The Clinical Importance of Minimal Extrathyroid Extension on Tumor Recurrence in Patients with Papillary Thyroid Carcinoma.

Jung Min Kim; Yun Yong Lee; Chang Woon Choi; Sang Moo Lim; Seung Sook Lee; Soo Youn Cho; Guk Haeng Lee; Byeong Cheol Lee; Ka Hee Yi

doi:10.3803/EnM.2010.25.4.340

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Original Article The Clinical Importance of Minimal Extrathyroid Extension on Tumor Recurrence in Patients with Papillary Thyroid Carcinoma.: Jung Min Kim, Yun Yong Lee, Chang Woon Choi, Sang Moo Lim, Seung Sook Lee, Soo Youn Cho, Guk Haeng Lee, Byeong Cheol Lee, Ka Hee Yi; Endocrinology and Metabolism 2010;25(4):340-346
DOI: https://doi.org/10.3803/EnM.2010.25.4.340
Published online: December 1, 2010

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¹Department of Internal Medicine, Dongnam Intsitute of Radiological & Medical Sciences, Busan, Korea.
²Department of Internal Medicine, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea. khyi@kcch.re.kr
³Department of Nuclear Medicine, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea.
⁴Department of Pathology, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea.
⁵Department of Otolaryngology-Head and Neck Surgery, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea.

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Abstract

BACKGROUND
We wanted to evaluate whether a minimal extrathyroid extension (METE) is associated with the clinicopathological parameters that are indicative of a poor prognosis, including lymph node metastasis, distant metastasis at the time of the initial diagnosis and tumor recurrence, in patients with papillary thyroid carcinoma (PTC), and especially in the patients with papillary thyroid microcarcinoma (PTMC). METHODS: We retrospectively evaluated the medical records of patients with PTC and who had undergone total thyroidectomy with/without subsequent 131I remnant ablation at the Korea Cancer Center Hospital from January 1998 through December 2005. A total of 557 patients with PTC were enrolled in the study. We excluded 13 patients with an unknown status of extension and 29 patients with massive ETE. RESULTS: Of the 515 patients, 401 were found to have a METE. We analyzed the 464 patients who were without distant metastasis at the time of the initial diagnosis and who had a follow-up duration of more than 6 months. METE was not significantly associated with tumor recurrence during the follow-up period (median follow-up period: 122 months, range: 6-142 months): 8% vs. 15% of the patients with and without METE had tumor recurrence, respectively (P = 0.069 by the log-rank test). We analyzed the effect of tumor size in the patients with METE. Size was not significantly associated with tumor recurrence (P = 0.374 by the log-rank test). CONCLUSION: These findings suggest that METE might not be a prognostic factor to predict tumor recurrence in patients with PTC, including PTMC.

Keywords: Extrathyroid extension;Papillary thyroid carcinoma;T3;

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