Korean J Pathol.  2009 Dec;43(6):495-502. 10.4132/KoreanJPathol.2009.43.6.495.

Immunohistochemical and Molecular Characteristics of Follicular Patterned Thyroid Nodules with Incomplete Nuclear Features of Papillary Thyroid Carcinoma

• Min HS
• Choe G
• Cho NY
• Kang GH
• Park SH
• Park SY

• KMID: 1472633
• DOI: http://doi.org/10.4132/KoreanJPathol.2009.43.6.495

Abstract

BACKGROUND
Follicular patterned thyroid nodules with incomplete nuclear features of papillary thyroid carcinoma (FTN-INPTCs) are difficult to diagnose, and their biological behavior and association with follicular variants of PTC (FVPTCs) have not yet been established. The aim of this study is to determine immunohistochemical and molecular characteristics of FTN-INPTCs. METHODS: We investigated immunohistochemical features (galectin-3, HBME-1, CK19, fibronectin-1, CITED1), BRAF V600E mutation and RASSF1A promoter methylation status in 30 FTN-INPTC cases, along with 26 FVPTCs, 21 follicular adenomas (FAs) and 14 nodular hyperplasias (NHs). RESULTS: Expression of galectin-3, HBME-1, CK19 and CITED1 was significantly higher in FTN-INPTCs than in FAs or NHs, but expression of galectin-3, CK19 and fibronectin-1 was lower in FTN-INPTCs than in FVPTCs. The BRAF V600E mutation was not detected in the benign nodules or FTN-INPTCs, whereas 57% of FVPTCs had the mutation. RASSF1A promoter methylation was higher in FTN-INPTCs than in benign nodules but there was no difference between FTN-INPTCs and FVPTCs. CONCLUSIONS: Our results represent the borderline immunohistochemical and molecular characteristics of FTN-INPTC. We conclude that FTN-INPTC is an intermediate lesion between a benign nodule and a FVPTC, and that it is pathogenetically related to FVPTC.

Keyword

Thyroid gland; Thyroid neoplasms; Carcinoma, Papillary

MeSH Terms

Adenoma
Carcinoma
Carcinoma, Papillary
Factor IX
Galectin 3
Hyperplasia
Methylation
Thyroid Gland
Thyroid Neoplasms
Thyroid Nodule
Carcinoma
Factor IX
Galectin 3
Thyroid Neoplasms