A redaction is the removal of data from the GDC at a submitter's request.
Because the GDC aims to make data available consistently, redactions are generally rare and performed only in specific instances1. For example, cases must be redacted when the subject withdraws consent, the TSS/BCR subject link is incorrect ("unknown patient identity"), or in the cases of genotype mismatch (i.e. when a sample is shown to be from the wrong cancer, organ, or tissue)1. Redacted cases and their associated files are not displayed in the GDC Data Portal. More generally, a redaction hides the redacted entity and all child entities. Any questions about the redaction status of a case can be directed to GDC User Support2.