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Comment: Added more information based on my current understanding. Added links.

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The ability to amend a trial depends on multiple factors, as described in the following table:

FactorDescription
Who can amend a trial?Only the trial owner. A trial may have more than one owner. To request ownership of a trial, contact your Site Administrator. (If you are a Site Administrator, refer to Managing Trial Ownership.)
What types of trials can be amended?Only National, Externally Peer-Reviewed, and Institutional trials that have been registered with the CTRP previously. For information, refer to CTRP Trial Categories, Study Sources.
At which trial processing statuses can a trial be amended?Only trials that have reached the Abstraction Verified Response or Abstraction Verified No Response processing status. For information, refer to Trial Processing Statuses.
At which trial statuses can a trial be amended?Only trials that have reached the In Review or Approved trial status. For information, refer to Trial Status Values in the CTRP and ClinicalTrials.gov.

The CTRO reviews and abstracts amended trial data just as it does with original submissions.

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