PDE6A Gene Therapy for Retinitis Pigmentosa

"The first 3 patients (C1) will receive the intermediate dose 1x1010 vg. After injection of the 3rd patient of C1, the DMC will give a go/no go decision. If 'nogo', a lower dose (5x109 vg) will be given to the next group of 3 patients (C2). The DMC will give a go/no go decision. In case of a go decision, 3 further patients (C3) will be treated with the same dose. In the case of a no-go decision, the next dose will be the minimal dose 1x109 vg. In case of a 'go' decision of the DMC after the third patient, the next 3 patients will receive a subretinal injection of vector at the highest dose 5x1010 vg. The DMC will give a go/no go decision after review of all safety data available at D30 of cohort 2. If safety data is considered favourably by the DMC, then 3further patients (cohort 3) will be treated with the same dose (5x1010 vg). Should any safety concerns arise, the last three patients (cohort 3) will receive the intermediate dose (1x1010 vg)."