Cribriform-Morular Variant of Papillary Thyroid Carcinoma Shows High Ki-67 Labeling Indices, despite Its Excellent Prognosis release_ytfwcx6uafg45mcozvtixhyn5y

by Mitsuyoshi Hirokawa, Katsuya Matsuda, Takumi Kudo, Miyoko Higuchi, Ayana Suzuki, Nami Takada, Masahiro Nakashima, Akira Miyauchi

Abstract

This study aimed to demonstrate that the cribriform-morular variant (CMV) of papillary thyroid carcinoma (PTC) has high Ki-67 labeling indices, despite its excellent prognosis. We examined 21 CMV-PTCs and 5 conventional PTCs (C-PTCs) resected at Kuma Hospital between 2008 and 2018. All of the patients with CMV-PTC were women. Their ages ranged from 17 to 35 years, with a mean of 25.2 years. An immunohistochemical study using β-catenin, estrogen receptor (ER), and Ki-67 was performed. For apoptotic analysis, terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling staining was performed. All CMV-PTCs were encapsulated with thick fibrous connective tissue. Eleven and one CMV-PTCs exhibited capsular invasion and extrathyroidal invasion, respectively. Two patients showed regional nodal metastasis. The Ki-67 labeling index ranged from 4.8 to 36.4% (mean 15.2%). Apoptotic cells were counted, which showed 2-52 positive cells (mean 12.6) per 10 high-power fields. The Ki-67 labeling index was positively correlated with the apoptotic cell count (r = 0.48, p = 0.030). Ki-67 labeling indices of CMV-PTCs were significantly higher than those of C-PTCs (p = 0.0027). Ages and tumor sizes did not have significant correlations with Ki-67 labeling indices or apoptotic cell counts. This study is the first to demonstrate disproportionally high Ki-67 labeling indexes in a large number of CMV-PTC cases, despite the fact that these cases had favorable prognoses. The favorable prognosis of CMV-PTC may be attributable to encapsulation and nuclear ER expression.
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Published in Pathobiology (Basel) by S. Karger AG
ISSN-L 1015-2008
Volume 86
Issue 5-6
Page(s) 1-6
Release Date 2019-09-11
Publisher S. Karger AG
Primary Language en (lookup)

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Type  article-journal
Stage   published
Date   2019-09-11
DOI  10.1159/000501097
PubMed  31509841
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ISSN-L:  1015-2008
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