ArticleThyroid research2025
Challenges in subtyping disease entities of thyroid dysfunction following combined immune checkpoint inhibitor therapy: a case report.
Article in Thyroid research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Spatiotemporal Imaging Dynamics and Divergent Immune Mechanisms ofChemical & biomedical imaging · 2026Article
- Immune checkpoint inhibitor-related thyroid dysfunction during treatment of lung cancer: a disproportionality analysis based on the FDA adverse event reporting system.Frontiers in immunology · 2026Article
- The "polyglandular crisis" behind recurrent hyponatremia: misdiagnosis of a case of autoimmune polyglandular syndrome type 2 and clinical lessons learned.Frontiers in immunology · 2026Article
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Abstract
backgroundImmune checkpoint inhibitor (ICI) therapy is used in the management of advanced malignancies. Thyroid function abnormalities have been reported, but more evidence is needed to substantiate the subtypes and course of thyroid disease associated with this treatment. CASE PRESENTATION: A 51-year-old woman with metastatic pancreatic cancer and no previous history of autoimmune disease was referred to the Endocrine Department six days after the initiation of combined treatment with ipilimumab (anti-CTLA-4) and nivolumab (anti-PD-1). At the initial endocrinologic assessment, the patient had biochemical overt thyrotoxicosis with suppressed thyroid stimulating hormone < 0.01 mIU/L (reference range (RR), 0.3-4.5 mIU/L), elevated total thyroxine (TT4) > 309 nmol/L (> 24.0 µg/dL) (RR, 60-140 nmol/L; 4.7-10.9 µg/dL), and total triiodothyronine (TT3) 7.0 nmol/L (454.5 ng/dL) (RR, 1.1-2.5 nmol/L; 71.4-162.3 ng/dL). Despite marked biochemical thyrotoxicosis, the patient presented with few symptoms. TSH-receptor antibodies (TRAb) were negative, as were thyroid peroxidase antibodies, whereas elevated levels of thyroglobulin antibodies were found. Thyroid ultrasound revealed an enlarged, heterogeneous hypoechoic gland with increased vascularity. High-dose antithyroid drug (ATD) therapy were followed by a decline in thyroid hormone levels (after one week of treatment: TT4: >309 nmol/L (> 24.0 µg/dL); TT3: 1.8 nmol/L (116.9 ng/dL); after two weeks: TT4: 164 nmol/L (12.7 µg/dL); TT3: 0.9 nmol/L (58.4 ng/dL)). After five weeks, the patient developed biochemical hypothyroidism. Thus, ATD therapy was discontinued, and levothyroxine was initiated.
conclusionThis case report illustrates with a short time frame from the initiation of ICI therapy the onset of thyrotoxicosis, followed by the development of thyroid insufficiency. This case highlights the challenges associated with subtyping the cause of thyroid dysfunction in patients treated with ICIs. Further, this case highlights the importance of clinical awareness and close monitoring of thyroid function in patients receiving immunotherapy.
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