Endocrinol Metab.  2010 Dec;25(4):340-346. 10.3803/EnM.2010.25.4.340.

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

Affiliations
  • 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.

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.

Keyword

Extrathyroid extension; Papillary thyroid carcinoma; T3

MeSH Terms

Carcinoma
Carcinoma, Papillary
Factor IX
Follow-Up Studies
Humans
Korea
Lymph Nodes
Medical Records
Neoplasm Metastasis
Prognosis
Recurrence
Retrospective Studies
Thyroid Gland
Thyroid Neoplasms
Thyroidectomy
Carcinoma
Carcinoma, Papillary
Factor IX
Thyroid Neoplasms

Figure

  • Fig. 1. Disease-free survival according to extrathyroid extension in 464 patients who were without distant metastasis at the time of the initial diagnosis. The Kaplan-Meier method for recurrence with the log rank test was used for statistical comparisons.

  • Fig. 2. Disease-free survival according to extrathyroid extension in the 429 patients with tumor smaller than 4 cm and without distant metastasis at the time of the initial diagnosis. The Kaplan-Meier method for recurrence with the log rank test was used for statistical comparisons.

  • Fig. 3. Disease-free survival according to extrathyroid extension in the 121 patients with papillary thyroid microcarcinoma and without distant metastasis at the time of the initial diagnosis. The Kaplan-Meier method for recurrence with the log rank test was used for statistical comparisons.

  • Fig. 4. Disease-free survival according to tumor size in the 358 patients with tumor with minimal extrathyroid extension and without distant metastasis at the time of the initial diagnosis. The Kaplan-Meier method for recurrence with the log rank test was used for statistical comparisons.


Reference

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