They're investigating the use of a drug that they don't understand to treat a condition that they don't understand...You'd probably be shocked to figure out how often this happens - and it used to happen a lot more in no small part because we didn't have the tools we have today: MRIs and better microscopes and other tech has really helped our understanding of the body. We are still figuring out how exactly the body works, after all, to the point that we occasionally discover a new body part. Of course we are going to do things we don't understand. Yet.
This isn't limited to medicine, either.
Maybe they want something to prescribe. For a lot of diseases, that's better than nothing. For example, I have MS. They know more than they used to about MS, but most of my life they've not known enough. I have medicine that isn't a cure, but I'll take it. Modern medicines mean that modern folks with MS have a much better quality of life than folks that didn't have medications. I'm more likely to have mobility and things like that. I'll take it.
My ex was schizophrenic. Medicine gave them a life. They still couldn't work, but they weren't suffering as much either. Again, not a cure, but help.
Imperfect cures or medicines that treat the symptoms are so much better than no help at all. This is where a lot of medicine starts - treating a symptom, and by doing so learning a bit more about the disease or affliction.