Alzheimer's disease: Why is it so hard to find a treatment?

Read any article about Alzheimer's and you'll think the next cure for this devastating disease is right around the corner. But for patients and their families, the stark reality is that it's been more than a decade since memantine, the last molecule against Alzheimer's, was approved in Europe and the US.

Since then, there has been a number of trials for different drugs, but none have been successful. The drugs that do exist are not intended to cure Alzheimer's sufferers – they are only able to attenuate the symptoms and slow down the disease's progression.