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Signet-ring cell carcinoma in gastric biopsies: expecting the unexpected
  1. Christopher P Golembeski1,
  2. Robert Maximilian Genta2,3
  1. 1Miraca Life Sciences Research Institute, Irving, Texas, USA
  2. 2Department of Pathology, Miraca Life Sciences Research Institute, Irving, Texas, USA
  3. 3Department of Pathology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, USA
  1. Correspondence to Dr Robert Maximilian Genta, Miraca Life Sciences, 6655 N. MacArthur Blvd., Irving, TX 75039, USA; robert.genta{at}utsouthwestern.edu

Abstract

Aims This study was designed to establish the relative prevalence of intestinal-type and signet-ring carcinoma in gastric biopsy specimens from ambulatory patients, to determine the percentage of signet-ring carcinomas that could be expected based on the available clinical and endoscopic information, and to estimate the likelihood of missing a tumour.

Methods We extracted data of all patients with a diagnosis of primary gastric carcinoma from a national pathology database. We then reviewed clinical information and original slides, classified tumours as intestinal or signet-ring-type, and categorised the latter as ‘unexpected’ (no alarming symptoms, no mention of suspicious lesions) or ‘expected’ (clinical or endoscopic information suggestive of tumour). Unexpected signet-ring carcinomas were categorised as ‘obvious’ or ‘challenging’ (rare signet-ring cells; immunohistochemical stains used to confirm the nature of the infiltrates).

Results There were 310 109 patients with gastric biopsies; 615 patients had primary gastric carcinoma (359 intestinal and 256 signet-ring-type). Gastric cancer was more common in men (OR 2.54; 95% CI 2.05 to 3.14; p<.0001) for intestinal-type and (OR 1.90; 95% CI 1.48 to 2.42; p<0.0001) for signet-ring cell type). Intestinal-type carcinoma occurred in older patients than signet-ring-type (median age 74 vs 65 years, p<0.001). There were 196 expected and 60 unexpected signet-ring carcinomas; 47 of the 60 unexpected cases were histopathologically obvious. Thus, only 13 signet-ring carcinomas (1 in 25 000 gastric biopsy sets) were truly unexpected.

Conclusions Signet-ring carcinoma is a rare finding in gastric biopsy specimens from ambulatory patients; routine due diligence and the clinical/endoscopic information provided are usually adequate to raise pathologists’ index of suspicion.

  • Gastric Cancer
  • Gastric Pathology
  • Stomach

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