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HOME > Endocrinol Metab > Volume 24(3); 2009 > Article
Original Article Clinical Differences between Classic Papillary Thyroid Carcinoma and Variants.
Ji Young Park, Ji In Lee, Alice Hyun Kyung Tan, Hye Won Jang, Hyun Won Shin, Young Lyun Oh, Jung Hee Shin, Jung Han Kim, Ji Soo Kim, Young Ik Son, Sun Wook Kim, Jae Hoon Chung
Endocrinology and Metabolism 2009;24(3):165-173
DOI: https://doi.org/10.3803/jkes.2009.24.3.165
Published online: September 1, 2009
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1Division of Endocrinology and Metabolism, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
2Department of Medicine, Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
3Department of Medicine, Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
4Department of Medicine, Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
5Department of Medicine, Otorhinolaryngology-Head & Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
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Abstract

BACKGROUND
The outcomes of papillary thyroid carcinoma (PTC) variants have been described in a limited number of studies. The purpose of this study was to compare patient outcomes of PTC variants with those of patients with classic PTC. METHODS: A single-institution retrospective analysis was performed to review 2,366 patients with classic PTC and 159 patients with PTC variants diagnosed between 1994 and 2004. PTC variant patients were divided into two groups, favorable (n = 119, 119 follicular variants including 14 encapsulated follicular variants) and aggressive (n = 40, including 13 diffuse sclerosing, 11 tall cell, six solid, six oncocytic, and four columnar cell variants). RESULTS: Compared with classic PTC, the favorable and aggressive variants had a significantly larger tumor size (P<0.001). The favorable variants had significantly lower rates of bilaterality, multifocality, extrathyroidal invasion, cervical lymph node metastasis, stage III and IV disease, and greater male to female ratio (P<0.05). In particular, the encapsulated follicular variant showed no bilaterality, multifocality, extrathyroidal invasion, lymph node metastasis, and distant metastasis. However, the disease-specific survival and recurrence-free survival of patients with favorable PTC were not different from the patients with classic PTC. The aggressive variants had significantly higher rates of bilaterality and cervical lymph node metastasis compared to the classic PTC (P<0.05). They had significantly reduced disease-specific survival and recurrence-free survival rates (P<0.01). CONCLUSIONS: Knowledge of the nature of PTC variants, especially aggressive types, is important in predicting patient outcome and providing appropriate treatment. Further study is needed to better understand PTC variants.

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