http://news.bbc.co.uk/1/hi/health/4188677.stm
"Scientists have reversed the damage caused to the brain by Alzheimer's disease during tests on mice.
The US team used an antibody to remove the build up of potentially damaging deposits from the area of the brain responsible for memory and cognition.
The treatment reversed the nerve cell damage in days"
Now we just need to find a cure for cancer and we'll (almost) be set.
Interesting how there was some degree of damage reversal. Conventional wisdom used to be that there was very little plasticity of the brain after a certain age. New neurons would stop being produced, and that was it.
Of course, we now know that isn't the case. I'm curious what form of repair was involved here though: neurogenesis or existing surviving neurons recovering and reestablishing connections?