It sounds kind of like an ethical question to me.

If the patient were to live 10 + additional years, additional years depending on the medicine s/he takes, I'd go for the third option if the treatment could be done just before the 10th year. If the treatment is successful, s/he gets a new life. If it does't work, s/he would not be able to live additional 2-5 years; however, s/he wouldn't have to undergo the pain that the treatments in the option 1 and 2 will bring about during those additional years.