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Pleural mesothelioma classification update.

Mary Beth Beasley1, Francoise Galateau-Salle2, Sanja Dacic3

  • 1Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

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Summary
This summary is machine-generated.

The 2015 WHO classification of pleural mesothelioma needs refinement. Upcoming changes include mesothelioma in situ and improved diagnostic markers like BAP1 and CDKN2A/MTAP for better accuracy.

Keywords:
Histologic classificationMesotheliomaPleura

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Area of Science:

  • Pathology
  • Oncology
  • Genomics

Background:

  • The current 2015 WHO classification categorizes pleural mesothelioma into epithelioid, sarcomatoid, and biphasic subtypes.
  • Recent genomic findings highlight the need for a more detailed and clinically relevant classification system.
  • Mesothelioma diagnosis is challenging due to tumor rarity and overlapping features with other cancers, necessitating precise immunohistochemical analysis.

Purpose of the Study:

  • To review proposed updates to the histologic classification of pleural mesothelioma.
  • To discuss differential diagnoses for pleural mesothelioma.
  • To emphasize the importance of ancillary diagnostic studies in mesothelioma diagnosis.

Main Methods:

  • Review of recent genomic data and proposed changes in mesothelioma classification.
  • Discussion of diagnostic immunohistochemical markers, including BAP1 and CDKN2A/MTAP.
  • Analysis of differential diagnostic considerations and the role of ancillary studies.

Main Results:

  • Genomic data supports a more granular classification beyond current subtypes.
  • BAP1 and CDKN2A/MTAP enhance diagnostic sensitivity, particularly for epithelioid mesothelioma in effusion specimens.
  • Mesothelioma in situ is a significant addition to the forthcoming WHO classification.

Conclusions:

  • The classification of pleural mesothelioma is evolving, driven by genomic insights.
  • Immunohistochemistry, especially BAP1 and CDKN2A/MTAP, is crucial for accurate mesothelioma diagnosis.
  • The inclusion of mesothelioma in situ marks a key advancement in diagnostic categorization.