I'm hesitant to say, "No, never." However, it would be extremely difficult to the point of being nigh impossible even if not technically impossible, so I'll go with that option as even if it's not scientific law, I see it as effectively true.
It's a lot of brutal, varied training with a lot of potential for injury and setbacks just in training, never mind the fights themselves. As others have said, there's just so much that could go wrong. Plus, there's a ticking clock and that career would have to be extremely well managed atop the other factors.