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In response to your question "even if they found a cure tomorrow, hasn't the damage already been done". It depends on the nature of the "cure". More properly we should say cure or new effective treatment. The growth factors such as GDNF reportedly revive dormant nerve cells. Fetal transplants (not necessarily human fetal tissue) offer promise. Drugs which can be tailored to effect only the desired receptors are a possibility. these are just a few example which come to mind. The point being there is tremendous promise for everyone with Parkinson's especially if we can get increased research funding.