What is the fine-grained topic of the following text: Age-adjusted death rates from diabetes dropped 5.3%, leaving an opening for deaths from Alzheimer’s disease to overtake diabetes as the sixth leading cause of death in the U.S. Nearly 73,000 Americans died of Alzheimer’s in 2006, according to the preliminary data. Only return the topic.
Alzheimer's disease overtaking diabetes as the sixth leading cause of death in the U.S.