EPCAM/GPA33 protein level ratio in blood (OBA_2054718) can be described as follows. A compound attribute that is the ratio of amount of epithelial cell adhesion molecule (human) in blood to amount of cell surface A33 antigen (human) in blood. Also known as: the ratio of amount of epithelial cell adhesion molecule (human) in blood to amount of cell surface A33 antigen (human) in blood.