Long-term changes in serum IGF-1 levels after successful surgical treatment of growth hormone-secreting pituitary adenoma

Mi Seon Shin, Ji Hee Yu, Jong Han Choi, Chang Hee Jung, Jenie Yoonoo Hwang, Young Hyun Cho, Chang Jin Kim, Min Seon Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Background: Successful treatment of acromegaly is known to normalize serum insulin-like growth factor 1 (IGF-1) levels within days after surgery. However, our clinical observations indicate that many cases of acromegaly show delayed normalization of serum IGF-1 levels after complete tumor resection. Objective: To study long-term changes of the serum IGF-1 levels in acromegalic patients for whom surgical treatment was thought to be successful. Methods: A retrospective observational study was performed with 46 acromegalic patients with no residual tumor on sellar magnetic resonance imaging, and a nadir growth hormone of less than 0.4 μg/L on a postoperative oral glucose tolerance test. Results: In all patients, serum IGF-1 levels returned to the normal reference values for age and sex during the observational period (12-132 months). The mean duration from the time of surgery until IGF-1 normalization was 10 months (range, 3 days-57 months). Twenty-seven patients (59%) reached normal IGF-1 ranges within 3 months of surgery, whereas 19 patients (41%) experienced delayed (>3 months) IGF-1 normalization. Eleven patients (24%) recovered normal IGF-1 levels 12 to 57 months after surgery. The possibility of delayed IGF-1 cure was increased 8.8-fold with an immediate postoperative IGF-1 level increase of 100 μg/L. Conclusion: Satisfactory remission of acromegaly by IGF-1 criteria was delayed in a large proportion of acromegalic patients, especially those with high postoperative IGF-1 levels. Hence, additional treatment can be delayed in clinically stable acromegalic patients who show no evidence of residual tumors on postoperative magnetic resonance imaging and a normal growth hormone suppressive response to a glucose load.

Original languageEnglish
Pages (from-to)473-479
Number of pages7
JournalNeurosurgery
Volume73
Issue number3
DOIs
Publication statusPublished - 2013 Sep
Externally publishedYes

Keywords

  • Acromegaly
  • Growth hormone
  • Insulin-like growth factor 1
  • Pituitary tumor
  • Surgery

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology

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    Shin, M. S., Yu, J. H., Choi, J. H., Jung, C. H., Hwang, J. Y., Cho, Y. H., Kim, C. J., & Kim, M. S. (2013). Long-term changes in serum IGF-1 levels after successful surgical treatment of growth hormone-secreting pituitary adenoma. Neurosurgery, 73(3), 473-479. https://doi.org/10.1227/01.neu.0000431480.87160.84