Results can take an eon to surface - data has to be analyzed, articles written, submitted to peer reviewed journals, reviewed by peers - who will have questions and want changes, and the finally the results slotted for publication some months ahead. Or the researchers could just jump ahead and say something about "promising" and will be planning next phase of clinical trials....all of this on a drug recognized as safe in another use! It's agonizing. But if they were to go too fast and overlook some safety issue, the lawsuits could be massive.