They are a required step along the way to human trials.

But over 90% of drugs that show promise in rodents flunk out in human trials.

Something working in rodents is an indicator that it might be worth doing testing to see if it works and is safe for humans. But if you bet against it panning out, you'd still be right the overwhelming majority of the time.

The only thing you can project from rodent trial success is that it is worth continuing to study. It should not guide any human usage at that point.