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Combined therapy of somatostatin analogues and dopamine agonists in the treatment of pituitary tumours

Department of Molecular and Clinical Endocrinology and Oncology, ‘Federico II’ University of Naples, via S. Pansini 5, 80131 Naples, Italy and ¹ Unit of Diabetology and Endocrinology, Hospital of Aosta, Aosta, Italy

(Correspondence should be addressed to A Colao; Email: colao{at}unina.it)

This paper was presented at a symposium held at the Erasmus Medical Center, Rotterdam, The Netherlands, 2005. The symposium was jointly organized by LJ Hofland, Erasmus Medical Center, and A Colao, Federico II University of Naples, Italy. Ipsen partially supported the publication of these proceedings.

Abstract

Pituitary tumours express both somatostatin and dopamine receptors. Medical treatment with somatostatin analogues is a cornerstone of GH- and TSH-secreting tumours, while treatment with dopamine agonists is a cornerstone of prolactin-secreting tumours. Dopamine agonists have also demonstrated some efficacy in patients with GH- and TSH-secreting adenomas. Neither ACTH-secreting nor clinically non-functioning tumours have a well-established medical treatment. Nevertheless, some recent results have indicated a potential usefulness of the dopamine agonist cabergoline in patients with pituitary-dependent Cushing’s disease. Combination treatment with both somatostatin analogues and dopamine agonists has been poorly investigated. Some studies conducted in small series have documented an additive effect of both drugs in patients with GH-secreting adenomas. Of mention is that none of the studies were randomised and cross-sectional so that the results should be confirmed by other well-designed studies. No data are available in other pituitary tumour histotypes. Preliminary observations in patients with clinically non-functioning adenomas are very promising.

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