Hyperprealbuminemia, euthyroid hyperthyroxinemia, Zollinger-Ellison-like syndrome and hypercorticism in a pancreatic endocrine tumour

P Maye, A Bisetti, A Burger, R Docter, R Gaillard, M Griessen, M F Pelte
Acta Endocrinologica 1989, 120 (1): 87-91
Prealbumin, one of the main thyroxine transport proteins, has recently been shown to be a valuable immunohistochemical marker of neuroendocrine tumours. We report the case of a multisecretory pancreatic endocrine tumour whose prealbumin secretion was so high that it produced a peak on routine serum protein electrophoresis and induced a euthyroid hyperthyroxinemia. The maximal binding capacity of prealbumin for thyroxine was indeed markedly increased, whereas its affinity for this hormone was normal. The tumour was associated with gastric hyperacidity and hypergastrinemia thereby evoking a Zollinger-Ellison syndrome. The secretin stimulation test and gastrin tumoural immunohistochemistry were, however, negative. We suggest that the concomitant tumoural production of gastrin-releasing peptide was responsible for the gastric hyperacidity and hypergastrinemia. This hormone probably also accounted for a moderate hypercorticism.

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