Abstract
BackgroundGastric cancer is more common in men than in women, but underlying reasons have not been completely understood. This study aimed to assess patterns of the sex difference in the incidence of gastric cancer in the United States.MethodsUsing data from 13 cancer registries in the Surveillance, Epidemiology, and End Results Program, we analyzed the age-specific sex difference in the incidence of gastric cancer by ethnicity, anatomic site and histological type in the United States during 1992–2014. We assessed the temporal trends in the sex differences in the incidence of gastric cancer during the study period.ResultsThe male-to-female incidence ratio of cardia cancer increased with age until peaking at ages 55–69 years and decreased thereafter, while the ratio for non-cardia gastric cancer increased with age before ages < 60 years and remained stable onwards. The age-specific patterns in the sex difference of gastric cancer incidence varied between intestinal and diffuse histological types. The sex difference in the incidence of cardia cancer remained relatively stable except for that the absolute difference between the sexes in whites decreased on average by 0.8% per year from 1992 to 2014. The absolute incidence difference between the sexes in non-cardia gastric cancer decreased over time in whites, blacks, and Asian and Pacific islanders by approximately 4% per year. The male-to-female incidence ratio of non-cardia gastric cancer decreased over time in whites and blacks, but remained relatively stable in Asian and Pacific islanders.ConclusionsBoth extrinsic and intrinsic factors may have contributed to the sex difference in gastric cancer. Sex hormones may play a role in the development of cardia cancer and intestinal type of gastric cancer.
Highlights
Gastric cancer is more common in men than in women, but underlying reasons have not been com‐ pletely understood
This study included a total of 18,997 new cases of cardia cancer (14,614 males and 4383 females) and 38,537 new cases of non-cardia gastric cancer (21,134 males and 17,403 females), with the male-to-female ratios in agestandardized incidence rate of 4.2 for cardia cancer and 1.6 for non-cardia gastric cancer
The absolute incidence difference between the sexes in non-cardia gastric cancer decreased over time in whites, blacks, and Asian and Pacific islanders by approximately 4% per year
Summary
Gastric cancer is more common in men than in women, but underlying reasons have not been com‐ pletely understood. This study aimed to assess patterns of the sex difference in the incidence of gastric cancer in the United States. Gastric cancer varies greatly in epidemiology and risk factors across anatomic subsite and histological types [2, 3]. Yao et al BMC Gastroenterol (2020) 20:418 Both cardia and non-cardia gastric cancers have higher incidence in men than in women, and the sex difference is greater in cardia cancer [5]. The sex difference in gastric cancer may be partially explained by a higher exposure prevalence of certain risk factors, e.g., tobacco smoking and H. pylori infection, in men than in women. Existing epidemiological evidence remains limited and inconclusive [2, 3]
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