It all depends on what you mean by cure. People usually mean different things by the same word. If by cure you mean "100% fluency" no its not possible. What I mean by cure is "gone into remission and doesnt come back after years and the only remnant is a very minor stutter that doesnt bother you and is hardly noticeable by anyone else..." then yes it's definitely possible. My dad did it, he used to have a very bad stutter as a kid and overcame it through a variety of speech practices.