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Chromogranin A and chromogranin B are sensitive circulating markers for phaeochromocytoma

Specific assays for measurements of circulating chromogranin (Cg) A, CgB, CgC and pancreastatin (Ps) have recently been developed. The aim of the present study was to investigate the usefulness of these markers in diagnosing and following the effects of treatment of patients with phaeochromocytoma, and to compare the results with those concerning other biochemical markers. CgA was elevated in 19/21 (90%), CgB in 17/21 (81%), Ps in 9/21 (43%) and neuropeptide Y in 9/21 (43%) of the patients. Urinary noradrenaline was increased in 19/21 (90%) and urinary adrenaline in 17/19 (89%) of the patients. All patients had increased levels of either urinary catecholamines or plasma chromogranins. In one patient levels of CgA, CgB and Ps were measured at frequent intervals before, during and after surgery. The CgA level fell to normal shortly after the tumour was removed, whereas the CgB level decreased towards normal over the course of several days. Significant correlation was observed between the contents of CgA and CgB in the tumour tissue and the plasma levels of CgA and CgB respectively. We conclude that CgA and CgB are sensitive circulating markers for phaeochromocytoma and that measurements of both urinary catecholamines and plasma chromogranins improve the diagnostic sensitivity. Furthermore, measurements of CgA may be useful in assessing the radicality of surgery in the early postoperative period.

European Journal of Endocrinology 136 67–73

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