Well scientific knowledge can help with diseases because say for ex: scientist 1 and scientist 2 are trying to treat breast cancer on a girl, they do the exams and tests on her and all, but when they receive some news about cures or risks and etc, they may improve their methods, be more cautious, or use more techniques, so its basically like a preparation tool for scientists so they know what's ahead.
Scientific knowledge may be able to tell us what the disease is immune to, and which kind of cure would actually work against the disease present, and which would be ineffective or may even help the disease spread and mutate.
