Nicola Longo MD, PhD, and Mark Roberts, MD

Nicola Longo MD, PhD
Professor and Vice Chair of Human Genetics,
Allen and Charlotte Ginsburg Chair in Precision Genomic Medicine,
Division of Clinical Genetics, Department of Human Genetics,
University of California at Los Angeles (UCLA), Los Angeles, CA, USA

Mark Roberts, MD
Professor and Consultant Neurologist,
University of Manchester, Manchester, UK
Research Lead for Adult Metabolic Medicine at 
Salford Care Organisation, Manchester, UK

Drs.Longo and Roberts discussed the current status of gene therapies in rare neuromuscular disorders in this eight-part podcast series. This is derived from the symposium that was presented at World Symposium 2025 in San Diego, California on February 4th through 7th, 2025 and is intended for healthcare professionals only.

This podcast includes information about investigational compounds that do not yet have a regulatory approval or authorization for a specific indication. The safety and efficacy of the agents under investigation have not been established and contents of this podcast shall not be used in any manner to directly or indirectly promote or sell the product for unapproved uses. The views, thoughts, and opinions expressed in this presentation belong solely to the author and are subject to change without notice. The contents of this presentation do not constitute an endorsement of any product or indication by Astellas.

In this part, Dr. Roberts will discuss lessons learned from gene therapy trials.

Mark Roberts, MD
When we think about the challenges of actually doing clinical trials with these gene therapies, there's a huge development stage in terms of picking the right viral vector with the right surface receptor. That's a major piece of work. That can often take years. The preclinical work is obviously very important as indeed is understanding the natural history because it's really not practical to do placebo-controlled trials of gene therapies.

In contrast to other studies, when we turn to phase 1 and phase 2, you'll notice that the patient numbers are often quite small. One is having to think carefully about surrogate measurements of response. Especially when in phase 3 studies, we may be thinking about withdrawing the existing, for example, enzyme replacement therapy because we believe the gene therapy will then be effective.
That's just a few snapshots of where we've come and there's a lot more work to be done.

In the next part, Dr. Longo will discuss the current treatment landscape and limitations in lysosomal disorders.