A compound attribute that is the ratio of amount of mediator of RNA polymerase II transcription subunit 18 (human) in blood to amount of transforming acidic coiled-coil-containing protein 3 (human) in blood. The trait is MED18/TACC3 protein level ratio in blood (OBA_2053795). Also known as: the ratio of amount of mediator of RNA polymerase II transcription subunit 18 (human) in blood to amount of transforming acidic coiled-coil-containing protein 3 (human) in blood.