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  • Author: A J Van der Lely x
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J Feenstra, M O van Aken, W W de Herder, R A Feelders and A J van der Lely

We report on a patient with acromegaly who developed severe drug-induced hepatitis during combined treatment with the long-acting somatostatin-analog octreotide and the GH receptor antagonist pegvisomant. The hepatic enzyme disturbances normalized after discontinuation of pegvisomant. After rechallenge with monotherapy pegvisomant, however, the hepatic enzyme disturbances reappeared within a few weeks, indicating that most likely pegvisomant alone and not the long-acting somatostatin analog or the combination of these two drugs was responsible for this case of drug-induced hepatitis. Clinicians should be aware of this potential severe adverse drug reaction and therefore frequent control of hepatic enzymes is mandatory during treatment with pegvisomant.

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Annewieke van den Beld, Olga Carlson, Maire E Doyle, Dimitris Rizopoulos, Luigi Ferrucci, A J Van der Lely and Josephine Egan

Objective: Insulin-like growth factor binding protein-2 (IGFBP-2) concentrations are low in subjects with metabolic syndrome and type 2 diabetes. Intriguingly, recent studies have demonstrated an association between high IGFBP-2 concentrations and increased mortality in populations with certain types of cancer, but also in relatively healthy populations. We evaluated the role of IGFBP-2 in relation to BMI and mortality.

Design and Participants: BMI, insulin-sensitivity, IGF-I and IGFBP-2 were assessed repeatedly in 539 participants of the Baltimore Longitudinal Study of Aging around the age of 55, 65 and 75.

Results: IGFBP-2 concentrations positively correlated with insulin-sensitivity and inversely with BMI, both at baseline and follow-up. Independent of IGF-I, sex, BMI and insulin-sensitivity, circulating IGFBP-2 levels positively correlated with age (P<0.001). Changes over time in BMI were associated with an inverse correlation in IGFBP-2 concentrations. Furthermore, we found indications of a relationship between low baseline IGFBP-2 levels and mortality. Remarkably, after adjustment for insulin-sensitivity, the opposite association was found, as a unit increase of log(IGFBP2) was associated with an increase in the log hazard by 1.43(95%CI 0.3;2.6). This accounted for both baseline as well as serial measurements of IGFBP2 measurements. Finally, in this longitudinal study we found that IGF-I concentrations increased with age (0.82±0.2(ug/L)/yr,P<0.001).

Conclusion: This is the first study investigating the relationship between IGFBP-2 levels and age in a longitudinal setting. Serum IGFBP-2 levels increase with age after the age of fifty and evolve in parallel with insulin sensitivity. IGFBP-2 may therefore be a potential marker for insulin sensitivity. We further show that IGFBP-2 levels can predict mortality in this aging population. However, its predictive value for mortality can only be interpreted in relation to insulin sensitivity. After adjustment for insulin sensitivity, high IGFBP-2 levels are predictive of an increased mortality.

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Christa C van Bunderen, Carline J van den Dries, Martijn W Heymans, Anton A M Franken, Hans P F Koppeschaar, Aart J van der Lely and Madeleine L Drent

Objective

Isolated GH deficiency (IGHD) could provide a model to investigate the influence of GH deficiency per se and the effect of GH replacement therapy without the influence from other pituitary hormone deficiencies or their treatment. The aim of this study is to address the questions about differences between IGHD and multiple pituitary hormone deficiencies (MPHDs) in clinical presentation and in responsiveness to GH treatment.

Design

A nationwide surveillance study was carried out to describe the difference in the clinical presentation and responsiveness to GH treatment of patients with IGHD and MPHDs.

Methods

The Dutch National Registry of GH Treatment in Adults was founded in 1998 to gain more insight into long-term efficacy and safety of GH therapy. Out of 2891 enrolled patients, 266 patients with IGHD at the start of GH treatment were identified and compared with 310 patients with MPHDs. Cardiovascular indices will be investigated at baseline and during long-term follow-up, including body composition, lipid profile, glucose metabolism, blood pressure, and morbidity.

