Avaliamos as concentrações de GH, IGF-1 e IGFBP-3 em 10 pacientes com acromegalia em atividade, antes e após tratamento com octreotida subcutânea (OCT-sc) e LAR (OCT-LAR). Verificamos o valor preditivo dos testes agudo e de curto prazo (após 21 dias) na resposta do GH e IGF-1. As avaliações de médio prazo foram realizadas após 6 meses de tratamento com cada formulação. Os valores de GH (µg/l; IFMA), nadir de GH no oGTT e IGF-1 (µg/l; IRMA) pré-tratamento foram 13,9±6,3; 11,4±6,3; 717±107, respectivamente. Os tratamentos de 21 dias com OCT-sc ou OCT-LAR reduziram os níveis de GH (2,9±1,1 e 4,4±1,2) e IGF-1 (491±80 e 512±80). Redução após 6 meses de tratamento foi similar com as duas formulações: GH basal (2,8±0,9 e 1,9±0,5), nadir GH-GTT (1,6±0,4 e 1,6±0,5) e IGF-1 (583±107 e 515±83). A IGFBP-3 não foi bom parâmetro para avaliação destes pacientes. O teste agudo não foi indicador da ocorrência de efeitos colaterais. Os testes, agudo e de curto prazo, foram capazes de predizer a resposta do GH ao tratamento crônico com a OCT-sc e OCT-LAR.
We evaluated GH, IGF-1 and IGFBP-3 concentrations in ten acromegalic patients before and after treatment with subcutaneous octreotide (OCT-sc) and long-acting octreotide (OCT-LAR). We also evaluated the acute and short-period treatment (post 21 days) with octreotide as an index to test tolerance and responsiveness to both formulations. Patients were also evaluated after 6 months of treatment with each drug. Pre-treatment fasting GH (µg/l; IFMA), GH nadir during oGTT and IGF-1 (µg/l; IRMA) levels were 13.9±6.3; 11.4±6.3; 717±107, respectively. Fasting GH and IGF-1 were reduced after short treatment with OCT-sc or OCT-LAR (2.9±1.1 and 4.4±1.2; 491±80 and 512±80). All parameters were also reduced after a six-month period with OCT-sc or OCT-LAR (2.8±0.9 and 1.9±0.5; 1.6±0.4 and 1.6±0.5; 583±107 and 515±83), respectively. The efficacy of the two drugs was similar. IGFBP-3 was not a good parameter during follow-up of these patients. The acute test with OCT-sc was not a valuable index to predict tolerance, however, as well as the short-period test, it could predict the long-term GH responsiveness to OCT.