Journal
DIAGNOSTIC PATHOLOGY
Volume 11, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/s13000-016-0475-5
Keywords
Hepatocellular adenoma; Atypical hepatocellular adenoma; Liver; HCA; b-HCA
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Funding
- Department of Pathology and Cell Biology at Columbia University
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Background: Four subtypes of hepatocellular adenomas (HCA) are recognized: hepatocyte-nuclear-factor-1 alpha mutated (H-HCA), beta-catenin-mutated type with upregulation of glutamine synthetase (b-HCA), inflammatory type (IHCA) with serum-amyloid-A overexpression, and unclassified type. Subtyping may be useful since b-HCA appear to have higher risk of malignant transformation. We sought to apply subtype analysis and assess histological atypia, correlating these with next-generation sequencing analysis. Methods: Twenty-six HCA were stained with serum amyloid A (SAA), liver fatty acid-binding protein (LFABP), glutamine synthetase (GS), and beta-catenin IHC, followed by analysis with a targeted multiplex sequencing panel. Results: By IHC, 4 HCA (15.4 %) were classified as b-HCA, 11 (42.3 %) as IHCA, 9 (34.6 %) as H-HCA, and two (7.7 %) unclassifiable. Eight HCA (30.8 %) showed atypia (3 b-HCA, 4 IHCA and 1 H-HCA). Targeted sequencing confirmed HNF1A mutations in all H-HCA, confirming reliability of LFABP IHC in identifying these lesions. CTNNB1 mutations were detected in 1 of 4 (25 %) of GS/beta-catenin-positive cases, suggesting that positive GS stain does not always correlate with CTNNB1 mutations. Conclusions: Immunohistochemistry does not consistently identify b-HCA. Mutational analysis improves the diagnostic accuracy of beta-catenin-mutated HCA and is an important tool to assess risk of malignancy in HCA.
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