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NCI requests the verification of all trial data in CTRP at least every 6 months. The Data Verification due date is determined based on the following:

• Date the last data abstraction Data Abstraction was verified (both new registration and amendment submissions) in CTRP.
• Date the last Update was submitted in CTRP.
• Date the last Data Verification was performed in CTRP

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Each time a trial is verified, the CTRP Registration application records the Date, Verification Method and Verified By. This is true for original as well as updated trials. The Trial Data Verifications history can be found on the Trial Details and Update/Verify Trial Data pages.

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For additional instructions, refer to the following pages:

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