C C173072 CTDC Property Terminology C164813 Genetic Variation Identifier A unique identifier maintained by an authoritative database that represents a genetic variation. variant_id external variant id || external_variant_id || variant id C C173073 CTDC Value Terminology C35571 Progressive Disease A clinical, pathologic, and/or molecular finding indicating that the course of a disease is worsening in terms of extent or severity. Progressive disease