Effect of Metformin on Decrement in Levothyroxin Dose Required for Thyroid Stimulating Hormone (TSH) Suppression in Patients With Differentiated Thyroid Cancer

April 25, 2011 updated by: Mashhad University of Medical Sciences
Differentiated thyroid cancer is the most common neoplasm of endocrine system. After surgery and radioiodine treatment, thyroid stimulating hormone (TSH) suppression is the main goal which is achieved with levothyroxine treatment. Levothyroxine causes increased thyroid hormones which can have negative impact on bone and cardiovascular system. Anecdotal reports have shown that metformin can induce TSH suppression without change in T3 and T4 concentration. The purpose of this study was to prescribe metformin as additional drug to levothyroxin in order to decrease levothyroxine dosage.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

51

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Iran, Islamic Republic of
    • Khorasan Razavi
      • Mashad, Khorasan Razavi, Iran, Islamic Republic of
        • Mashad University of Medical Sciences

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

No older than 80 years (Child, Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • papillary or follicular thyroid cancer
  • stage 1 or 2 according to TNM system version 6
  • surgery and radioiodine treatment
  • levothyroxine suppression treatment

Exclusion Criteria:

  • cardiopulmonary failure
  • liver failure
  • renal failure
  • pregnancy
  • drugs (colestyramin, sucralfate, phenobarbital, phenytoin, carbamazepin, rifampin, amiodarone, chloroquin, androgens, sertraline, frusemide, heparin)

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: metformin
patients who receive metformin in addition to levothyroxine
Drug: Metformin
in case group metformin is added to levothyroxine and levothyroxine is decreased by 30% .in control group levothyroxine is reduced by 30% and no metformin is added to the regimen.
Placebo Comparator: levothyroxine
patients who receive only levothyroxine
Drug: Metformin
in case group metformin is added to levothyroxine and levothyroxine is decreased by 30% .in control group levothyroxine is reduced by 30% and no metformin is added to the regimen.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
TSH
Time Frame: 3 months
3 months

Secondary Outcome Measures

Outcome Measure
Time Frame
freeT3,freeT4
Time Frame: 3months
3months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Mashhad University of Medical Sciences

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

April 1, 2010

Primary Completion (Actual)

April 1, 2011

Study Completion (Actual)

April 1, 2011

Study Registration Dates

First Submitted

April 18, 2011

First Submitted That Met QC Criteria

April 25, 2011

First Posted (Estimate)

April 26, 2011

Study Record Updates

Last Update Posted (Estimate)

April 26, 2011

Last Update Submitted That Met QC Criteria

April 25, 2011

Last Verified

April 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • METTC

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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