Particularly if I was in the 30% that still dies from it.

Although if I were to die from it I wouldn't probably be able to call it anything.

But that is cureable, just not guaranteed. You are more likely to live than die with this treatment.

That's probably why they use the word "curable"

Or cure just mean for the people which it works for, they are cured. Contrast with medicines slowing down the effects such as HIV medicine.

In other words, cure is probably the right word, just not for everybody.