THERAPY OF ENDOCRINE DISEASE: T4 + T3 combination therapy: is there a true effect?

Wiersinga, Wilmar M

doi:10.1530/eje-17-0645

Cited by 52Thyroid Disorders and TreatmentsThyroid and Parathyroid SurgeryThyroid Cancer Diagnosis and Treatment

THERAPY OF ENDOCRINE DISEASE: T4 + T3 combination therapy: is there a true effect?

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Wiersinga, Wilmar M·2017·European Journal of Endocrinology

DOI 10.1530/eje-17-0645

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Abstract

About 5%–10% of hypothyroid patients on T4 replacement therapy have persistent symptoms, despite normal TSH levels. It was hoped that T4 + T3 combination therapy might provide better outcomes, but that was not observed according to a meta-analysis of 11 randomized clinical trials comparing T4 monotherapy with T4 + T3 combination therapy. However, the issue is still subject of much research because normal thyroid function tests in serum may not necessarily indicate an euthyroid state in all peripheral tissues. This review evaluates recent developments in the field of T4 + T3 combination therapy. T4 monotherapy is associated with higher serum FT4 levels than in healthy subjects, and subnormal serum FT3 and FT3/FT4 ratios are observed in about 15% and 30% respectively. T4 + T3 combination therapy may mimic more closely thyroid function tests of healthy subjects, but it has not been demonstrated that relatively low serum FT3 or FT3/FT4 ratios are linked to persistent symptoms. One study reports polymorphism Thr92Ala in DIO2 is related to lower serum FT3 levels after thyroidectomy, and that the D2-Ala mutant reduces T4 to T3 conversion in cell cultures. Peripheral tissue function tests such as serum cholesterol reflect thyroid hormone action in target tissues. Using such biochemical markers, patients who had a normal serum TSH during postoperative T4 monotherapy, were mildly hypothyroid, whereas those with a TSH 0.03–≤0.3 mU/L were closest to euthyroidism. Peripheral tissue function tests suggest euthyroidism more often in patients randomized to T4 + T3 rather than that to T4. Preference for T4 + T3 combination over T4 monotherapy was dose-dependently related to the presence of two polymorphisms in MCT10 and DIO2 in one small study. It is not known if persistent symptoms during T4 monotherapy disappear by switching to T4 + T3 combination therapy. The number of patients on T4 + T3 therapy has multiplied in the last decade, likely induced by indiscriminate statements on the internet. Patients are sometimes not just asking but rather demanding this treatment modality. It creates tensions between patients and physicians. Only continued research will answer the question whether or not T4 + T3 combination therapy has true benefits in some patients.

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Authors: Wiersinga, W. M.
Affiliations: Amsterdam UMC Location University of Amsterdam (NL)
Corresponding author: Wiersinga, Wilmar M
Venue: European Journal of Endocrinology
Publisher: Oxford University Press (OUP)
Published: 2017-12
Volume: 177
Issue: 6
Pages: R287-R296
ISSN: 0804-4643 (ISSN-L)
1479-683X
DOI: 10.1530/eje-17-0645
OpenAlex: W2752157522
Cited by: 52
References: 49
Citations by year: 2025: 4 · 2024: 5 · 2023: 9 · 2022: 5 · 2021: 2 · 2020: 8 · 2019: 9 · 2018: 7 · 2017: 3
FWCI: 1.07
Type: journal article
Language: en
Open access: green
pure.amsterdamumc.nl
Licence: other-oa
Locations: European Journal of Endocrinology (publishedVersion)
PubMed (publishedVersion)
Data Archiving and Networked Services (DANS) (submittedVersion)
Pure Amsterdam UMC (submittedVersion, other-oa)
Topics: Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
Keywords: levothyroxine monotherapy, hypothyroidism, free triiodothyronine, FT3/FT4 ratio, T4 to T3 conversion, serum cholesterol, thyroidectomy
MeSH terms: Drug Therapy, Combination, Humans, Hypothyroidism, Thyrotropin, Thyroxine, Triiodothyronine, Treatment Outcome, Hormone Replacement Therapy

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THERAPY OF ENDOCRINE DISEASE: T4 + T3 combination therapy: is there a true effect?

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