11/06/2026
Encouraging news from the Avidity/Novartis trial using targeted siRNA to suppress DUX4 in . The therapy, del-brax, is an investigational antibody oligonucleotide conjugate (AOC) โ a new class of RNA therapeutics โ showing potential to become the first disease-modifying treatment for FSHD.
Del-brax is designed to address the root cause of FSHD, the aberrant expression of DUX4, in previously hard-to-reach muscle cells.
The FORTITUDE Phase I/II study (NCT05747924) is a randomised, double-blind, placebo-controlled clinical trial evaluating safety, dosage, and exploring efficacy. The FORTITUDE study met its endpoints: a change in plasma concentration of KHDC1L, a DUX4-regulated circulating biomarker, and a change from baseline in the levels of creatine kinase, a marker of muscle damage.
This is an encouraging and vital step in the research, but it still needs to be shown that del-brax has an impact on disease in FSHD patients, beyond those two biomarkers. Phase III clinical trials are now underway in the US and Europe to evaluate the effects further.
We will keep you updated. Join our Cure FSHD Registry to ensure you are trial ready to take advantage of future progress in this or other FSHD therapy trials in Australia.
Join the Cure FSHD Patient Registry here: https://fshd-app.weguide.com.au/
๐Read the Novartis announcement here: https://www.novartis.com/news/media-releases/novartis-delpacibart-braxlosiran-del-brax-phase-iii-study-facioscapulohumeral-muscular-dystrophy-fshd-meets-primary-biomarker-endpoint?fbclid=IwY2xjawSXVW5leHRuA2FlbQIxMABicmlkETFEYm5aM2JuTUREeGpuNE9zc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHsosx0vnBqHH5Kp7cKKY8q86_BD3kE4SeUYdDOQr2ro9Ww_Ab-I49g2-60TL_aem_q-51PGRw2GO4s3I1QLkIKQ