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Related Concept Videos

Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...

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Lymphoid enhancer-binding factor 1 (LEF1) immunostaining as a surrogate for β-catenin (CTNNB1) mutations.

Ekkehard Hewer1,2, Pascal David Fischer2, Erik Vassella2

  • 1Institute of Pathology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland ekkehard.hewer@unil.ch m.dettmer@klinikum-stuttgart.de.

Journal of Clinical Pathology
|December 9, 2024
PubMed
Summary

Lymphoid enhancer-binding factor 1 (LEF1) immunostaining is a more accurate and easier-to-interpret surrogate for CTNNB1 mutations than beta-catenin immunohistochemistry. This finding aids in diagnosing various tumors driven by CTNNB1 mutations.

Keywords:
CARCINOMAENDOMETRIUMGenes, NeoplasmIMMUNOHISTOCHEMISTRY

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Area of Science:

  • Oncology
  • Molecular Pathology
  • Cancer Diagnostics

Background:

  • Mutations in the beta-catenin (CTNNB1) gene activate WNT signaling, serving as a hallmark for tumors like desmoid-type fibromatosis and endometrioid carcinoma.
  • Beta-catenin immunohistochemistry is a common diagnostic tool for CTNNB1 mutations, but its interpretation can be challenging due to focal nuclear translocation and overlap with membranous staining.

Purpose of the Study:

  • To evaluate lymphoid enhancer-binding factor 1 (LEF1) immunostaining as a potential surrogate marker for CTNNB1 mutations.
  • To compare the diagnostic accuracy and interpretability of LEF1 immunostaining against beta-catenin immunohistochemistry.

Main Methods:

  • Examined LEF1 immunostaining in a cohort of 130 endometrial carcinomas with known CTNNB1 mutation status.
  • Assessed the accuracy, sensitivity, and specificity of LEF1 and beta-catenin in predicting CTNNB1 mutation status.
  • Evaluated the interpretability of LEF1 versus beta-catenin immunostaining across various tumor types.

Main Results:

  • LEF1 immunostaining demonstrated 85% accuracy in predicting CTNNB1 mutations in endometrial carcinomas, outperforming beta-catenin (76% accuracy).
  • LEF1 showed higher specificity (90%) compared to beta-catenin (77%) for detecting CTNNB1 mutations.
  • Diffuse and strong LEF1 expression was observed in 77% of tumors with CTNNB1 mutations, and LEF1 staining was easier to interpret in 54% of cases.

Conclusions:

  • LEF1 immunostaining is a valuable and accurate surrogate marker for CTNNB1 mutations.
  • LEF1 immunostaining complements beta-catenin immunohistochemistry and serves as a superior single marker for diagnosing CTNNB1-driven tumors.