A placental type of membrane-bound arylamidase in serum and ascites from a patient with renal cell carcinoma.

A placental type of membrane-bound arylamidase was detected in serum and ascites from a patient with renal cell carcinoma by isoelectric focusing. The enzyme had the same molecular weight, electrophoretic mobility on polyacrylamide gel, isoelectric point and KM value as placental membrane-bound arylamidase. The new type of membrane-bound arylamidase was named Shiba-isoenzyme after the patient's name.