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The symptoms of Parkinson's disease can vanish briefly in the face of stress or a strong emotion. Now scientists are searching for a treatment based on this phenomenon, a form of the placebo effect.
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A leukemia drug seemed to help patients with Parkinson's disease. But critics say the results are equivocal and could raise false hopes.
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The pharmaceutical giant said it would be abandoning its neuroscience development programs and allocating its spending elsewhere. The move also means the company will lay off some 300 employees.
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By targeting the process that creates toxic clumps of protein in brain cells, scientists hope to help not just Alzheimer's patients, but perhaps also people with Lewy body dementia and Parkinson's.