Abstract
Purpose
Pegvisomant (PEGV) treatment in acromegaly patients resistant to somatostatin analogues is less effective in the real life than in clinical trials. This is a multicenter, observational, retrospective, longitudinal study. The aim was to detect characteristics which improve long-term PEGV effectiveness.
Methods
87 acromegalic patients treated with PEGV have been enrolled in seven referral Italian centres. PEGV was administered for up to 4 years, at doses up titrated until IGF-1 normalization or to ≥ 30 mg/day. The rate of patients who reached IGF-1 normalization at last visit has been calculated.
Results
IGF-1 was normalized in 75.9% of patients after 1 year and in 89.6% at last visit. Disease control was associated with lower baseline GH, IGF-1 and IGF-1 xULN and was more frequent when baseline IGF-1 was < 2.7 × ULN (p < 0.02). PEGV dose was dependent on baseline IGF-1 > 2.7 × ULN (p < 0.05) and doses > 1.0 mg/BMI/day were administered more frequently when baseline IGF-1 was > 2.0 × ULN (p = 0.03). PEGV resistance was associated with higher BMI (p = 0.006) and was more frequent when BMI was > 30 kg/m2 (p = 0.07). There were no significant differences between patients treated with monotherapy or combined treatment. IGF-1 normalization, PEGV dose and rate of associated treatment were similar between males and females. PEGV effectiveness was independent from previous management. Diabetic patients needed higher doses of PEGV than non-diabetic ones.
Conclusions
PEGV effectiveness improves when up titration is appropriate. Higher PEGV doses at start and a more rapid up-titration are necessary in patients with obesity and/or IGF-1 > 2.7 × ULN.
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SP, AA, MRA, GA, AB, MCZ, LDM, EG, FM, CM and LT nothing to disclosure. SG, PM consultants for Pfizer. AG consultant for IPSEN, Novartis and Pfizer. SC consultant for Pfizer, Novartis and Italfarmaco, MR consultant for Italfarmaco.
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Ragonese, M., Grottoli, S., Maffei, P. et al. How to improve effectiveness of pegvisomant treatment in acromegalic patients. J Endocrinol Invest 41, 575–581 (2018). https://doi.org/10.1007/s40618-017-0773-0
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DOI: https://doi.org/10.1007/s40618-017-0773-0