Clinical trial NCT01371045: Oral Glucose Tolerance Testing (OGTT) on Patients Taking Somatostatin Analogs
Official title: Hormonal and Metabolic Responses to Oral Glucose During Somatostatin Analog Use
Study type: OBSERVATIONAL
Overall status: WITHDRAWN
Conditions: Acromegaly
Keywords: Acromegaly
Growth Hormone
Carcinoid Syndrome
Somatostatin
Lead sponsor: Cedars-Sinai Medical Center
Sponsor class: OTHER
First posted: 2011-06-10
Enrollment: 0
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Enrollment will include subjects diagnosed with acromegaly or carcinoid syndrome who are taking long-acting somatostatin analogs for at least three months prior to study enrollment.

Brief summary: The purpose of this study is to test the effect of long-acting somatostatin analog medications, taken by patients with acromegaly or carcinoid syndrome, on growth hormone in comparison to healthy controls who are not receiving the medication in order to see whether or not the medication makes the oral glucose test less accurate. The Oral Glucose Tolerance Test (OGTT) is a standard test to measure growth hormone secretion. By comparing GH responses in non-acromegaly subjects taking somatostatin analog treatment, the relative contribution of the medication and the underlying disease state can be analyzed.

Detailed description: Subjects will be informed of the study and after providing written informed consent, subjects will be asked to undergo a 2-hour oral glucose tolerance test (ingestion of 75g glucose with subsequent timed assessment of growth hormone, glucose, insulin and related binding proteins.) Baseline assessment of hormones that may contribute to the results will be drawn, prior to performing the test. Patients will be asked to complete one visit total to participate in this trial.

Eligibility criteria: Inclusion Criteria:

* Diagnosis of acromegaly or carcinoid syndrome
* Treatment with somatostatin analog therapy (must have established a stable dose of three or more injections on the same dose prior to study enrollment)
* Healthy control subjects

Exclusion Criteria:

* Diagnosis of Diabetes Mellitus (Type 1 or Type 2)
* Use of medication for the treatment of insulin resistance or diabetes

Primary outcomes:
measure: Growth hormone response to OGTT
timeFrame: 2 hours
Secondary outcomes:
Other outcomes:
Locations:
city: Los Angeles
country: United States
facility: Cedars-Sinai Medical Center, Pituitary Center
state: California
Study officials:
affiliation: Cedars-Sinai Medical Center
name: Odelia Cooper
role: PRINCIPAL_INVESTIGATOR
References:
citation: Earll JM, Sparks LL, Forsham PH. Glucose suppression of serum growth hormone in the diagnosis of acromegaly. JAMA. 1967 Aug 21;201(8):628-30. No abstract available.
citation: Giustina A, Chanson P, Bronstein MD, Klibanski A, Lamberts S, Casanueva FF, Trainer P, Ghigo E, Ho K, Melmed S; Acromegaly Consensus Group. A consensus on criteria for cure of acromegaly. J Clin Endocrinol Metab. 2010 Jul;95(7):3141-8. doi: 10.1210/jc.2009-2670. Epub 2010 Apr 21.
citation: Vierhapper H, Heinze G, Gessl A, Exner M, Bieglmayr C. Use of the oral glucose tolerance test to define remission in acromegaly. Metabolism. 2003 Feb;52(2):181-5. doi: 10.1053/meta.2003.50036.
citation: Carmichael JD, Bonert VS, Mirocha JM, Melmed S. The utility of oral glucose tolerance testing for diagnosis and assessment of treatment outcomes in 166 patients with acromegaly. J Clin Endocrinol Metab. 2009 Feb;94(2):523-7. doi: 10.1210/jc.2008-1371. Epub 2008 Nov 25.
citation: Rubeck KZ, Madsen M, Andreasen CM, Fisker S, Frystyk J, Jorgensen JO. Conventional and novel biomarkers of treatment outcome in patients with acromegaly: discordant results after somatostatin analog treatment compared with surgery. Eur J Endocrinol. 2010 Nov;163(5):717-26. doi: 10.1530/EJE-10-0640. Epub 2010 Sep 2.
citation: ROTH J, GLICK SM, YALOW RS, BERSON SA. Secretion of human growth hormone: physiologic and experimental modification. Metabolism. 1963 Jul;12:577-9. No abstract available.
citation: Arafat AM, Mohlig M, Weickert MO, Perschel FH, Purschwitz J, Spranger J, Strasburger CJ, Schofl C, Pfeiffer AF. Growth hormone response during oral glucose tolerance test: the impact of assay method on the estimation of reference values in patients with acromegaly and in healthy controls, and the role of gender, age, and body mass index. J Clin Endocrinol Metab. 2008 Apr;93(4):1254-62. doi: 10.1210/jc.2007-2084. Epub 2008 Jan 2.