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Decrease of Serum IGF-I following Transsphenoidal Pituitary Surgery for Acromegaly.

Min Yu1, David E Bruns2, John A Jane3

  • 1Division of Laboratory Medicine, Department of Pathology, my7m@virginia.edu.

Clinical Chemistry
|December 16, 2016
PubMed
Summary
This summary is machine-generated.

A rapid decline in insulin-like growth factor-1 (IGF-I) levels within 72 hours after surgery can help predict acromegaly remission. This IGF-I decrease, alongside growth hormone (GH) levels, offers early insight into treatment success post-pituitary tumor resection.

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Area of Science:

  • Endocrinology
  • Neurosurgery
  • Biochemistry

Background:

  • Acromegaly is caused by growth hormone (GH)-secreting pituitary tumors.
  • Postoperative GH levels alone are insufficient for predicting acromegaly remission.
  • Insulin-like growth factor-1 (IGF-I) mediates many GH actions.

Purpose of the Study:

  • To determine the rate of IGF-I decline in the 72 hours after pituitary tumor resection.
  • To evaluate IGF-I as an early predictor of acromegaly remission.

Main Methods:

  • Studied patients undergoing pituitary surgery for acromegaly.
  • Measured IGF-I using LC-MS and GH using immunoassay.
  • Defined remission based on postoperative GH and IGF-I levels at 8 weeks.

Main Results:

  • Mean IGF-I decline rate was 185 ng/mL per 24 h in remission patients.
  • 87% of remission patients had IGF-I <65% of preoperative levels by postoperative day 2.
  • Combined IGF-I and GH measurements on day 2 effectively distinguished remission from non-remission groups.

Conclusions:

  • Rapid postoperative IGF-I decline is a promising early indicator of acromegaly remission.
  • IGF-I measurement may serve as an independent adjunct to GH levels for predicting remission.
  • Further research is warranted to validate IGF-I's role in early acromegaly remission prediction.