Selenium Supplementation in Autoimmune Thyroiditis
Selenium Supplementation in Autoimmune Thyroiditis
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.
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.
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