I believe the approach by Google DeepMind is very promising, however patient data protection is a major issue, and not a trivial one at that, requiring serious tightening of the legal regulations as to what with these data can and cannot be done (about how they should be anonymised, protected, stored, shared, etc.). After all, Google is a private company and the events of the past (allowing back doors to security agencies, as Edward Snowden disclosed to the world -- to name but one example) should be a lesson as to how private data can without public knowledge find their way to where they do not belong.

https://www.theguardian.com/technology/2016/jul/05/google-deepmind-nhs-machine-learning-blindness

https://deepmind.com/applied/deepmind-health/