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Risk stratification for gastric cancer after Helicobacter pylori eradication: A population‐based study on Matsu Islands
Author(s) -
Chiang TsungHsien,
Maeda Masahiro,
Yamada Harumi,
Chan ChangChuan,
Chen Sam LiSheng,
Chiu Sherry YuehHsia,
Chen YenNien,
Chou YiHsuan,
Shieh ChunFu,
Liu ChengYing,
Chiu HanMo,
Chiang Hung,
Shun ChiaTung,
Lin MingWei,
Wu MingShiang,
Lin JawTown,
Chen HsiuHsi,
Ushijima Toshikazu,
Graham David Y.,
Lee YiChia
Publication year - 2021
Publication title -
journal of gastroenterology and hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.214
H-Index - 130
eISSN - 1440-1746
pISSN - 0815-9319
DOI - 10.1111/jgh.15187
Subject(s) - medicine , atrophic gastritis , helicobacter pylori , gastroenterology , cancer , population , gastrin , gastritis , serology , pepsin , confidence interval , immunology , antibody , biology , biochemistry , enzyme , environmental health , secretion
Background and Aim The reliable method to stratify the gastric cancer risk after Helicobacter pylori eradication remains an elusive goal. Methods Mass eradication of H. pylori began in 2004 in a high‐risk population. After eradication, a screening program involving first‐stage serological tests (pepsinogen‐I, pepsinogen‐II, H. pylori immunoglobin G, and gastrin‐17) and second‐stage endoscopic examination was launched in 2015–2018. Index lesions included gastric cancer or extensive premalignant lesions. We evaluated the performance of the serological tests to “rule in” and “rule out” the risk based on positive and negative likelihood ratios, respectively. The methylation levels of microRNA‐124a‐3 in the stomach were measured to indicate genetic damage. Results Among 6512 invited subjects, 3895 (59.6%) participated. Both gastrin‐17 and pepsinogen tests were normal in 3560 (91.4%) subjects; 206 (5.3%) gastrin‐17 and 129 (3.3%) pepsinogen tests were abnormal. Years after eradication, the severity of gastritis had fallen greatly, and extensive premalignant lesions or gastric cancer frequently occurred in newly non‐atrophic‐appearing mucosa. Pepsinogen testing could moderately predict atrophic gastritis (positive likelihood ratio: 4.11 [95% confidence interval: 2.92–5.77]; negative likelihood ratio: 0.14 [0.10–0.19]). Gastrin‐17 was not useful (0.66 and 1.20, respectively). However, pepsinogen testing poorly predicted the index lesions (2.04 [1.21–3.42] and 0.57 [0.34–0.95]). DNA methylation levels in the post‐eradication mucosa were more discriminative for predicting index lesions (3.89 [2.32–6.54] and 0.25 [0.15–0.42]). Conclusions After eradication, pepsinogen false‐negative results become more frequent because histology is improved but genetic damage may persist. Direct testing for genetic damage offers better discrimination.