Brutal year in the search for Alzheimer’s treatment

The search for an Alzheimer's disease treatment has been unsuccessful for the past 14 years.

The latest failure came in September, when Axovant said it failed a key late-stage trial for its drug, intepirdine.

Alzheimer's affects more than 5 million Americans, a number that's expected to balloon to 13.8 million by 2050 . There are only four drugs that have been approved to treat the symptoms of the disease, and the most recent drug approval happened in 2003.

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Written by Lydia Ramsey for businessinsider.com

(photo credit AP/Alastair Grant)