What is it? Why is it important?

Database lock is the action taken to ensure that no further changes to study data are possible.

Two main database locks exist:

  • Interim lock performed during study conduct due to:
    • Study safety and/or efficacy concerns
    • Additional data cleaning requirements

Database locks and evaluations during study conduct must always be based on specifications and rationales given in the study protocol (e.g. safety / DSMB, efficacy concerns).

  • Final lock performed after:
    • All study data (variables) has been collected and entered in the database (eCRF)
    • Data cleaning with the aim to resolve missing or incorrect data is complete
    • All pending data queries are resolved (e.g. correspondence between monitor and study staff regarding data inconsistencies)

More

Interim database locks (before all data has been collected) can be planned in order to evaluate whether to continue, adapt or terminate a study. This can be due to:

  • Safety concerns (e.g. a potential high frequency of adverse events during study treatment)
  • Efficacy concerns (e.g. treatment effect compared to placebo is highly superior or has no added benefit)

Note, data analysis not based on specifications in the study protocol carries the risk of corrupting the study, as the researcher is no longer an independent bystander of the study but become biased as to study outcome.

Database locks can also be planned during long term studies, with the aim to minimise data cleaning workload once the study is terminated.

 

What do I need to do?

Write an SOP that describes:

  • Grounds for database lock (e.g. based on study protocol specifications)
  • Frequency and timing of lock(s) (e.g. after inclusion of 3 participants, 1st participant has completed the intended study treatment)
  • SP-INV and Site-INV responsibilities (e.g. eCRF sign-off confirming that study data is complete, correct and validated)
  • Access management (e.g. staff logins are removed to prevent further changes to the database)
  • How to document the lock (e.g. time and date of lock including implemented version of the locked database)
  • Type of statistical analysis required including any implication with respect to deviations (e.g. the study may have to be adapted or discontinued due to safety or efficacy concerns)

For more information refer to Monitoring in this Trial Guide.

More

Upon locking the database, it is important to document the exact date and version of the locked database. This confirms that:

  • The current and correct study database version was used by the statistician during data analysis
  • Data analysis was done after the database was locked

To ensure data quality and facilitate database lock, plan ahead and ensure that:

  • Data entries are performed on an ongoing basis, while data is still “fresh”. Hindsight backlog of large volumes of data carries increased risks of data errors and data quality concerns
  • SP-INV and Site-INVs sign-off CRFs on an ongoing basis. A task that should not be postponed to the very end. By signing-off the CRF, it is confirmed that all required data (variables) has been entered in the CRF and has been monitored to be correct
  • External data providers (e.g. laboratories) are informed of upcoming database locks to ensure that all available data (variables) is collected and integrated into the study database
  • Data monitoring visits are planned in good time before any planned database locks

Where can I get help?

Your local CTU↧ can support you with experienced staff regarding this topic

References

ICH GCP E6(R2) – see in particular guidelines

  • 5.5. Trial Management, data handling, and record-keeping
Abbreviations
  • CRF – Case Report Form
  • CTU – Clinical Trials Unit
  • DSMB – Data Safety Monitoring Board
  • eCRF – electronic Case Report Form
  • Site-INV – Site-Investigator
  • SOP – Standard Operating
  • SP-INV – Sponsor-Investigator
Development ↦ Data Handling ↦ Database Lock ↦ Procedures
Study
Basic

