November 20, 2025

Amid Safety Investigation, ATTR Gene Therapy Buoyed by Good 3-Year Data

IntelME Verdict

Safety Concerns

TL;DR

Intellia Therapeutics pauses Phase III trials for nexiguran ziclumeran due to safety concerns, despite promising 3-year data showing sustained TTR reduction and clinical benefit.

Analysis

The pause in Intellia's Phase III trials for nexiguran ziclumeran due to safety issues, despite positive 3-year data, highlights the delicate balance between efficacy and safety in gene therapy development. Biotech/pharma professionals will closely monitor how this event shapes regulatory scrutiny, patient safety considerations, and the future development of CRISPR-based therapies.

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