Retired Biological Process Concepts

Retired Biological Process Concepts are no longer active concepts in the NCI Thesaurus (retired). Such concepts should not be used for coding purposes, except to deal with old data, and should be ignored by application software systems. The associated codes and identifiers of these concepts will not be reused. Once a concept has been created and released for use it will never be deleted. However, it may become retired if it is found to be redundant with another concept, found to be meaningless, or for various other reasons. In cases where retired concepts were semantically valid, equivalent concepts remain in the NCI Thesaurus. History table entries show when the concepts were inactivated, and the properties OLD_CHILD, OLD_PARENT, OLD_KIND, OLD_ROLE, OLD_SOURCE_ROLE and OLD_STATE indicate the contents of the concept when it was in active status. (NCI Thesaurus)

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