I'm an avid researcher in biotechnology/bioinformatics. I would have to respectfully disagree stating that the etiology - cause of the disease in many cases are only just been realized through the assistance of new (2014) biotech profiling techniques, which have shown the biochemical structure of various DNA replication mechanisms, namely CRISPR-Cas9. Through the assistance and evolution of computing power, many molecules or potential drugs can be virtually administered and studied.
It is a long haul to get any drug on the market, but I suspect in the next decade, the amount of treatment potentials would exponentially increase