Selenium Supplementation in Autoimmune Thyroiditis

Not Applicable

Completed

• Conditions: Autoimmune Thyroiditis
• Interventions: Dietary Supplement: Placebo; Dietary Supplement: SelenoPRECISE

• Registration Number: NCT02013479
• Lead Sponsor: Steen Bonnema

Brief Summary

Our aim is to investigate if selenium supplementation versus placebo adjuvant to the standard treatment with levothyroxine (LT4) in patients with autoimmune thyroiditis will lead to improved thyroid specific quality of life, and reduced autoimmune activity. The trial will include 472 participants (2 X 236) from four clinical trial sites.

Detailed Description

Background: Chronic autoimmune thyroiditis (AIT) is a common autoimmune disease that often leads to impaired function of the thyroid gland, increases in incidence with age, and has an 8-9 time female preponderance. Quality of life is often impaired and complaints persist in a considerable number of patients, even after restoration of euthyroidism. The autoimmune component of the disease has been suggested as an explanation for this. Selenium is a micro nutritive essential for human health and the thyroid gland has the highest selenium concentration of all human tissues. Selenoproteins catalyse thyroid hormone metabolism and anti-oxidative processes in thyrocytes. In addition they are important to immune function. In Denmark, patients with AIT have lower blood selenium concentration than the background population. The majority of 13 randomised trials have shown that selenium supplementation decreases serum thyroid peroxidase antibody levels (TPO-Ab) in patients with AIT, when compared with placebo. We hypothesise that adjuvant selenium may be beneficial in the treatment of AIT.

Objectives: To investigate if selenium supplementation versus placebo adjuvant to the standard treatment with levothyroxine (LT4) in patients with AIT will lead to improved thyroid specific quality of life, and reduced autoimmune activity.

Design and trial size: The CATALYST trial is an investigator-initiated randomised, blinded, multicentre clinical trial of selenium supplementation versus placebo in patients with AIT. The trial will include 472 participants (2 X 236) from four clinical trial sites.

Intervention and duration: The experimental intervention group will receive 200 μg selenium-enriched yeast as two oral tablets once daily for 12 months. The control group will receive two placebo tablets, identical in appearance, taste and smell, once daily for 12 months. Six months additional follow-up leads to a trial duration of 18 months. The experimental supplement will be SelenoPrecise® by Pharma Nord ApS.

Time schedule: July 2012 - February 2014: preparation, approval and trial registration . March 2014: first participant first visit. March 2016: last participant first visit. September 2017: last participant last visit. Autumn 2017: analysis of biological samples and data, preparation of manuscripts.

Study Timeline

• Study First Submitted: 2013-12-03
• Study First Submitted QC: 2013-12-11
• Study First Posted: 2013-12-17
• Study Start: 2014-06
• Primary Completion: 2023-03-23
• Study Completion: 2023-03-23
• Status Verified: 2023-10
• Last Update Submitted: 2023-10-30
• Last Update Posted: 2023-10-31

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 415

Inclusion Criteria

1. Age ≥18 years.

2. Serum-TPO-Ab ≥ 100 IU/mL measured within the last 12 months.

3. Receiving LT4 treatment.

   • Serum-TSH ≥ 4.0 mU/L measured prior to treatment initiation

4. Written informed consent.

Exclusion Criteria

1. Previous diagnosis of toxic nodular goitre, Graves' hyperthyroidism, post-partum thyroiditis or thyroid associated orbitopathy (TAO).
2. Previous radioiodine therapy, anti-thyroid treatment or thyroid surgery.
3. Previous diagnosis of non-melanoma skin cancer.
4. Morbidity, rendering the participant unable to process patient reported outcomes or receive intervention during the trial.
5. Systemic immunomodulatory medication.
6. Other medication known to affect thyroid function.
7. Pregnancy, breastfeeding, or planned pregnancy within 18 months.
8. Allergy towards the components in the selenium or placebo pills.
9. Intake of selenium supplementation ≥ 55 μg/d.
10. Unable to read or understand Danish.
11. Lack of informed consent

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Placebo	Placebo	Placebo
SelenoPRECISE	SelenoPRECISE	SelenoPRECISE

Primary Outcome Measures

Name	Time	Method
Thyroid related quality of life	12 months after initation of intervention	Measured in composite score based on the ThyPRO questionnaire

Secondary Outcome Measures

Name	Time	Method
Thyroid peroxidase antibody concentration (TPO-Ab)	12 months after initation of intervention
Levothyroxine (LT4) dosage	12 months after initation of intervention

Trial Locations

Locations (4)

Department of Endocrinology and Gastroenterology, Bispebjerg Hospital; 🇩🇰 Copenhagen, Denmark

Clinic of Medical Endocrinology, Copenhagen University Hospital, Rigshospitalet; 🇩🇰 Copenhagen, Denmark

Department of Internal Medicine, Hospital of South West Denmark; 🇩🇰 Esbjerg, Denmark

Department of Endorcrinology and Metabolism, Odense University Hospital; 🇩🇰 Odense, Denmark