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Targeting either GH or IGF-I during somatostatin analogue treatment in patients with acromegaly: a randomized multicentre study

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CONTEXT: Discordant GH and IGF-I values are frequent in acromegaly. The clinical significance and its dependence on treatment modality and of glucose-suppressed GH (GHnadir) measurements remain uncertain.

OBJECTIVE: To evaluate the effects of targeting either IGF-I or GH during somatostatin analogue (SA) treatment.

PATIENTS AND METHODS: 84 patients with controlled acromegaly after surgery (n = 23) or SA (n = 61) underwent a GH profile including an OGTT, at baseline and after 12 months. SA patients were randomized to monitoring according to either IGF-I (n = 33) or GHnadir (n = 28). SA dose escalation was allowed at baseline and 6 months.

MAIN OUTCOME MEASURES: GHnadir and IGF-I at baseline and 12 months, and disease-specific Quality of Life (QoL).

RESULTS: IGF-I and fasting GH levels were comparable between the surgery and the SA group, whereas GHnadir (µg/L) was lower in the surgery group (GHnadir 0.7 ± 0.1 vs 0.3 ± 0.1, P < 0.01). SA dose increase was performed in 20 patients in the GH group and in 8 patients in the IGF-I group (P = 0.02), which increased the number of concordantly controlled patients (P = 0.01). QoL was only mildly affected at baseline in all groups and did not changed consistently during the study.

CONCLUSION: (1) Discordant values in terms of high GH levels are prevalent in SA patients and more so if applying glucose-suppressed GHnadir; (2) targeting discordant levels of either GH or IGF-I translates into SA dose increase and improved biochemical control; (3) even though QoL was not improved in this study, we suggest biochemical assessment of disease activity to include glucose-suppressed GHnadir also in SA patients.

TidsskriftEuropean Journal of Endocrinology
Udgave nummer1
Sider (fra-til)65-74
StatusUdgivet - jan. 2018

ID: 52398767