Provides some background knowledge and basic definitions

Basic Protocol
Basic Management
  1. Study Management
    1. Definition
Basic Ethics and Laws
  1. Principles of Ethics Research
    1. Declaration of Helsinki
    2. Declaration of Taipei
  2. Authorities
    1. Ethics Committee
    2. Swissmedic
    3. Federal Office of Public Health
    4. International
  3. Swiss Law
    1. Human Research Act
    2. Transplantation Act
    3. Stem Cell Research Act
    4. Data Protection Act
  4. Clinical Trials Ordinance
    1. Aim
    2. Medicinal Products
    3. In Vitro Diagnostic Medical Device
    4. Standardized Transplant Products
    5. Gene Therapy, GMO, Pathogenic
    6. Transplantation
    7. Other Clinical Studies
    8. Ionising Radiation
  5. Human Research Ordinance
    1. Aim
    2. Projects with Data and Biological Material
    3. Further use of Data and Biological Material
    4. Further use and Informed Consent
    5. Deceased Persons Embryos and Foetuses
  6. Medical Device Ordinance
    1. Aim
    2. In Clinical Studies
    3. Notified Bodies
  7. Organisation Ordinance
    1. Aim
  8. Portals
    1. Human Research Portal
    2. Ethics Portal BASEC
    3. Swissmedic Portal
  9. Guidelines
    1. Good Clinical Practice
    2. ISO 14155
    3. ISO 20916
Basic Documents
  1. Document Management
    1. Purpose
    2. In Studies
    3. Document Identification
    4. Document Filing
  2. Standard Operating Procedures
    1. Purpose
  3. Working Instructions
    1. Purpose
  4. Logs
    1. Purpose
  5. Essential Documents
    1. Requirement
  6. Certified Copies
    1. Procedures
  7. Staff Documents
    1. Qualifications
    2. Training
Basic Safety
  1. Safety Laws
    1. Aim
  2. Safety Terminology
    1. Overview
  3. Safety Data
    1. Product Development
    2. Pre-Clinial Studies
    3. In Clinical Studies
  4. Safety Information
    1. Investigator Brochure
  5. Safety Vigilance
    1. Pharmacovigilance
    2. Materiovigilance
Basic Data Handling
  1. Data Management in Studies
    1. Aim
  2. Study Database
    1. Clinical Data Management System
    2. Study Data
    3. Raw Data
    4. Metadata
  3. Regulatory Requirements
    1. Swiss Law
    2. General Data Protection Regulation
Basic Statistics
Basic Quality and Risk
  1. Risk Management Definitions
    1. Risk-Based Approach
    2. Risk Identification
    3. Risk Evaluation and Prioritisation
    4. Risk Evaluation Matrix
    5. Risk Control Measures
  2. Quality Management System (QMS)
    1. Risk Based
  3. Risk-Based QMS Responsibilities
    1. Sponsor-Investigator
    2. Site-Investigator
    3. Study Staff
Basic Monitoring
Basic Drug or Device
Basic Biobanking
Concept

Starts with a study idea

Ends after having assessed and evaluated study feasibility

Concept Protocol
Concept Management
  1. Study Idea
    1. Implementation
    2. Design
  2. Resources
    1. Study Staff
    2. Infrastructure
    3. Storage
    4. Partners
    5. Budget
Concept Ethics and Laws
  1. Study Categorisation
    1. Procedures
    2. Risk Categories
  2. Regulatory Advice
    1. Scientific Advice
    2. Pre-Submission
  3. Regulatory Advice Meeting
    1. Ethics Clarification
  4. Research Aim
    1. Advancing Science
    2. Marketing Products
  5. Research Integrity
    1. Principles
    2. Conflict of Interest
    3. Participant Protection
  6. Study Planning
    1. Ethics Requirements
    2. Laws and Guidelines
    3. Institution Requirements
  7. Study Feasibility
    1. Ethics and Laws
Concept Documents
  1. Required Documents
    1. Protocol and Synopsis
    2. Feasibility
    3. Investigator's Brochure
Concept Safety
  1. Safety in Studies
    1. Risk-Benefit Ratio
    2. Participant Risk-Benefit
Concept Data Handling
  1. Stakeholders
    1. Sponsor-Investigator
    2. Data Manager
    3. Statistician
    4. Site-Investigator
    5. Monitor
  2. Clinical Data Mgmt. System
    1. Selection
  3. Server
    1. Data Storage
    2. Back-Up and Recovery
Concept Statistics
Concept Quality and Risk
  1. Study Feasibility
    1. Aim
    2. Feasibility Questionnaire
    3. Risk Assessment Form
    4. Study Team
Concept Monitoring
  1. Monitoring
    1. Aim
    2. Study Requirement
    3. Site Feasibility
Concept Drug or Device
Concept Biobanking
Development

