RE: Retinal Cell & Gene Therapy Summit27 Apr 2019 23:30
Grizzly is literally quoting nothing but fact, I honestly can't see what your issue is top tiger, and I rather think you owe him an apology.
Taverham summarises the point very accurately - the phase 1 initial cohort were tested to essentially evaluate the safety of the procedure (ie no adverse effects etc). They initially test people with the most severely deteriorated vision as, if the procedure was to be adversely effective, then these people have the least to lose (you can't get more blind than completely blind, which is what they were).
Once they've established the proceedure is safe, then they get permission to test it on people who are of very limited vision, but not completely blind. Even on these subjects, they are required to perform the procedure on the most damaged eye, in case anything goes wrong and it makes the vision worse. The procedure has proven extremely successful of this cohort of 3 subjects, and as a result they are now permitted to test it on people with better vision.
The trials are rigorous and very safety conscious, that's why they have to be slowly ramped up and therefore take so long to conclude.