Zydus Lifesciences completes enrolment of Phase II clinical trial of Usnoflast in patients with Amyotrophic Lateral Sclerosis

The Phase II clinical trial has recruited 24 ALS patients across 7 clinical trial sites in India and will study safety, tolerability, pharmacokinetics and pharmacodynamics of Usnoflast. The change from baseline in the Revised Amyotrophic Lateral Sclerosis Functional Rating Scale (ALSFRS-R) score will be measured at week 4, week 8 and week 12, as the trial’s primary endpoint is the placebo-controlled, randomised, double-blind Phase 2 clinical trial.

The trial will also evaluate Key Secondary Endpoints including Slow Vital Capacity (SVC), a predictor of functional loss in ALS and neurofilament levels at week 4 and week 12.

Usnoflast (ZYIL1) is a novel, oral small molecule NLRP3 inhibitor. Studies have demonstrated that ZYIL1 is highly potent in human whole blood assay and can suppress inflammation caused by the NLRP3 inflammasome. Usnoflast was found distributed in the brain and CSF of various nonclinical species including mice, rats and non-human primates. The efficacy of Usnoflast has been established in several validated pre-clinical models of neuroinflammation, Parkinson’s disease, Inflammatory Bowel Disease (IBD) and Multiple Sclerosis (MS).

The candidate, Usnoflast, has an acceptable ADME profile, with a good safety margin. In Phase I studies, Usnoflast was found to be safe and well-tolerated [NCT04731324, NCT04972188]. Zydus has initiated a Phase 2 clinical study of Usnoflast in Ulcerative Colitis [ClinicalTrials.gov ID NCT06398808]. Zydus has established the Phase 2 proof-of-concept in CAPS patients [NCT05186051] and has now published the data in Clinical Pharmacology in Drug Development.

The USFDA has granted Zydus an ‘Orphan Drug Designation’ for Usnoflast to treat patients with Cryopyrin Associated Periodic Syndrome (CAPS), a rare auto-inflammatory disease.

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