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Multifocality and Total Tumor Diameter Predict Central Neck Lymph Node Metastases in Papillary Thyroid Microcarcinoma

  • Endocrine Tumors
  • Published:
Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Purpose

To identify the subgroup of high-risk papillary thyroid microcarcinoma (PTMC) inclined to lymph node metastasis (LNM).

Methods

Patients who underwent total thyroidectomy with central neck dissection and had a pathologic diagnosis of PTMC between 2003 and 2010 at Wuhan Union Hospital were identified. The frequency of LNM was retrospectively analyzed according to the clinicopathological features. For multifocal lesions, total tumor diameter (TTD) was calculated as the sum of the maximal diameter of each lesion. Last, a meta-analysis was performed with respect to multifocality and LNM in the PTMCs.

Results

The proportion of LNM was similar between multifocal PTMCs with TTD ≤ 1 cm and unifocal tumors with diameter ≤ 1 cm (37.5 vs. 30 %, P = 0.463). LNM frequency was also similar between multifocal PTMCs with 1 < TTD ≤ 2 cm (TTD greater than 1 cm but less than or equal to 2 cm) and unifocal tumors with 1 < diameter ≤ 2 cm (56.8 vs. 64.9 %, P = 0.330). However, LNM frequency was significantly higher in multifocal PTMCs with TTD > 1 cm than unifocal tumors with diameter ≤ 1 cm (60.4 vs. 30 %, P < 0.001). A meta-analysis of nine publications plus our own data with a total 1,586 PTMCs demonstrated that multifocality was significantly associated with LNM risk (odds ratio 1.9, 95 % confidence interval 1.5–2.4).

Conclusions

Multifocal PTMC with TTD > 1 cm has a similar risk of LNM as a clinical papillary cancer. Routine central neck dissection is recommended in this subgroup of patients.

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Authors and Affiliations

  1. Department of General Surgery, Affiliated Union Hospital, Tongji Medical College, Wuhan, China

    Qunzi Zhao MD, Jie Ming MD, Chunping Liu MD, Lan Shi MD & Tao Huang MD, PhD

  2. Department of Pathology, Affiliated Union Hospital, Tongji Medical College, Wuhan, China

    Xia Xu MD & Xiu Nie MD

Authors
  1. Qunzi Zhao MD
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  2. Jie Ming MD
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  3. Chunping Liu MD
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  4. Lan Shi MD
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  5. Xia Xu MD
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  6. Xiu Nie MD
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  7. Tao Huang MD, PhD
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Corresponding author

Correspondence to Tao Huang MD, PhD.

Additional information

Qunzi Zhao and Jie Ming contributed equally to this article.

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Zhao, Q., Ming, J., Liu, C. et al. Multifocality and Total Tumor Diameter Predict Central Neck Lymph Node Metastases in Papillary Thyroid Microcarcinoma. Ann Surg Oncol 20, 746–752 (2013). https://doi.org/10.1245/s10434-012-2654-2

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  • DOI: https://doi.org/10.1245/s10434-012-2654-2

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