Abstract | BACKGROUND: AIM OF THE STUDY: To assess SSTR2 and SSTR5 expression in three groups of somatotroph adenomas: drug-naive, treated with long-acting (LA) SSA monotherapy, or LA-SSA/PEGV combination therapy before surgery. Additionally, we evaluated the required PEGV dose to achieve insulin-like growth factor I ( IGF-I) normalization in relation to the SSTR expression. MATERIALS AND METHODS: At our Pituitary Center Rotterdam, we selected acromegalic patients who underwent transsphenoidal neurosurgery. All patients were eventually treated with LA-SSA/PEGV combination therapy during their medical history. SSTR2 and SSTR5 expression in somatotroph adenoma tissues was determined using immunohistochemistry. RESULTS: Out of 39 somatotroph adenoma tissue samples, 23 were drug-naive, 9 received pretreatment with LA-SSA and 7 LA-SSA/PEGV combined treatment. SSTR2 expression was significantly higher in treatment-naive compared to combined treatment somatotroph adenomas (p = 0.048), while SSTR5 expression did not differ. Noteworthy, SSTR2 expression in naive somatotroph adenoma tissues was inversely correlated with the required PEGV dose to achieve IGF-I normalization during postsurgical medical treatment (ρ = -0.538, p = 0.024). CONCLUSION: In our specific cohort, the SSTR2 expression was lower in patients pretreated with LA-SSA/PEGV compared to the drug-naive acromegalic patients. Additionally, the SSTR2 expression in treatment-naive somatotroph adenoma tissues was inversely correlated with the required PEGV dose to achieve IGF-I normalization.
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Authors | Sanne E Franck, Federico Gatto, Aart Jan van der Lely, Joseph A M J L Janssen, Alof H G Dallenga, A Paul Nagtegaal, Leo J Hofland, Sebastian J C M M Neggers |
Journal | Neuroendocrinology
(Neuroendocrinology)
Vol. 105
Issue 1
Pg. 44-53
( 2017)
ISSN: 1423-0194 [Electronic] Switzerland |
PMID | 27455094
(Publication Type: Journal Article)
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Copyright | © 2016 The Author(s) Published by S. Karger AG, Basel. |
Chemical References |
- Receptors, Somatostatin
- SSTR2 protein, human
- Human Growth Hormone
- Somatostatin
- Insulin-Like Growth Factor I
- somatostatin receptor 5
- pegvisomant
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Topics |
- Adenoma
(drug therapy, metabolism, surgery)
- Adult
- Antineoplastic Combined Chemotherapy Protocols
(therapeutic use)
- Female
- Gene Expression Regulation, Neoplastic
(drug effects)
- Growth Hormone-Secreting Pituitary Adenoma
(drug therapy, metabolism, surgery)
- Human Growth Hormone
(analogs & derivatives, therapeutic use)
- Humans
- Insulin-Like Growth Factor I
(metabolism)
- Male
- Middle Aged
- Neurosurgery
(methods)
- Nose
(surgery)
- Receptors, Somatostatin
(genetics, metabolism)
- Retrospective Studies
- Somatostatin
(analogs & derivatives, therapeutic use)
- Statistics, Nonparametric
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