Michael J. Fox hails new Parkinson's test as a monumental breakthrough.

Actor Michael J. Fox has promoted a new spinal fluid test that can detect Parkinson's in living people, calling it "one of the most significant Parkinson's breakthroughs in decades." The test is "remarkably accurate" and can allow for diagnosis before symptoms arise, as well as tracking how biological factors may impact the risk, onset, and progression of the disease. Fox, who suffers from Parkinson's, said the test marks a new era in Parkinson's research. The disease, which affects approximately 500,000 Americans, currently has no cure.