Abstract
Pancreatic isoamylases were determined in serum and in duodenal aspirate in 7 patients with pancreatic carcinoma and in 13 patients with chronic relapsing pancreatitis. The serum activities were abnormally low in 3 cases with cancer and in 7 cases with pancreatitis. In 2 cases with normal pancreatic isoamylase activities in serum, pancreatic disease was reflected by an abnormal isoamylase pattern. Thus the serum amylase determination was abnormal in 12 of the 20 patients.