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2015 ; 8
(7
): 7988-97
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Cytologic, clinicopathologic, and molecular features of papillary thyroid
carcinoma with prominent hobnail features: 10 case reports and systematic
literature review
#MMPMID26339365
Lee YS
; Kim Y
; Jeon S
; Bae JS
; Jung SL
; Jung CK
Int J Clin Exp Pathol
2015[]; 8
(7
): 7988-97
PMID26339365
show ga
The hobnail variant of papillary thyroid carcinoma (PTC) is a rare, aggressive
variant in which > 30% of the tumor cells have hobnail features. The clinical
behavior and pathologic characteristics of these tumors are still unclear due to
the rarity of the entity. The present study aimed to investigate cytologic,
clinical, pathological, and molecular features of the hobnail variant from our
data and from the literature. We retrospectively retrieved 10 cases of hobnail
variant from 2,904 consecutive PTC patients. Cytologic and histopathologic slides
from those 10 patients were reviewed. We performed molecular analysis for BRAF,
ALK, and TERT promoter mutations on paraffin blocks from surgical specimens, and
further analyzed the clinicopathologic characteristics of all case reports
published in the literature until now. Cytologically, all tumors were
characterized by single cells with eccentric nuclei and tapering cytoplasm
(comet-like cells), and syncytial or micropapillary clusters with apically placed
nuclei resulting in a hobnail appearance in both conventional smears and
liquid-based cytology. The BRAF V600E mutation was found in 8 cases (80%) whereas
no cases had ALK fusion or TERT promoter mutations. In the literature review of
55 patients including our cases, most patients presented with advanced stage
cancer, and disease-specific survival rates were 83%, 71%, and 54% at 5, 10, and
20 years after the initial surgery, respectively. Characteristic cytologic
features can allow a preoperative diagnosis of the hobnail variant of PTC based
on cytology specimens. Further studies should be performed to identify the
molecular genetics of the variant.