From cancer to nerve regrowth

Cancer researchers at Columbia University Medical Center have found that a protein known for driving the growth of cancer also plays a surprising role in restoring the ability of neurons to regenerate, making it an important target for addressing spinal cord damage or neurological diseases like Alzheimer’s.

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Dr. Iavarone added that there is no chance that such a therapy would cause cancer in the brain or spinal cord. “Neurons have completely lost the ability to create new cells so there’s no danger of creating a tumor. The only growth they’re capable of is regeneration of their axons,” he said.

I'm not a doctor (but I play one on TV), but from what I've heard that last statement is not completely true.  A number of people have found that nerve cells can replenish themselves, albiet slowly.  I don't think this would be much of a problem though.