Starts with confidence that the study is feasible

Ends after having received ethics and regulatory approval

Development Protocol
Development Management
  1. Responsibilities
    1. Sponsor-Investigator
    2. Site-Investigator
    3. Staff Qualification and Training
    4. Good Clinical Practice Training
  2. Quality Mgmt. System
    1. Implementation
    2. Interim Analysis
  3. Study Management
    1. Oversight
    2. Tracking
    3. Infratructure and Maintenance
    4. Multi-centre Studies
    5. Insurance
    6. Outsourced Services
    7. Contract
    8. Budget
  4. Study Documents
    1. Protocol
    2. Participant Information Sheet
    3. Informed Consent Form
    4. Exemption from written Consent
    5. Informed Consent Process
    6. General Consent
    7. Essential Documents
    8. Source Data
  5. Study Approval
    1. Ethics Committee
    2. Swissmedic
    3. Fed. Off. Public Health
  6. Biobanking
    1. Management
    2. Emergency Plan
Development Ethics and Laws
  1. Ethics Application
    1. Submission
    2. Application Dossier
    3. Approva
  2. Swissmedic Application
    1. Application Dossier
    2. Early Clarification Meeting
    3. Late Clarification Meeting
    4. Approval Medicinal Products
    5. Approval Medical Device
  3. Federal Office of Public Health
    1. Submission
    2. Approval
  4. Liability
    1. Insurance
    2. Good Clinical Practice
Development Documents
  1. Required Documents
    1. Study Protocol
    2. Participant Information
    3. Insurance and Contract
    4. Study Documents
    5. Document Submission
Development Safety
  1. Safety Documentation
    1. The Protocol
    2. Study Documents
    3. Data Protection
Development Data Handling
  1. Study Database Set-Up
    1. Variables
    2. Variable Specification
    3. Case Report Form
    4. Automated Data Processing
    5. Data Confidentiality
    6. Data Coding and Anonymisation
  2. Data Quality
    1. Requirement
    2. Quality Management
    3. Data Mgmt. Plan
  3. Database Lock
    1. Procedures
Development Statistics
Development Quality and Risk
  1. Study Risk Management
    1. Risk Identification
    2. Risk Evaluation and Prioritisation
    3. Risk Control Measures
    4. Process Verification and Training
  2. Quality Assurance
    1. Aim
    2. Quality Documents
    3. Audit
  3. Quality Control
    1. Aim
    2. Monitoring
    3. Non-Compliance
  4. Risk Communication
    1. Strategy
Development Monitoring
  1. Montoring Strategy
    1. Aim
    2. Risk-Based Monitoring
    3. On-Site Monitoring
    4. Central Monitoring
    5. Monitoring Plan
Development Drug or Device
Development Biobanking
Set-Up

Starts with ethics and regulatory approval

Ends after successful study initiation

Set-Up Protocol
Set-Up Management
  1. Registration
    1. Research Transparency
  2. Study Training
    1. Staff
  3. Document Management
    1. Requirements
  4. Investigational Product
    1. In Studies
  5. Laboratory
    1. Aim
  6. Study Ready for Conduct
    1. Requirements
  7. Study Monitoring
    1. Site Initiation Visit
Set-Up Ethics and Laws
  1. Study Set-Up
    1. Requirements
Set-Up Documents
  1. Required Documents
    1. Study Initiation
    2. Master and Site File
Set-Up Safety
  1. Safety Management
    1. Safety Management Plan
    2. Emergency Unblinding
  2. Data Safety Monitoring Board
    1. Aim
Set-Up Data Handling
  1. Database
    1. Development
    2. Access Rights
    3. Training
Set-Up Statistics
Set-Up Quality and Risk
Set-Up Monitoring
  1. Site Initation Visit
    1. Aim
    2. Prerequisite
    3. Preparation
    4. Conduct
    5. Report
Set-Up Drug or Device
Set-Up Biobanking
Conduct

