>>>Which presents the problem, let's say the most common 50% of all cancers are easily cured by drug X. Well the other 50% are all less common and moving to 100

>>>Which presents the problem, let's say the most common 50% of all cancers are easily cured by drug X. Well the other 50% are all less common and moving to 100% is only going to get harder as you progress. But for those who are in the 50% who can be cured in the first wave... ... and maybe one of them will go on to develop the cure that helps the remaining 50%.