REPORT FROM THE 2009 AAN ANNUAL MEETING – An analysis of patients in the DATATOP (Deprenyl and tocopherol antioxidative therapy of parkinsonism) trial (Shoulson I. Acta Neurol Scand Suppl 1989;126:171-175) has attempted to identify factors predictive of depression onset (Uc et al. AAN 2009; abstract S23.004).