I am not understand what the GP meant, but it could be that the effect should occur within 7 months with RTX. If one year elapsed, then they know who's responded to the drug and who didn't. They could still follow up those with response, but they would be unblinded... Guess it sounds smarter to do a 2 year study. It is better than a 1 year study. The problem could be that many will relapse after 2 years. I think 1 year from the last infusion to the end of the study is way to short to know how patients that will relapse.