; and its expectation to be able to support a biologics license application for lonvo-z for the treatment of HAE by 2026 for a
Any forward-looking statements in this press release are based on management’s current expectations and beliefs of future events and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to: risks related to Intellia’s ability to protect and maintain its intellectual property position; risks related to Intellia’s relationship with third parties, including its contract manufacturers, licensors and licensees; risks related to the ability of its licensors to protect and maintain their intellectual property position; risks related to Intellia’s ability to protect and maintain its intellectual property position; risks related to valid third party intellectual property; risks related to Intellia’s relationship with third parties, including its licensors and licensees; risks related to the ability of its licensors to protect and maintain their intellectual property position; uncertainties related to regulatory agencies’ evaluation of regulatory filings and other information related to our product candidates, including lonvo-z; uncertainties related to the authorization, initiation and conduct of studies and other development requirements for our product candidates, including uncertainties related to regulatory approvals to conduct clinical trials, including our ability to complete the Phase 3 HAELO study for HAE; the risk that any one or more of Intellia’s product candidates, including lonvo-z, will not be successfully developed and commercialized; and the risk that the results of preclinical studies or clinical studies will not be predictive of future results in connection with future studies for the same product candidate or Intellia’s other product candidates. For a discussion of these and other risks and uncertainties, and other important factors, any of which could cause Intellia’s actual results to differ from those contained in the forward-looking statements, see the section entitled “Risk Factors” in Intellia’s most recent annual report of Form 10-K and quarterly report on Form 10-Q, as well as discussions of potential risks, uncertainties, and other important factors in Intellia’s other filings with the Securities and Exchange Commission. All information in this press release is as of the date of the release, and Intellia undertakes no duty to update this information unless required by law.
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Source: Intellia Therapeutics, Inc.