Until there are better treatments, there will be little demand for tests that show you have or are destined to get Alzheimer’s disease, several experts said. “It?s kind of like finding high cholesterol” but not having drugs that can lower it, said Dr. Mark Sager, director of the Wisconsin Alzheimer?s Institute at the University of Wisconsin-Madison. He was involved in a study of a different Alzheimer?s-linked gene that will be reported this week.