If it's based on the one suicide and extrapolating to a death rate of 0.3%, I'd call it a bit of a stretch. Yes that would make it the leading cause of death if

If it's based on the one suicide and extrapolating to a death rate of 0.3%, I'd call it a bit of a stretch. Yes that would make it the leading cause of death if it did continue, but given the tiny sample size and single occurence (which may or may not be related), I don't think you can draw any conclusion. Given that uncertainty concluding the study to work on the drug before trialling it again makes a lot of sense.