Best Platforms for Sharing Clinical Trial Data Responsibly and Transparently

Introduction: Why Repository Selection Matters

As open data becomes a regulatory and ethical expectation in clinical research, selecting the right data repository is critical. A good repository ensures data security, metadata integrity, ease of access for researchers, and compliance with global transparency mandates. With numerous platforms available, sponsors and researchers must understand which repositories align with their data type, jurisdiction, and privacy standards.

This tutorial reviews the top global repositories used to share clinical trial data, highlighting features, regulatory alignment, and use cases. The right choice not only fulfills obligations but enhances the visibility, utility, and impact of trial results.

Types of Clinical Trial Repositories

Clinical trial data can be deposited in several types of repositories:

• Regulatory Registries: Required by authorities (e.g., ClinicalTrials.gov, EU CTR)
• Open Data Platforms: Allow public access (e.g., Dryad, Figshare)
• Controlled-Access Repositories: Require request and approval (e.g., Vivli, YODA)
• Sponsor-Owned Portals: Managed by pharmaceutical companies or CROs

Each category serves different access levels and privacy safeguards, and often a combination is used for broad compliance and discoverability.

Repository Comparison Table

1. ClinicalTrials.gov – The Primary US Registry

Operated by the U.S. National Library of Medicine, ClinicalTrials.gov is a mandatory repository for most interventional studies conducted under FDA jurisdiction. It includes trial registration, summary results, and outcome measures.

Key Features:

• Accepts summary results in tabular format
• Structured data entry via PRS (Protocol Registration System)
• Used to assess compliance under FDAAA 801
• Global visibility and indexing

Explore ClinicalTrials.gov

2. Vivli – A Global Controlled-Access Platform

Vivli.org is a nonprofit data sharing platform that hosts individual participant-level data (IPD) and supports cross-sponsor collaboration. It enables researchers to access de-identified datasets following a formal proposal and approval process.

Highlights:

• Secure cloud-based environment for data access
• Used by industry sponsors, academia, and funders
• Supports metadata linkage with DOIs and publications
• Supports compliance with EMA Policy 0070 and ICMJE

Vivli promotes transparency while protecting participant confidentiality through strict governance models.

3. YODA Project – Yale Open Data Access

The YODA Project facilitates access to participant-level clinical trial data, originally launched with Johnson & Johnson trials. Like Vivli, it provides controlled access but with academic stewardship from Yale University.

Benefits:

• Transparent and independent data review committee
• Peer-reviewed request process
• Wide range of therapeutic areas and sponsors
• Ideal for systematic reviews and re-analyses

YODA ensures ethical, scientific, and secure reuse of trial datasets for non-commercial academic purposes.

4. Dryad – An Open Access Research Repository

Dryad is a general-purpose data repository used by many medical and biological journals to host underlying datasets. It supports FAIR (Findable, Accessible, Interoperable, Reusable) principles.

Attributes:

• Open access with DOI assignment
• Simple CSV/Excel upload format
• Supports data citation in journal publications
• Useful for protocol-linked data tables

While not trial-specific, Dryad offers wide reach for published datasets supporting transparency and reproducibility.

5. EU Clinical Trials Register (EUCTR)

Managed by the EMA, the EUCTR provides public access to clinical trials conducted in the EU. It includes trial design, sponsor info, and results summaries, aligned with the EU Clinical Trials Regulation (CTR).

Core Capabilities:

• Automatically populated via national competent authorities
• Open access portal
• Supports results posting and EudraCT ID linkage
• Essential for compliance with EU CTR

While limited in accepting raw datasets, EUCTR plays a critical role in regulatory and public transparency.

Honorable Mentions and Niche Repositories

• ISRCTN Registry – Offers DOI assignment and metadata enhancement
• Zenodo – EU-backed repository for all disciplines, including clinical data
• Figshare – Supports supplemental materials and interactive visualizations
• OpenTrials.net – Curates trial information from multiple sources

Some funders and journals also maintain their own repositories — always check sponsor-specific data sharing policies.

Choosing the Right Repository: Decision Factors

When selecting a repository, consider the following:

• Regulatory obligations – Some registries are legally required (e.g., ClinicalTrials.gov)
• Data type – IPD vs summary data
• Access model – Open vs controlled
• Anonymization requirements – Privacy law compliance
• Discoverability – DOI assignment, indexing, and citation metrics

Multi-platform upload is also common: registration in one platform, datasets in another, and publications linked to both.

Conclusion: Enabling Transparency Through Strategic Repository Use

Repositories are vital infrastructure for global clinical trial transparency. They empower open science, reinforce participant trust, and accelerate therapeutic innovation. By understanding each platform’s strengths, access policies, and submission standards, trial sponsors and investigators can choose the most effective way to disseminate data and meet compliance expectations. Transparency is no longer optional — and these repositories are the gateways to achieving it.