Although I think starwed comes very close to answering Sel, I'm not entirely certain that the essence of Sel's question has been truly addressed in all of the fascinating discussion that has gone on here. What Sel wants is a word that specifically states that the disease has no cure at this time, but also that it is likely to be cured at some future time.
In response, starwed points out that "incurable" does not preclude a future cure, and I think this is right, but if I am not mistaken, Sel wants something more. What seems to be wanted is a stronger implication within the desired word that although the disease does not have a cure, a cure is expected.
If I am correct about this, then I have to say to Sel, in my 36 years of experience in medicine, I have never encountered such a word. That doesn't prove such a word doesn't exist, but I'd bet quite a lot on its nonexistence.