Case study focused on quest for potential Parkinson’s biomarker highlights opportunities and challenges in site selection. A case study focused on the quest for a potential Parkinson’s biomarker highlights the opportunities and challenges in site selection The Michael J. Fox Foundation for Parkinson’s Research (MJFF) aims to speed clinical research by removing obstacles that stand in the way of drug development. In pursuit of this mission, the Foundation gathers insights from a wide range of stakeholders and uses these perspectives to enhance clinical trial processes from start to finish. In Applied Clinical Trials' Eye on Patient Advocacy series, we will share best practices and lessons learned from the field of Parkinson’s research that can be applied to clinical trials across disease states. In our sixth column in this series, we explore the importance of site selection for study success.