Reviewers Ask Tough Luxturna Questions

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FDA medical reviewers are posing tough questions for members of the Cellular, Tissue, and Gene Therapies Advisory Committee when they meet 10/12 to consider a BLA submitted by Spark Therapeutics for Luxturna (voretigene neparvovec) for treating patients with vision loss due to confirmed biallelic RPE65 mutation-associated retinal dystrophy. A briefing document released in advance of the meeting says that while the gene therapy met the main criteria for efficacy, questions about its use remain.

In the key study, the reviewers say, patients had a significant two point or more improvement in light levels in both eyes, but checking visual acuity showed that patients failed to demonstrate a significant improvement in that secondary endpoint.

Questions posed for committee members seek their opinion on: 

  •          the clinical meaningfulness of a two-light level improvement;
  •          the optimal disease stage to treat patients with bilallelic RPE65 mutation-associated retinal dystrophy, especially the stage of clinical presentation at which therapy benefits outweigh risks, a reasonable minimal age for treatment, and how data from subjects with significant vision loss can be extrapolated to patients with earlier stages of disease with or without measurable vision loss before treatment; and
  •          the potential benefits and risks of repeat administration of the drug into one eye and what, if any, additional data are required to support such administration.

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