Prevalence and Clinicopathologic Association of Hashimoto’s Thyroiditis in Papillary Thyroid Cancer after Radioiodine (I-131) Treatment

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Korrakode Sirakriengkrai


Background: Some of the patients with papillary thyroid cancer (PTC) have coexistence of Hashimoto’s thyroiditis or chronic lymphocytic thyroiditis (CLT). Association between CLT, clinicopathologic factors and
response to radioiodine (I-131) treatment remain unclear.

Objective: To determine the prevalence of CLT in PTC and the association of coexistent CLT and the clinicopathological features of PTC.

Materials and methods: A cross-sectional analytical study was conducted among 277 patients who underwent thyroidectomy and I-131 treatment in Surat Thani Hospital between January 2009 and May 2016.
Clinical data, pathological characteristics and response to I-131 treatment were compared between the two groups according to the presence or absence of CLT. The association between CLT and clinicopathologic
factors were analyzed by logistic regression analysis.

Results: The mean age of patients was 42.9±13.0 years (range 19-84). Most of them were female (n=250, 90.2%).CLT was present in 65 cases (23.5%). Excellent response to I-131 in the CLT group was higher than the non-CLT group (80.0% vs 66.5%, p=0.038) and associated with the presence of CLT by univariate logistic regression (OR 2.01, 95%CI 1.03-3.94, p=0.041). Using multivariate logistic regression, factors associated with the presence of CLT were female (adjusted OR 10.59, 95%CI 1.31-85.65, p=0.027); tumor size ≤ 1 cm (adjusted OR 1.86, 95%CI 1.06-1.93, p=0.041); extrathyroidal extension (adjusted OR 0.25, 95%CI 0.08-0.77, p=0.016); and capsular invasion (adjusted OR 0.29, 95%CI 0.09-0.96, p=0.042).

Conclusion: The prevalence of CLT in PTC was 23.5%. CLT was associated with females and tumor sizes ≤ 1 cm. There was a tendency for excellent responses to radioiodine treatment in the patients with PTC and

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How to Cite
Sirakriengkrai, K. (2020). Prevalence and Clinicopathologic Association of Hashimoto’s Thyroiditis in Papillary Thyroid Cancer after Radioiodine (I-131) Treatment. Lampang Medical Journal, 41(1), 1–8. Retrieved from
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