Autoimmune Conditions and Gastric Cancer Risk in a Population-based Study in the United Kingdom

John D. Murphy, Shahinaz M. Gadalla, Lesley Anderson, Charles S Rabkin, Chris R Cardwell, Minkyo Song, M. Constanza Camargo* (Corresponding Author)

*Corresponding author for this work

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Abstract

Background: Although overall incidence of gastric cancer is decreasing, incidence has been
increasing among young people in some Western countries. This trend may stem from the
increase in autoimmune conditions.
Methods: Nested case-control study of gastric cancer in UK Clinical Practice Research Datalink. Up to ten cancer-free controls were matched to cases by age and sex. Conditional logistic regression was used to calculate odds ratios (OR) and 95% confidence intervals (CI) for associations between analyzable autoimmune conditions (n=34) and gastric cancer with
Bonferroni correction. We evaluated associations between pernicious anaemia and other
conditions. A meta-analysis of published prospective studies and ours was conducted.
Results: Among 6,586 cases (1,156 cardia, 1,104 non-cardia, and 4,334 overlapping/unspecified
tumours) and 65,687 controls, any autoimmune condition was associated with gastric cancer
(OR=1.10; 95% CI: 1.01–1.20). Individuals with pernicious anaemia had higher gastric cancer
risk than those without (OR=2.75; 2.19-3.44). Among controls, pernicious anaemia was
associated with seven other conditions (OR range: 2.21-29.80). The pooled estimate for any
autoimmune condition and gastric cancer was 1.17 (1.14–1.21; n=47,126 cases).
Conclusion: Autoimmunity increases gastric cancer risk. Some autoimmune conditions may be indirectly associated with gastric cancer via pernicious anaemia. Pernicious anaemia could be considered for gastric cancer risk stratification and screening.
Original languageEnglish
Pages (from-to)138-148
Number of pages11
JournalBritish Journal of Cancer
Volume131
Early online date22 May 2024
DOIs
Publication statusPublished - 27 Jul 2024

Bibliographical note

ACKNOWLEDGMENTS
This study is based in part on data from the Clinical Practice Research Datalink obtained under
license from the UK Medicines and Healthcare Products Regulatory Agency. However, the
interpretation and conclusions contained in this study are those of the authors alone. The authors wish to thank Emily Carver and Michael Curry of IMS, Inc. for their assistance with accessing the data for this study

Data Availability Statement

Access to data from CPRD is subject to a full license agreement containing detailed terms and conditions of use. Anonymised patient datasets can be extracted for researchers against specific study specifications, following protocol approval via CPRD's Research Data Governance Process (https://cprd.com/data-access).

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