A compound attribute that is the ratio of amount of epidermal growth factor receptor (human) in blood to amount of prolyl endopeptidase FAP (human) in blood. The trait is EGFR/FAP protein level ratio in blood (Ontology of Biological Attributes id OBA_2055607). Also known as: the ratio of amount of epidermal growth factor receptor (human) in blood to amount of prolyl endopeptidase FAP (human) in blood.