Utility of gastric biopsy in diagnosing IgG4-related gastrointestinal disease

Kaori Uchino, Kenji Notohara, Takeshi Uehara, Yasuhiro Kuraishi, Junya Itakura, Akihiro Matsukawa

Research output: Contribution to journalArticlepeer-review

Abstract

The utility of gastric biopsy for diagnosing immunoglobulin (Ig)G4-related gastrointestinal disease (IgG4-GID) remains unclear. Bottom-heavy plasmacytosis (BHP) is a distinct feature of IgG4-GID. To clarify the feasibility of using gastric biopsies to diagnose BHP in IgG4-GID, we analyzed the histological features and immunostaining of gastric biopsy specimens from 31 known IgG4-related disease (IgG4-RD) patients and we assessed the presence of BHP in 1696 consecutive routine gastric biopsies. Cases with both >10 IgG4-positive plasma cells per high-power field and an IgG4/IgG-positive ratio >40% were defined as IgG4-high. Ten of the 31 IgG4-RD patients were concluded to have IgG4-GID, in which IgG4-positive plasma cells were notably detected at the deeper part of the mucosa. Six cases displayed BHP whereas the remaining four cases showed transmural infiltration with concomitant Helicobacter pylori-associated gastritis. In addition to BHP, we identified two unique histologic features for IgG4-GID: plasmacytic aggregation in the muscularis mucosae and permeative plasmacytic infiltration between fundic glands in the non-atrophic mucosa. Six of the routine cases (0.35%) displayed BHP, including a case with IgG4-RD. IgG4-GID can be suspected by the presence of gastric biopsy specimens with characteristic histological features. Such cases are recommended to undergo further examinations to determine whether IgG4-RD is present.

Original languageEnglish
Pages (from-to)124-134
Number of pages11
JournalPathology International
Volume71
Issue number2
DOIs
Publication statusPublished - Feb 2021

Keywords

  • IgG4
  • IgG4-related disease
  • biopsy
  • feasibility studies
  • gastric mucosa
  • gastritis
  • immunoglobulin G4
  • immunohistochemistry
  • plasma cells

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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