UCL RPE65 Gene Therapy Trial Shows Benefit in People with Leber Congenital Amaurosis Type 2 for up to Three Years After TreatmentAndi MSkilton5 May 2015
We are delighted to be able to announce that yesterday, Monday 4th May, the long-term results of our RPE65 gene therapy trial for Leber Congenital Amaurosis Type 2 (LCA2) were published in the prestigious New England Journal of Medicine.
Begun in 2007, this was the world’s first-in-human trial of gene therapy to treat an inherited form of blindness. Twelve patients were enrolled in the trial over the course of six years and followed up over a three year period to assess the long-term safety and benefit of treatment with gene therapy in this Phase I/II clinical trial.
A number of patients enrolled in the trial experienced gains in night vision for a period of two to three years with greatest improvements seen in the first 6 to 12 months after treatment. This is consistent with the published results and interim findings of other studies of RPE65 gene therapy.
This study confirms our preliminary findings (published in NEJM, 2008) that gene therapy can improve night vision, providing further evidence of benefit in inherited blindness.
Professor James Bainbridge, lead clinician for the trial
Our latest results provide confirmation of efficacy but the data, together with results of a parallel study in dogs, indicate that the demand for RPE65 is not fully met with the current generation of vectors. We have concluded that early intervention using a more potent vector, expressing higher levels of RPE65 is likely to provide greater benefit and protection against progressive degeneration.
Professor Robin Ali, lead for the research group
The group has now developed a new, more powerful gene therapy vector and is aiming to test this in a second clinical trial funded by The UK Medical Research Council.
Links to further information:
- The full results from this study can be found in the NEJM:
- Bainbridge, JWB, Mehat MS, Sundaram V, et al. Long-term Effect of Gene Therapy on Leber Congenital Amaurosis. New England Journal of Medicine. 2015;10.1056/NEJMoa1414221
- Bainbridge, JWB, Smith AJ, Barker SS, et al. Effect of Gene Therapy on Visual Function in Leber’s Congenital Amaurosis. New England Journal of Medicine. 2008; 358: 2231-9