The utility of P53 immunohistochemistry in the diagnosis of Barrett's oesophagus with indefinite for dysplasia

Wladyslaw Januszewicz, Nastazja D. Pilonis, Tarek Sawas, Richard Phillips, Maria O'Donovan, Ahmad Miremadi, Shalini Malhotra, Monika Tripathi, Adrienn Blasko, David A. Katzka, Rebecca C. Fitzgerald, Massimiliano di Pietro

Research output: Contribution to journalArticlepeer-review

Abstract

Aims: Barrett's oesophagus with indefinite for dysplasia (BE-IND) is a subjective diagnosis with a low interobserver agreement (IOA) among pathologists and uncertain clinical implications. This study aimed to assess the utility of p53 immunohistochemistry (p53-IHC) in assessing BE-IND specimens. Methods and results: Archive endoscopic biopsies with a BE-IND diagnosis from two academic centres were analysed. First, haematoxylin and eosin-stained slides (H&E) were reviewed by four expert gastrointestinal (GI) pathologists allocated into two groups (A and B). After a washout period of at least 8 weeks, H&E slides were reassessed side-to-side with p53-IHC available. We compared the rate of changed diagnosis and the IOA for all BE grades before and after p53-IHC. We included 216 BE-IND specimens from 185 patients, 44.0 and 32.9% of which were confirmed after H&E slide revision by groups A and B, respectively. More than half the cases were reclassified to a non-dysplastic BE (NDBE), while 5.6% of cases in group A and 7.4% in group B were reclassified to definite dysplasia. The IOA for NDBE, BE-IND, low-grade dysplasia (LGD) and high-grade dysplasia (HGD)/intramucosal cancer (IMC) was 0.31, 0.21, −0.03 and −0.02, respectively. Use of p53-IHC led to a >40% reduction in BE-IND diagnoses (P < 0.001) and increased IOA for all BE grades [κ = 0.46 (NDBE), 0.26 (BE-IND), 0.49 (LGD), 0.35 (HGD/IMC)]. An aberrant p53-IHC pattern significantly increased the likelihood of reclassifying BE-IND to definite dysplasia (odds ratio = 44.3, 95% confidence interval = 18.8–113.0). Conclusion: P53-IHC reduces the rate of BE-IND diagnoses and improves the IOA among pathologists when reporting BE with equivocal epithelial changes.

Original languageEnglish (US)
Pages (from-to)1081-1090
Number of pages10
JournalHistopathology
Volume80
Issue number7
DOIs
StatePublished - Jun 2022
Externally publishedYes

Keywords

  • biomarkers
  • clinical pathology
  • observer variations
  • oesophageal neoplasms

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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