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Autoimmune thyroid diseases are more common in patients with prolactinomas: a retrospective case–control study in an Italian cohort

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Abstract

Background

Prolactin may exert immunological effects. Over the years, a higher prevalence of autoimmune thyroid diseases (ATD) has been reported in patients with prolactinomas (PRLs) in areas with sufficient iodine intake.

Purpose

The aim of our study was to evaluate the prevalence of ATD [Graves’ disease (GD) and chronic autoimmune thyroiditis (AIT)] in a retrospective cohort of Italian patients with PRLs compared to a sex-matched control group, represented by subjects with non-functioning pituitary adenoma (NFPA) or empty sella (ES).

Materials and methods

We enrolled 149 patients (108 F/41 M) with PRLs (110 micro/39 macro) and 143 subjects (100 F/43 M) with NFPA (n = 96, 56 micro/40 macro) or ES (n = 47), with normal serum prolactin. Neck ultrasound and thyroid function tests (anti-thyroid antibodies, TSH, FT3 and FT4) were performed in all patients.

Results

In PRLs, median serum prolactin was significantly higher (98.3 vs. 8.9 ng/ml, p ≤ 0.0001), while age was lower (34 vs. 46 years, p ≤ 0.001) compared to controls. The prevalence of ATD was 13.4% (20/149) in PRLs (1 GD and 19 AIT) compared to 6.3% (9/143) in the controls (p = 0.042). At the multivariate analysis, serum prolactin was the only independent factor predicting ATD. Thyroid volume (12.5 ± 5.9 ml vs. 12.8 ± 10 ml, p = 0.47) and the presence of uni- or multinodular goiter (29.5% vs. 35%, p = 0.35) did not differ between PRLs and control groups.

Conclusions

Our data in an area with mild iodine deficiency confirm a higher prevalence of ATD in patients with prolactinomas.

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Funding

This research did not receive any specific grant from any funding agency in the public, commercial or not-for-profit sector.

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Authors and Affiliations

  1. Department of Medical, Surgical and Neurological Sciences, University of Siena, Siena, Italy

    T. Pilli, S. Cardinale, C. Dalmiglio, C. Secchi, N. Fralassi, G. Di Cairano, F. Maino, R. Forleo, F. Pacini & M. G. Castagna

  2. Department of Medical Biotechnologies, University of Siena, Siena, Italy

    G. Cevenini

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  1. T. Pilli
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  2. S. Cardinale
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  3. C. Dalmiglio
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  4. C. Secchi
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  7. G. Di Cairano
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Correspondence to M. G. Castagna.

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Pilli, T., Cardinale, S., Dalmiglio, C. et al. Autoimmune thyroid diseases are more common in patients with prolactinomas: a retrospective case–control study in an Italian cohort. J Endocrinol Invest 42, 693–698 (2019). https://doi.org/10.1007/s40618-018-0972-3

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  • DOI: https://doi.org/10.1007/s40618-018-0972-3

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