Oh, goodness!!! Just because the cure in the movie mutated the population, doesn't mean it's gonna happen in real life!
It's just a thought.....and we can have a backup.....we could 'create' a stop codon in case it gets 'deadly'.....
As far as I know, the best way to be immune to cancer and diseases is to eat, drink and live healthy....get a bit dirty sometimes, and not to be too clean; stop using too much chemicals in your life.....and you're guaranteed to live long.....go upto 100 yrs easily.....
*Sadly, this century has brought more and more troubles; although technology has improved, it has caused sedentary lifestyle....leading to heavy diseases..... (incomplete statement...)