Results

Patients with IGHD and MPHDs were demonstrated to be different entities at clinical presentation. Metabolically, patients with MPHDs had a larger waist circumference, lower HDL cholesterol level, and higher triglyceride level. The effect of GH treatment was comparable between patient groups. GH seems to protect against rising lipid levels and blood pressure, even after excluding patients using corresponding concomitant medication. The risk for cardiovascular disease or diabetes mellitus during follow-up was not different between patients with IGHD and MPHDs.

Conclusions

Patients with IGHD had a less impaired metabolic profile than patients with MPHDs at baseline. Influence of other pituitary hormone replacement therapies on the effect of GH treatment is not demonstrated.

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Aimee J Varewijck, Steven W J Lamberts, A J van der Lely, Sebastian J C M M Neggers, Leo J Hofland and Joseph A M J L Janssen

Context

Previously we demonstrated that IGF1 receptor stimulating activity (IGF1RSA) offers advantages in diagnostic evaluation of adult GH deficiency (GHD). It is unknown whether IGF1RSA can be used to monitor GH therapy.

Objective

To investigate the value of circulating IGF1RSA for monitoring GH therapy.

Design/methods

106 patients (54 m; 52 f) diagnosed with GHD were included; 22 were GH-naïve, 84 were already on GH treatment and discontinued therapy 4 weeks before baseline values were established. IGF1RSA was determined by the IGF1R kinase receptor activating assay, total IGF1 by immunoassay (Immulite). GH doses were titrated to achieve total IGF1 levels within the normal range.

Results

After 12 months, total IGF1 and IGF1RSA increased significantly (total IGF1 from 8.1 (95% CI 7.3–8.9) to 14.9 (95% CI 13.5–16.4) nmol/l and IGF1RSA from 115 (95% CI 104–127) to 181 (95% CI 162–202) pmol/l). After 12 months, total IGF1 normalized in 81% of patients, IGF1RSA in 51% and remained below normal in more than 40% of patients in whom total IGF1 had normalized.

Conclusions

During 12 months of GH treatment, changes in IGF1RSA did not parallel changes in total IGF1. Despite normalization of total IGF1, IGF1RSA remained subnormal in a considerable proportion of patients. At present our results have no short-term consequences for GH therapy of GHD patients. However, based on our findings we propose future studies to examine whether titrating GH dose against IGF1RSA results in a better clinical outcome than titrating against total IGF1.

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Christa C van Bunderen, Nadège C van Varsseveld, Martijn W Heymans, Anton A M Franken, Hans P F Koppeschaar, Aart J van der Lely and Madeleine L Drent

Objective

The effect of GH deficiency (GHD) on the metabolic profile of acromegaly patients is unclear in patients previously treated for acromegaly, as are the efficacy and safety of GH treatment in this particular group. The aim of the study is to describe the characteristics of patients with severe GHD who were previously treated for acromegaly, and to investigate the effects of long-term GH treatment on cardiovascular risk factors and morbidity, compared with patients who were treated for a nonfunctioning pituitary adenoma (NFPA).

Design

A nationwide surveillance study.

Methods

Sixty-five patients from the Dutch National Registry of Growth Hormone Treatment in Adults with previous acromegaly were compared with 778 patients with previous NFPA. Cardiovascular indices, including body composition, lipid profile, glucose metabolism, blood pressure, and morbidity were investigated.

Results

GHD patients with previous acromegaly had an unfavorable metabolic profile comparable with or more than GHD patients with previous NFPA. GH treatment led to improvement of the lipid profile in both groups, also after excluding patients using lipid-lowering medication. In patients with previous acromegaly, HbA1c levels increased more than in patients with previous NFPA (estimate 0.03, 95% CI 0.002–0.06, P=0.04). The risk for developing cardiovascular diseases was not different between the groups.

Conclusions

The patients with GHD after previous acromegaly have an unfavorable metabolic profile comparable with patients with GHD after previous NFPA. In both groups, the lipid profile improves during GH treatment. Changes in glucose metabolism should be monitored closely. GH treatment in patients with GHD previously treated for acromegaly had no deleterious effect on cardiovascular morbidity.

