Intellia Pauses Gene Therapy Phase 3 Trials
Intellia Therapeutics has paused patient dosing and screening for its MAGNITUDE and MAGNITUDE-2 Phase 3 trials of nex-z, a CRISPR-based therapy for transthyretin amyloidosis with cardiomyopathy and polyneuropathy, due to a recent patient injury. The decision follows a 10/24 report on a patient injury in the MAGNITUDE trial, according to the company. The patient was dosed on 9/30 and experienced Grade 4 liver transaminase elevation and increased total bilirubin, triggering a protocol-defined pause, it says, adding that the patient was hospitalized and is receiving medical care.
The company says it is consulting with external experts, exploring potential risk mitigation strategies, and engaging with regulatory authorities globally to determine a safe path to resume enrollment. The MAGNITUDE trial currently has over 650 patients enrolled, and MAGNITUDE-2 has 47 patients enrolled, with more than 450 patients estimated to have received nex-z.
Nex-z, based on CRISPR/Cas9 gene editing, is designed to inactivate the TTR gene to reduce the production of transthyretin protein, according to Intellia. Interim Phase 1 data previously showed consistent, deep, and long-lasting TTR reduction.
Intellia is developing nex-z in collaboration with Regeneron Pharmaceuticals.