One of the primary premises of the Bible is to explain how to be saved, not how to be cured of any disease otherwise the Bible would be a lot bigger than it is. LOL! I believe that if there were beings on some other planet somewhere in His universe, he would have mentioned it, at least in passing.
I love these discussions; I learn much about how people think.
I also believe He would have mentioned it. However, we cannot be dogmatic about such things. An argument from silence at best produces weak probabilities and can never produce certainties.