On average about 99 % of all drugs in clinical trials never actually make it to approval, and drugs are still failing late - stage trials in 2017. (businessinsider.com)
Some patients have come through early stage trials to be declared effectively cancer free. (bioprocessintl.com)
Early - stage trials of embryonic - stem - cell therapies for macular degeneration — progressive damage to the retina that causes blindness — are already under way. (scientificamerican.com)