Dear Philippe, I read your document later.
I have to disagree with the word "prior".
It makes it sound like, is has gone wrong long time ago, and there is nothing what we can do.
Big data for machine learning can be build very quick, we have millions of people in healthcare every day.
Imagine a GP making a picture of an eye, or a part of skin, and gets within a second a good explanation about what is there to see.
It is cheap. If many GP's agree to use an app for classifying viewable symptoms, the supporting big database will grow fast.
I also have to agree with Karsten, it is not only a disease which needs to be cured, but it is a person having that disease. So, age, weight, gender, ethnicity, profession, social status, country, those are all factors which limit the search area in which the machine learning database must find what it sees.