Abstract
Background
Epstein–Barr virus (EBV) positivity is associated with better gastric cancer prognosis and is found in a relatively fixed 9% of tumors worldwide.
Aim
We aimed to examine the EBV status of gastric adenocarcinomas in a very high-incidence population and to compare prevalence between cardia and non-cardia anatomic subsites.
Methods
We evaluated 1035 adult gastric adenocarcinoma cases presenting during 1997–2005 to the Shanxi Cancer Hospital in Taiyuan, Shanxi Province, China. EBV-encoded RNA was detected in alcohol-fixed paraffin-embedded tumor specimens by in situ hybridization. Associations were assessed in case–case comparisons using the Chi-squared test for categorical variables and the Mann–Whitney U test for continuous variables, with p values < 0.05 considered statistically significant. Adjusted odds ratios were calculated using logistic regression, and mortality hazard ratios (HRs) were estimated by Cox proportional hazards regression.
Results
Sixty-four percent of the evaluated cancers were found in the cardia. Cardia tumor localization was associated with male sex, advanced primary tumor stage, better differentiated histology, and intestinal-type Lauren classification. Four percent of the non-cardia and only 0.9% of cardia cancers were EBV-positive. EBV positivity was associated with better overall survival (adjusted HR 0.30, 95% CI 0.14–0.63).
Conclusions
Our study highlights unusually low EBV prevalence in gastric adenocarcinoma among a high-incidence population, particularly for cardia cancers. These findings suggest a unique risk factor profile for the high incidence of gastric cancer in this population.
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Acknowledgments
The authors would like to acknowledge the assistance of staff members of the Shanxi Cancer Hospital.
Funding
This study was funded by the Intramural Research Program of the Division of Cancer Epidemiology and Genetics, United States National Cancer Institute.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by John G. Aversa, Minkyo Song, Stephen M. Hewitt, Margaret L. Gulley, Sanford Dawsey, Phillip R. Taylor, and Charles S. Rabkin. The first draft of the manuscript was written by John G. Aversa, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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All procedures performed were in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The study was approved by the institutional review boards of the Shanxi Cancer Hospital, the National Cancer Institute, and the University of North Carolina.
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Informed consent to be included in the study was obtained from all individual participants included in the study.
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Aversa, J.G., Song, M., Hu, N. et al. Low Epstein–Barr Virus Prevalence in Cardia Gastric Cancer Among a High-Incidence Chinese Population. Dig Dis Sci 66, 1220–1226 (2021). https://doi.org/10.1007/s10620-020-06288-1
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DOI: https://doi.org/10.1007/s10620-020-06288-1