Circulating levels of pegvisomant and endogenous growth hormone during prolonged pegvisomant therapy in patients with acromegaly
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Circulating levels of pegvisomant and endogenous growth hormone during prolonged pegvisomant therapy in patients with acromegaly. / Madsen, Michael; Fisker, Sanne; Feldt-Rasmussen, Ulla; Andreassen, Mikkel; Kristensen, Lars Østergaard; Ørskov, Hans; Jørgensen, Jens Otto L.
I: Clinical Endocrinology, Bind 80, Nr. 1, 01.2014, s. 92-100.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Circulating levels of pegvisomant and endogenous growth hormone during prolonged pegvisomant therapy in patients with acromegaly
AU - Madsen, Michael
AU - Fisker, Sanne
AU - Feldt-Rasmussen, Ulla
AU - Andreassen, Mikkel
AU - Kristensen, Lars Østergaard
AU - Ørskov, Hans
AU - Jørgensen, Jens Otto L
N1 - © 2013 John Wiley & Sons Ltd.
PY - 2014/1
Y1 - 2014/1
N2 - OBJECTIVE: To investigate whether pegvisomant treatment in acromegaly induces gradual elevations in endogenous serum growth hormone (GH) levels and whether serum pegvisomant levels predict the therapeutic outcome.PATIENTS AND METHODS: Seventeen patients (6 women), mean age 46·3 years (range: 23·2-76·2), were studied. For each patient, four hospital visits were identified including 'active disease' (no treatment) and last follow-up. At each visit, 12 blood samples were drawn during 3 h including an oral glucose tolerance test (OGTT). Eight patients received a somatostatin analogue in addition to pegvisomant on the last visit.RESULTS: Median (range) pegvisomant doses (mg/day) were 10 (10-10), 15 (10-15) and 15 (10-15) at visits 2, 3 and 4, respectively, and the mean duration of pegvisomant treatment was 17·5 ± 3·2 (SEM) months. Serum IGF-I changed significantly during the treatment period with the highest level at baseline and lowest levels at visits 3 and 4. GH levels increased in a dose-dependent manner during pegvisomant treatment and decreased at visit 4. Changes in IGF-I levels correlated negatively with changes in serum pegvisomant levels between visits. Serum pegvisomant at each visit correlated with baseline growth hormone levels, whereas no associations between serum pegvisomant and either dose, gender, age or body weight were found.CONCLUSIONS: (1) Serum GH levels increased initially, but remained stable during prolonged pegvisomant treatment in patients with acromegaly, (2) serum pegvisomant levels predicted the reduction in serum IGF-I during treatment and (3) the interindividual variation in serum pegvisomant levels seems not predicted by either age, gender or body composition.
AB - OBJECTIVE: To investigate whether pegvisomant treatment in acromegaly induces gradual elevations in endogenous serum growth hormone (GH) levels and whether serum pegvisomant levels predict the therapeutic outcome.PATIENTS AND METHODS: Seventeen patients (6 women), mean age 46·3 years (range: 23·2-76·2), were studied. For each patient, four hospital visits were identified including 'active disease' (no treatment) and last follow-up. At each visit, 12 blood samples were drawn during 3 h including an oral glucose tolerance test (OGTT). Eight patients received a somatostatin analogue in addition to pegvisomant on the last visit.RESULTS: Median (range) pegvisomant doses (mg/day) were 10 (10-10), 15 (10-15) and 15 (10-15) at visits 2, 3 and 4, respectively, and the mean duration of pegvisomant treatment was 17·5 ± 3·2 (SEM) months. Serum IGF-I changed significantly during the treatment period with the highest level at baseline and lowest levels at visits 3 and 4. GH levels increased in a dose-dependent manner during pegvisomant treatment and decreased at visit 4. Changes in IGF-I levels correlated negatively with changes in serum pegvisomant levels between visits. Serum pegvisomant at each visit correlated with baseline growth hormone levels, whereas no associations between serum pegvisomant and either dose, gender, age or body weight were found.CONCLUSIONS: (1) Serum GH levels increased initially, but remained stable during prolonged pegvisomant treatment in patients with acromegaly, (2) serum pegvisomant levels predicted the reduction in serum IGF-I during treatment and (3) the interindividual variation in serum pegvisomant levels seems not predicted by either age, gender or body composition.
KW - Acromegaly
KW - Adult
KW - Aged
KW - Drug Administration Schedule
KW - Female
KW - Growth Hormone
KW - Human Growth Hormone
KW - Humans
KW - Male
KW - Middle Aged
KW - Retrospective Studies
KW - Young Adult
U2 - 10.1111/cen.12239
DO - 10.1111/cen.12239
M3 - Journal article
C2 - 23650996
VL - 80
SP - 92
EP - 100
JO - Clinical Endocrinology
JF - Clinical Endocrinology
SN - 0300-0664
IS - 1
ER -
ID: 138431952