The aim of this work was to assess the use of a sustained-release formulation of somatuline, a long-acting analogue of somatostatin, in the treatment of acromegaly. Fifteen patients with active acromegaly, as defined by random growth hormone (GH) levels greater than 10 mU/l, which fail to be suppressed to less than 5 mU/l following an oral glucose load, were studied. Somatuline was administered as an intramuscular injection in two regimens: eight patients were given a single injection of the sustained-release formulation and blood samples taken over the next month for the measurement of both basal levels of GH and the GH response to thyrotrophin-releasing hormone; and eight patients were given injections of the sustained-release formulation at 2-week intervals over a 6-month period and basal plasma GH levels and the GH response to both an oral glucose load and to thyrotrophin-releasing hormone was assessed. Following a single intramuscular dose of the sustained-release preparation, random GH levels were reduced to below 10 mU/l in five patients and by greater than 50% of basal levels in the remainder. The insulin-like growth factor I (IGF-I) levels fell to within the normal range in three patients. In the long-term efficacy study. GH levels were reduced to < 10 mU/l in 7/8 patients. The IGF-I levels were normalized in four patients. Five of the eight patients experienced diarrhoea, two of mild and three of moderate severity; none of the patients withdrew from the study.(ABSTRACT TRUNCATED AT 250 WORDS)
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