There are a few treatments that work well but are just to expensive to be viable. For instance a few decades there was a gene therapy developed for people with

There are a few treatments that work well but are just to expensive to be viable. For instance a few decades there was a gene therapy developed for people with a gene deficiency that blocks them from digesting fats. If I remember correctly it was developed in Canada. Even though it cured the people, it was and is too expensive for it to be used at the moment.