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Wouter W de Herder, Ambroos E M Reijs, Richard A Feelders, Maarten O van Aken, Eric P Krenning, Aart-Jan van der Lely and Dik J Kwekkeboom

Dopamine D2 receptor scintigraphy of pituitary adenomas is feasible by single-photon emission computed tomography using 123I-S-(−)-N-[(1-ethyl-2-pyrrolidinyl)methyl]-2-hydroxy-3-iodo-6-methoxybenzamide (123I-IBZM) and 123I-epidepride. 123I-epidepride is generally superior to 123I-IBZM for the visualization of D2 receptors on pituitary macroadenomas. However, 123I-IBZM and 123I-epidepride scintigraphy are generally not useful to predict the response to dopaminergic treatment in pituitary tumour patients. These techniques might allow discrimination of non-functioning pituitary macroadenomas from other non-tumour pathologies in the sellar region. Dopamine D2 receptors on pituitary tumours can also be studied using positron emission tomography with 11C-N-raclopride and 11C-N-methylspiperone.

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S E Franck, A J van der Lely, P J D Delhanty, J O L Jørgensen and S J C M M Neggers

Background

Doses of the GH receptor (GHR) antagonist pegvisomant (PEGV) that normalize insulin-like growth factor 1 (IGF1) levels vary widely among acromegaly patients. Predictors for PEGV response are baseline IGF1 levels, sex, body weight and previous radiotherapy. A GHR polymorphism lacking exon 3 (d3-GHR) is frequent in the general population. The influence of d3-GHR on PEGV responsiveness in acromegaly is unclear.

Objective

To assess the influence of d3-GHR on IGF1 levels and PEGV responsiveness in acromegaly patients using combined PEGV and long-acting somatostatin receptor ligand (LA-SRIF) treatment.

Design

Data were collected at the Rotterdam Pituitary Centre between 2004 and 2013. Patients with elevated IGF1 levels (>1.2 upper limit of normal; n=112) and over 6 months of high-dose LA-SRIF treatment were co-treated with PEGV. GHR genotype was assessed using genomic DNA in 104 patients.

Results

D3-GHR was observed in 51 (49.0%) of the patients (7.7% homozygous, 41.3% heterozygous) and was in Hardy–Weinberg equilibrium (P=0.859). Baseline characteristics were similar in d3-GHR and full-length (fl)-GHR genotypes. During PEGV/LA-SRIF treatment IGF1 levels were not different between d3-carriers and non-carriers. Similarly, no difference in PEGV dose required to normalize IGF1 (P=0.337) or PEGV serum levels (P=0.433) was observed between the two groups. However, adenoma size decreased significantly (>20% of largest diameter) in 25.6% of the fl-GHR genotype but only in 7.5% of d3-carriers (P=0.034, OR: 4.6 (CI: 1.1–18.9)).

Conclusions

GHR genotype does not predict the IGF1 normalizing dose of PEGV in acromegaly patients using combination PEGV/LA-SRIF treatment. However, fewer d3-carriers showed significant reductions in adenoma size.

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R A Alwani, L W Schmit Jongbloed, F H de Jong, A J van der Lely, W W de Herder and R A Feelders

Objective

To evaluate the diagnostic performance of four different tests in order to differentiate between Cushing's disease (CD) and pseudo-Cushing's syndrome (PCS).

Methods

In this prospective study, a total of 73 patients with clinical features of hypercortisolism and insufficient suppression of serum cortisol after 1 mg overnight dexamethasone and/or an elevated excretion of cortisol in 24-h urine samples were included. The circadian rhythm of serum cortisol levels as well as midnight serum cortisol (MserC) levels were assessed in all 73 patients. Late-night salivary cortisol (LNSC) concentrations were obtained in 44 patients. The dexamethasone–CRH (Dex–CRH) test was performed in 54 patients.

