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Background <p>Semaglutide, a glucagon-like peptide-1 receptor agonist (GLP-1 RA), is widely used for the management of type 2 diabetes, metabolic syndrome, and obesity. Concerns regarding its potential association with thyroid cancer, particularly medullary thyroid carcinoma, have emerged, although current human evidence remains inconclusive. Reports of papillary thyroid carcinoma (PTC) while using semaglutide therapy are exceedingly rare.</p> Case presentation <p>We describe a 40-year-old man with metabolic syndrome and obesity who had been treated with semaglutide for several years before discontinuation. A routine chest computed tomography (CT) performed for an unrelated diaphragmatic hernia identified a suspicious thyroid lesion, later confirmed by ultrasound as a 1 × 1&#xa0;cm irregular hypoechoic nodule in the left lobe with several small ipsilateral lymph nodes demonstrating suspicious features. Fine-needle aspiration cytology revealed classic PTC (Bethesda VI). The patient underwent total thyroidectomy with left selective neck dissection and central compartment dissection. Histopathology confirmed a unifocal classic variant PTC, 16&#xa0;mm in size, with negative margins, no lymph node involvement, and no extrathyroidal extension. After an uncomplicated postoperative course, he was prescribed levothyroxine for TSH suppression and discharged.</p> Conclusion <p>This case of PTC discovered concomitantly while the patient was on semaglutide therapy highlights an important clinical scenario but does not provide evidence of causation. The totality of available human data continues to support the safety of semaglutide with respect to thyroid cancer risk. Further long-term surveillance and high-quality epidemiological studies remain warranted.</p>

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Papillary thyroid carcinoma discovered in a patient on semaglutide therapy for metabolic syndrome: a case presentation and review of current evidence

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Jawad Haddadin,
  • Aus Haddad,
  • Lina Nahar,
  • Osama Hamarneh,
  • Fares Haddad

摘要

Background

Semaglutide, a glucagon-like peptide-1 receptor agonist (GLP-1 RA), is widely used for the management of type 2 diabetes, metabolic syndrome, and obesity. Concerns regarding its potential association with thyroid cancer, particularly medullary thyroid carcinoma, have emerged, although current human evidence remains inconclusive. Reports of papillary thyroid carcinoma (PTC) while using semaglutide therapy are exceedingly rare.

Case presentation

We describe a 40-year-old man with metabolic syndrome and obesity who had been treated with semaglutide for several years before discontinuation. A routine chest computed tomography (CT) performed for an unrelated diaphragmatic hernia identified a suspicious thyroid lesion, later confirmed by ultrasound as a 1 × 1 cm irregular hypoechoic nodule in the left lobe with several small ipsilateral lymph nodes demonstrating suspicious features. Fine-needle aspiration cytology revealed classic PTC (Bethesda VI). The patient underwent total thyroidectomy with left selective neck dissection and central compartment dissection. Histopathology confirmed a unifocal classic variant PTC, 16 mm in size, with negative margins, no lymph node involvement, and no extrathyroidal extension. After an uncomplicated postoperative course, he was prescribed levothyroxine for TSH suppression and discharged.

Conclusion

This case of PTC discovered concomitantly while the patient was on semaglutide therapy highlights an important clinical scenario but does not provide evidence of causation. The totality of available human data continues to support the safety of semaglutide with respect to thyroid cancer risk. Further long-term surveillance and high-quality epidemiological studies remain warranted.