No doubt this is positive data. I could stop here. Most people will read this as the drug is 80% effective, a great result. Let me explain why the data is not actually that meaningful. *(although still good).
These data are collected from people who have stayed on the drug from week 25 through 96. We already knew that about half of the people in the initial trial got great results early on. That meant that about half were not all that good. OK, I'll take half of the market! But let's assume that in the first half year, the half that did not tolerate/respond to the drug opted to discontinue. That means only the ones who responded well were in the pool of patients from week 25+. So another way of reading these date is: Patients who did well early on continue to do well over the next year! That is nice to know, but really not more than confirmation that things remain OK. Of course the bad result would have been that something got worse over time - and that didn't happen.
Hold the course.