Results

Fifty-three patients were diagnosed with CD and subsequently treated. Twenty patients were classified as having PSC. Serum cortisol circadian rhythm: the diurnal rhythmicity of cortisol secretion was retained in PCS. A cortisol midnight:morning ratio of >0.67 is highly suggestive of CD (positive predictive value (PPV) 100% and negative predictive value (NPV) 73%). MserC concentration >243 nmol/l has a PPV of 98% in predicting true CD (NPV 95%). LNSC level >9.3 nmol/l predicted CD in 94% of patients (NPV 100%). Dex–CRH test: after 2 days of dexamethasone suppression, a CRH-stimulated cortisol level >87 nmol/l (T=15 min) resulted in a PPV of 100% and an NPV of 90%.

Conclusion

The Dex–CRH test as well as a single measurement of cortisol in serum or saliva at late (mid-) night demonstrated high diagnostic accuracy in differentiating PCS from true CD.

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W van Dorp, K Blijdorp, J S E Laven, R Pieters, J A Visser, A J van der Lely, S J C M M Neggers and M M van den Heuvel-Eibrink

Objective

Obesity and gonadal dysfunction are known major side effects of treatment in adult childhood cancer survivors (CCS). In the general population, obesity has a negative influence on female fertility. We aimed to evaluate whether obesity and serum insulin are associated with decreased ovarian reserve markers in CCS.

Design

Retrospective single-center cohort study.

Methods

Data of 191 female survivors of childhood cancer were analyzed. Median follow-up time was 18.8 (2.3–48.8) years. Outcome measures were serum anti-Müllerian hormone (AMH) and total follicle count (FC). Potential risk factors were: BMI; body composition measures, determined by dual-energy X-ray absorptiometry (total fat percentage, lean body mass, and visceral fat percentage); and fasting insulin.

Results

Lower serum AMH was found in obese subjects (β (%) −49, P=0.007) and in subjects with fasting insulin in the highest tertile (β (%) −43, P=0.039). Total fat percentage tends to be associated with serum AMH (β (%) −2.1, P=0.06). Survivors in the highest tertile of insulin had significantly lower FC than survivors in the lowest tertile (β −6.3, P=0.013). BMI and other measures of body composition were not associated with FC. Correlation between serum AMH and antral follicle count (AFC) was ρ=0.32 (P=0.08).

Conclusions

Obesity and insulin resistance are associated with gonadal damage, as reflected by decreased AMH and reduced FC in adult survivors of childhood cancer. In contrast to its highly predictive value for AFC in the healthy female population, serum AMH does not seem to correlate as well with AFC in CCS.

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A Muhammad, A J van der Lely, R D O’Connor, P J Delhanty, J Dal, A H Dallenga, R A Feelders, J A M J L Janssen, J O L Jorgensen and S J C M M Neggers

Abstract

Context

Although combination therapy of acromegaly with long-acting somatostatin analogs (LA-SSAs) and pegvisomant (PEGV) normalizes insulin-like growth factor-1 (IGF1) levels in the majority of patients, it requires long-term adherence. Switching from combination therapy to monotherapy with weekly PEGV could improve patients’ comfort, but the efficacy is unknown.

Objective

To assess the efficacy of switching to PEGV monotherapy in patients well controlled on combination therapy of LA-SSAs and PEGV.

Design

Single-center, open-label observational pilot study. LA-SSA therapy was discontinued at baseline and all patients were switched to PEGV monotherapy for 12 months. If IGF1 levels exceeded 1.0 times upper limit of normal (ULN), PEGV dose was increased by 20 mg weekly.

Subjects and methods

The study included 15 subjects (eight males), with a median age of 58 years (range 35 – 80) on combination therapy of high-dose LA-SSAs and weekly PEGV for >6 months, and IGF1 levels within the normal range. Treatment efficacy was assessed by measuring serum IGF1 levels.

Results

After 12 months of weekly PEGV monotherapy, serum IGF1 levels of 73% of the subjects remained controlled. In one patient, LA-SSA had to be restarted due to recurrence of headache. IGF1 levels increased from a baseline level of 0.62 × ULN (range 0.30 – 0.84) to 0.83 × ULN (0.30 – 1.75) after 12 months, while the median weekly PEGV dose increased from 60 (30 – 80) mg to 80 (50 – 120) mg.

Conclusion

Our results suggest that switching from combination therapy of LA-SSAs and PEGV to PEGV monotherapy can be a viable treatment option for acromegaly patients without compromising efficacy.