Different qualifiers of AUS/FLUS thyroid FNA have distinct BRAF, RAS, RET/PTC, and PAX8/PPARg alterations.

Abstract:

BACKGROUND:The Bethesda System for Reporting Thyroid Cytopathology category of atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) includes fine-needle aspiration (FNA) specimens that cannot straightforwardly be classified as benign or malignant. To determine whether morphological subcategorization based on atypia qualifiers and molecular testing could improve malignancy risk stratification of AUS/FLUS patients, this study assessed the correlation between these qualifiers and the molecular alterations commonly harbored by thyroid neoplasms. METHODS:A total of 162 AUS/FLUS cases were subcategorized by atypia qualifiers (Hürthle cell changes, architectural atypia, and cytologic atypia [CyA]) and were tested for BRAF, N-H-KRAS, RET/PTC, and paired box 8 (PAX8)/peroxisome proliferator activated receptor γ (PPARg) mutations. RESULTS:CyA was observed more frequently in mutation-positive AUS/FLUS (14 of 37 [37.84%]) than mutation-negative AUS/FLUS (20 of 125 [16.00%]; P < .0084), and it specifically harbored the BRAFV600E point mutation. Malignancy was confirmed in the available follow-up. Conversely, although RAS was the most frequent mutation identified in AUS/FLUS FNA specimens (26 of 37 cases [70.27%]; P < .0001), it was distributed across various AUS/FLUS subcategories and was not significantly associated with a specific atypia qualifier or malignant outcome according to the available follow-up. Rearrangements of both RET/PTC (n = 1) and PAX8/PPARg (n = 3) were rarely retrieved in the FNA samples. CONCLUSIONS:BRAF and RAS mutations are associated with different AUS/FLUS qualifiers and hence have different risks of malignancy. Consequently, a hybrid molecular and morphological subcategorization system could improve the malignancy risk stratification of thyroid FNA samples diagnosed as AUS/FLUS. Cancer Cytopathol 2018;126:317-25. © 2018 American Cancer Society.

journal_name

Cancer Cytopathol

journal_title

Cancer cytopathology

authors

Bellevicine C,Sgariglia R,Migliatico I,Vigliar E,D'Anna M,Nacchio MA,Serra N,Malapelle U,Bongiovanni M,Troncone G

doi

10.1002/cncy.21984

subject

Has Abstract

pub_date

2018-05-01 00:00:00

pages

317-325

issue

5

eissn

1934-662X

issn

1934-6638

journal_volume

126

pub_type

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