Abstract
Purpose
Autoimmune thyroid events (ATEs) are common side effects after alemtuzumab (ALZ) therapy in patients with multiple sclerosis (MS). Our purpose was to reach more robust evidence on prevalence and outcome of the spectrum of alemtuzumab-induced autoimmune thyroid events in patients with multiple sclerosis.
Methods
PubMed and Scopus were systematically searched through July 2019. Studies dealing with patients without personal history of thyroid dysfunctions and affected by MS treated with ALZ and reporting ATEs were selected. Data on prevalence and outcome of ATEs were extracted. A proportion of meta-analysis with random-effects model was performed.
Results
Considering the overall pooled number of 1362 MS patients treated with ALZ (seven included studies), a 33% prevalence of newly diagnosed ATEs was recorded. Among all ATEs, Graves’ disease (GD) was the most represented [63% of cases, 95% confidence interval (CI) 52–74%], followed by Hashimoto thyroiditis (15%, 95% CI 10–22%). Interestingly, GD showed a fluctuating course in 15% of cases (95% CI 8–25%). Of all GD, 12% (95% CI 2–42%) likely had spontaneous remission, 56% (95% CI 34–76%) required only antithyroid drugs, 22% (95% CI 13–32%) needed additional RAI, and 11% (95% CI 0.9–29%) underwent definitive surgery.
Conclusion
Among different categories of ATEs, Graves’ hyperthyroidism was the most common thyroid dysfunction, occurring in more than half of cases. Antithyroid drugs should represent the first-line treatment for ALZ-induced GD patients. However, alemtuzumab-induced GD could not be considered as having a more favourable outcome than conventional GD, given the substantial chance to encounter a fluctuating and unpredictable course.
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Abbreviations
- ALZ:
-
Alemtuzumab
- AAEs:
-
Adverse autoimmune events
- MS:
-
Multiple sclerosis
- ATE(s):
-
Autoimmune thyroid event(s)
- GD:
-
Graves’ disease
- GREAT:
-
Graves’ recurrent events after therapy
- CSS:
-
Clinical severity score
- CLL:
-
Chronic lymphocytic leukemia
- RCTs:
-
Randomized controlled trials
- TPOAb:
-
Thyroid peroxidase antibody
- TRAb:
-
Thyrotropin receptor antibodies
- HT:
-
Hashimoto thyroiditis
- ST:
-
Silent thyroiditis
- GO:
-
Graves’ orbitopathy
- ATD:
-
Antithyroid drugs
- RAI:
-
Radioiodine
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Acknowledgements
L.S. would like to thank the University of Federico II (Naples, Italy) for the internal grant (in “STAR program”) which allow him to work as research fellow in Department of Nuclear Medicine and Thyroid Centre, Ente Ospedaliero Cantonale (Lugano and Bellinzona, Switzerland).
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LS and PT designed and conceptualized the study, analyzed the data, and drafted the manuscript for intellectual content; all the co-authors interpreted the data and revised the manuscript for intellectual content.
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Below is the link to the electronic supplementary material. Supplemental Fig. 1. Risk of bias summary: review authors’ judgements about each risk of bias item for included non-RCTs. Supplemental Fig. 2. Risk of bias summary: review authors’ judgements about each risk of bias item for included RCTs. Supplemental Table 1. Overall studies characteristics.
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Scappaticcio, L., Castellana, M., Virili, C. et al. Alemtuzumab-induced thyroid events in multiple sclerosis: a systematic review and meta-analysis. J Endocrinol Invest 43, 219–229 (2020). https://doi.org/10.1007/s40618-019-01105-7
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DOI: https://doi.org/10.1007/s40618-019-01105-7