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Finding Datasets for Secondary Analysis

Lists and Consortia
ClinicalStudyDataRequest is a consortium of clinical study data providers that facilitate access to patient-level data from clinical studies. Participating study sponsors include Astellas, Bayer, Boehringer Ingelheim, Daiichi Sankyo, Eisai, GSK, Lilly, Novartis, Roche, Sanofi, Takeda, UCB, and ViiV Healthcare.
Health Data Repositories
The Health Data Repositories, from Scientific Data (Nature), was created to help authors share their research data, but it can also be used to find data.
Project Data Sphere
Project Data Sphere is a free digital library-laboratory that provides one place where the research community can broadly share, integrate, and analyze historical, patient-level data from academic and industry Phase III cancer clinical trials.
Supporting Open Access Research (SOAR)
SOAR is a collaboration among members of the Duke Clinical Research Institute, academia, and private industry to open clinical research data for the benefit of the broader research community.
Virtual Trials Archives

Virtual Trials Archives is a collaboration of three clinical trial archives:

Vivli is an independent general access data repository and search engine through which individual participant-level data and metadata from clinical trials conducted by researchers in academic, industry, foundation, and non-profit entities can be identified, hosted, shared, and analyzed. Note: Johns Hopkins University is a member institute.
Yale Open Data Access Project (YODA)
The YODA Project is a Yale University project to promote open data in clinical research, in collaboration with Johnson & Johnson, Medtronic, Inc., Queen Mary University of London, and SI-BONE.