It all depends on the variables in my life at that point in time. If there was no cure for my disease, and I was a loner, then I would. I might as well do something beneficial with my life, rather than let it rot away.
However, If there was no cure and I had a loving family, than I would have to consult with them and make the deicions based on their opinions.
If I had a life threatening illness with no cure right now, I would take experimental drugs. However, if I had a controllable disease that could prolong my life, I would not because I am young and I feel that there is too much I have not seen yet.