Aims: To test whether selenium administration affects autoantibodies to thyroid peroxidase (anti-TPO) and thyroglobulin (anti-TG) titres in chronic autoimmune (Hashimoto's - HT) thyroiditis.
Methods: A prospective, open-label, quasi-randomised study in 86 HT patients (n = 86) assigned to either selenomethionine (Seme) 200μg daily for 3 months (Se3, n = 15) or 6 months (Se6, n = 46) or placebo (Control, n = 25). Serum Se, anti-TPO, anti-TG and thyroid hormones were measured in all patients at baseline, 3 and 6 months. A subgroup of 18 patients (twelve on Se6 and six controls) were subjected in thyroid fine-needle biopsy at baseline and 6 months to detect changes in lymphocyte infiltration.
Results: No significant difference in anti-TPO levels was recorded after 3 (p = 0.88) or 6 months (p = 0.62) on Seme. Anti-TG levels decreased both at 3 months (p = 0.001) and 6 months (p = 0.001). No significant changes in thyroid stimulating hormone, free thyroxine and free triiodothyronine levels or in the lymphocytes' number in thyroid cytology specimens were detected. Age, gender, duration of disease, baseline anti-TPO levels and per cent change in Se levels could not predict the response of anti-TPO levels to Seme administration.
Conclusion: Our data suggest that Seme administration in pharmacological doses for a period of 6 months seems to have no significant effect on serum thyroid auto-antibodies' levels or lymphocyte infiltration of the thyroid gland.
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