Starts with participant recruitment

Ends after the last participant has completed the last study visit

Conduct Protocol
Conduct Management
  1. Participant Recruitment
    1. Pre-Screening
    2. Screening and Consent
    3. Documentation of Recruitment
  2. Amendment
    1. Protocol
    2. Patient Information Sheet
  3. Safety
    1. Reporting
    2. Annual Safety Reporting
    3. Interim Analysis
  4. Responsibility and Oversight
    1. Site-Investigator
    2. Routine Monitoring
    3. Risk Review
    4. Drug Accountability
    5. Compliance
    6. Newsletter
    7. Essential Documents
    8. Budget
Conduct Ethics and Laws
  1. Study Conduct
    1. Ongoing Tasks
    2. Data Protection
  2. Participant Protection
    1. Requirements
    2. Consent of Vulnerable Participants
  3. Amendment
    1. Type
    2. Submission
    3. Approval
  4. Safety
    1. Requirements
  5. Inspections and Audits
    1. Inspection Conduct
    2. Audit Conduct
    3. Audit Certificate
  6. Premature Study Termination
    1. Rationale
    2. ReportingTimelines
Conduct Documents
  1. Required Documents
    1. Study Documentation
    2. Patient File
    3. Source Data
    4. Amendment
Conduct Safety
  1. Safety Risk Review
    1. Aim
  2. Safety Assessment
    1. Medicinal Product
    2. Medical Device
    3. Other Clinical Trials
    4. Research Projects
  3. Safety Reporting
    1. Procedures
    2. Responsibilities
  4. Medicinal Product Safety Reporting
    1. Adverse Event
    2. Serious Adverse Event
    3. (Serious) Adverse Drug Reaction
    4. Suspected Unexpected Serious Adverse Reaction
    5. Advanced Therapies
  5. Medical Device Safety Reporting
    1. Adverse Event / Adverse Device Effect
    2. Serious Adverse Event and Device Effect
    3. Device Deficiency
  6. Research Project Safety Reporting
    1. Serious Events
  7. Safety and Protective Measures
    1. Procedures
  8. Annual Safety Report
    1. Procedures
Conduct Data Handling
  1. Data Entry
    1. Requirement
    2. Collection
  2. Data Quality
    1. Responsibility
    2. Training
  3. Data Handling
    1. Data Import
    2. Interim Lock
    3. Intermediate Data Eport
    4. Amendment
Conduct Statistics
Conduct Quality and Risk
  1. Risk Review
    1. Re-Evaluation
    2. Risk Documentation
  2. Deviation Documentation
    1. Note to File
  3. Regulatory Inspections
    1. Conduct
    2. Findings
    3. Corrective and Preventive Actions
Conduct Monitoring
  1. Routine Monitoring Visit
    1. Preparation
    2. Conduct
    3. Findings
    4. Report
    5. Follow-Up Letter
Conduct Drug or Device
Conduct Biobanking
Completion

Starts with last study visit completed

Ends after study publication and archiving

Completion Protocol
Completion Management
  1. Study Closure
    1. Close-Out Visit
    2. Database Lock
    3. Notification of Closure
    4. Lessons Learned
  2. Clinical Study Report
    1. Regulatory Requirements
  3. Publishing
    1. Study Registries
    2. Scientific Publications
  4. Archiving
    1. Storage
Completion Ethics and Laws
  1. End of Study Notification
    1. ReportingTimelines
    2. Liability Coverage
    3. Registry Update
  2. Clinical Study Report
    1. Procedures
  3. Publications
    1. Responsibilities
  4. Inspections and Audits
    1. Procedures
  5. Archiving
    1. Requirements
    2. Duration
Completion Documents
  1. Required Documents
    1. Study Closure
    2. Doument Archiving
    3. Document Destruction
Completion Safety
  1. Clinical Study Report
    1. Procedures
Completion Data Handling
  1. Final Database Lock
    1. Procedures
  2. Data Export
    1. Data Formatting and Tranfer
    2. Data Transfer Agreement
  3. Clinical Study Report
    1. Requirement
  4. Archiving
    1. Requirement
Completion Statistics
Completion Quality and Risk
  1. Clinical Study Report
    1. Risk Reporting
    2. Lessons Learned
  2. Archiving
    1. Study Records
Completion Monitoring
  1. Close-Out Visit
    1. Preparation
    2. Conduct
    3. Report
    4. Follow-Up Letter
    5. Archiving
Completion Drug or Device
Completion Biobanking
Current Path (click to copy): Development ↦ Data Handling ↦ Database Lock ↦ Procedures

Please note: the Easy-GCS tool is currently under construction.