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Prediction of Tumor Shrinkage in Acromegaly

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00616408
Recruitment Status : Completed
First Posted : February 15, 2008
Last Update Posted : February 15, 2008
Information provided by:
Federico II University

Brief Summary:

In the last two decades, somatostatin analogs have become a cornerstone of medical therapy for acromegaly. One year of treatment with octreotide-LAR (LAR) controls GH and IGF-I excess in 54% and 63% of unselected patients, with an increasing proportion of subjects achieving IGF-I normalization prolonging the treatment. Clinically significant tumor shrinkage (20-30% vs. baseline) has also been reported, with a higher proportion in patients treated first-line [231 of 448 patients (52%)] than in those treated after surgery and/or radiotherapy [52 of 248 patients (21%)]. The highest rate of clinically significant shrinkage (>20%) occurred in patients treated first-line with LAR (80%) as compared to the short-lasting octreotide formulation (50%) or lanreotide slow-release formulation (35%. In 99 de novo patients with acromegaly, we recently reported control of GH levels in 57.6%, of IGF-I levels in 45.5% and a greater than 50% tumor shrinkage in 44.4% after 12 months of first-line treatment with somatostatin analogues, either LAR or lanreotide. Besides the different drug used, the duration of treatment also plays an important role on the shrinkage magnitude. In a homogeneous cohort of 56 patients treated with LAR only and continuously for 24 months, we noted an even more sustained effect on tumor shrinkage: overall, tumor volume decreased by 68.1±16.5% using dosages up-titrated to 40 mg every 28 days.

Despite this evidence, there is still a debate on the use of first-line treatment with somatostatin analogues. Of paramount importance would be the possibility to predict the results of one year treatment early after treatment beginning. Controversy has been reported on the predictive value of initial tumor size, inhibition of GH and IGF-I levels during treatment, and dose or type of the somatostatin analogue used during treatment. We found that percent suppression of IGF-I after 12 months of LAR treatment was the parameter that best predicted the amount of tumor shrinkage after the same period, but did not investigate the results of short-term treatment in the same series.

This observational, analytical, open, retrospective study was designed to evaluate the predictive value of tumor shrinkage, GH and IGF-I suppression after 3 months of Octreotide-LAR (LAR) on tumor shrinkage obtained after 12 months. As secondary parameters we also studied baseline patients profile such as age of diagnosis, gender, estimated disease duration, GH and IGF-I levels and tumor size.

Condition or disease Intervention/treatment
Acromegaly Drug: Octreotide-LAR

Detailed Description:

From Jan 1st 1995 to December 31st 2006, all files of patients with newly diagnosed active acromegaly out of the 297 patients coming to our Department for acromegaly who received first-line treatment with LAR will be considered for this study.

As our routine procedure, all patients signed an informed consent to approve diagnostic testing, treatment decision, methods for follow-up and data treatment for scientific purposes. This study has been conducted in accordance with the Helsinki II Declaration on human experimentation. This study takes advantage from data collected in a large, prospective study to investigate the effect of first-line surgery or medical therapy (with somatostatin analogues and/or dopamine/agonists) on GH, IGF-I, tumor mass, cardiovascular risk markers, cardiomyopathy, hypertension, metabolic profile and prostate diseases in all the patients coming for a diagnosis of acromegaly in our Department and approved by our Ethical Committee the 14/10/97 (no.60/97).

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Study Type : Observational
Actual Enrollment : 61 participants
Observational Model: Cohort
Time Perspective: Retrospective
Official Title: Predictive Value of 3 Months Results on 12 Months Tumor Shrinkage After First-Line Octreotide-LAR Therapy in Patients With Acromegaly
Study Start Date : January 1997
Actual Primary Completion Date : December 2007
Actual Study Completion Date : December 2007

Resource links provided by the National Library of Medicine

Group/Cohort Intervention/treatment
Newly diagnosed active acromegaly out of the 297 patients coming to our Department for acromegaly who received first-line treatment with LAR
Drug: Octreotide-LAR
Initial dose is 20 mg every 28 d for three months, then the dose is down-titrated to 10 mg/q28d if GH levels are below 1 ng/ml, up-titrated to 30 mg/q28d if GH levels are above 10 ng/ml and remains to 20 mg/q28 d if GH is between 1-10 ng/ml
Other Name: Sandostatin (Novartis Pharma)

Primary Outcome Measures :
  1. GH and IGF-I age-normalized levels, percent GH and IGF-I suppression and percent tumor shrinkage after 3 months [ Time Frame: 12 months ]

Secondary Outcome Measures :
  1. baseline age, gender, estimated disease duration, GH and IGF-I levels, tumor size [ Time Frame: 12 months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 85 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Newly diagnosed patients with acromegaly treated first-line with octreotide-LAR

Inclusion Criteria:

  • No previous treatment for acromegaly

Exclusion Criteria:

  • primary surgery
  • concomitant hyperprolactinemia requiring combined somatostatin analogues and dopamine-agonist treatment
  • primary treatment with lanreotide

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00616408

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Department of Molecular and Clinical Endocrinology and Oncology, University Federico II of Naples
Naples, Italy, 80131
Sponsors and Collaborators
Federico II University
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Principal Investigator: Annamaria Colao, MD University Federico II of Naples

Publications of Results:

Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Annamaria Colao, Department of Molecular and Clinical Endocrinology and Oncology University Federico II of Naples Identifier: NCT00616408    
Other Study ID Numbers: NeuroendoUnit-8
First Posted: February 15, 2008    Key Record Dates
Last Update Posted: February 15, 2008
Last Verified: December 2007
Keywords provided by Federico II University:
GH-secreting tumors
Additional relevant MeSH terms:
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Bone Diseases, Endocrine
Bone Diseases
Musculoskeletal Diseases
Pituitary Diseases
Hypothalamic Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Endocrine System Diseases
Gastrointestinal Agents
Antineoplastic Agents, Hormonal
Antineoplastic Agents