A compound attribute that is the ratio of amount of cadherin-3 (human) in blood to amount of tumor necrosis factor receptor superfamily member 21 (human) in blood. The trait is CDH3/TNFRSF21 protein level ratio in blood (Ontology of Biological Attributes id OBA_2054397). Also known as: the ratio of amount of cadherin-3 (human) in blood to amount of tumor necrosis factor receptor superfamily member 21 (human) in blood.