Clinical Thyroidology / Original Paper
Hypothyroid Patients Encoding Combined MCT10 and DIO2 Gene Polymorphisms May Prefer L-T3 + L-T4 Combination Treatment – Data Using a Blind, Randomized, Clinical StudyCarlé A.a · Faber J.c,d · Steffensen R.b · Laurberg P.a · Nygaard B.c,d
aDepartment of Endocrinology, Aalborg University Hospital, Aalborg, Denmark
bDepartment of Clinical Immunology, Aalborg University Hospital, Aalborg, Denmark
cDepartment of Endocrinology, Herlev Hospital, University of Copenhagen, Copenhagen, Denmark
dFaculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Allan Carlé, MD, PhD
Department of Endocrinology
Aalborg University Hospital
DK–9000 Aalborg (Denmark)
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Objectives: In previous studies, around half of all hypothyroid patients preferred levo-thyroxine (L-T4) + levo-triiodothyronine (L-T3) combination therapy, 25% preferred T4, and 25% had no preference. The reason for this is yet to be explored. Methods: A total of 45 overtly autoimmune, hypothyroid patients – now euthyroid on ≥6 months’ L-T4 therapy – participated in a prospective, double-blind, cross-over study. The patients were randomized into 2 groups of either 3 continuous months’ L-T4 therapy followed by 3 months’ combination therapy or vice versa. In all periods, 50 μg L-T4 was blindly replaced by either (identical) 50 μg L-T4 or by 20 μg T3. L-T4 was hereafter adjusted to obtain normal serum TSH values. We investigated 3 single nucleotide polymorphisms (SNPs) on the type II iodothyronine deiodinase (DIO2) gene (rs225014 (Thr92Ala), rs225015, and rs12885300 (ORFa-Gly3Asp)) and 1 SNP on the cellular membrane transport-facilitating monocarboxylate transporter (MCT10) gene (rs17606253), and asked in which of the 2 treatment periods patients felt better (i.e., which treatment was preferred). Results: 27 out of 45 patients (60%) preferred the combination therapy. Two polymorphisms (rs225014 (DIO2, Thr92Ala) and rs17606253 (MCT10)) were combined yielding 3 groups: none vs. 1 of 2 vs. both SNPs present, and 42 vs. 63 vs. 100% of our patients in the 3 groups preferred the combined treatment (Jongheere-Terpstra trend test, p = 0.009). Conclusion: The present study indicates that the combination of polymorphisms in DIO2 (rs225014) and MCT10 (rs17606253) enhances hypothyroid patients’ preference for L-T4 + L-T3 replacement therapy. In the future, combination therapy may be restricted or may be even recommended to individuals harbouring certain polymorphisms.
© 2017 European Thyroid Association. Published by S. Karger AG, Basel
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