We describe a 50-year-old man with a diagnosis of gastric carcinoma made on gastroscopy after X-rays of the thoracolumbar spine had revealed multiple lytic metastases. A bone marrow aspirate showed adenocarcinoma cells. Polyacrylamide gel electrophoresis incorporating wheat germ lectin was used to separate the serum alkaline phosphatase isoenzymes. Isoenzyme separation showed a markedly increased amount of bone isoenzyme, a normal amount of liver isoenzyme and a considerable amount of an intestinal-like isoenzyme running cathodic to the bone isoenzyme. There was also some immunoglobulin-complexed alkaline phosphatase, which, when digested, showed more of the intestinal-like isoenzyme. This was a variant alkaline phosphatase isoenzyme found in a patient with a gastric carcinoma with a super bone scan. There have been two previous reports of patients with a variant alkaline phosphatase isoenzyme and a super bone-scan.
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