Amgen also said that several monkeys that had received high does of the drug suffered irreversible brain damage, and subsequently died.
A spokesman for Amgen, David Polk, explained that the company had stopped providing GDNF because of 'serious safety concerns' and the absence of any demonstrated medical benefit.'

This a little backwards and severely misleading. The monkeys were first euthanized, and then the brain damage found. The above statement makes it sound like the brain damage killed them.

Paula