...In the study, researchers at Case Western Reserve University School of Medicine gave mice mega-doses of bexarotene, a drug used to treat a type of skin cancer called cutaneous T-cell lymphoma. Within 72 hours, the mice showed dramatic improvements in memory and more than 50% of amyloid plaque -- a hallmark of Alzheimer's disease -- had been removed from the brain...

http://edition.cnn.com/2012/02/09/he...ers/?hpt=hp_t2

Alzheimer's brain plaques 'rapidly cleared' in mice:

another link: http://www.bbc.co.uk/news/health-16945466