{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T11:31:10Z","timestamp":1791199870919,"version":"4.2.0"},"reference-count":49,"publisher":"American Medical Association (AMA)","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Netw Open"],"abstract":"Importance<\/jats:title>The E-cadherin gene, CDH1<\/jats:italic>, and the \u03b1-E-catenin gene, CTNNA1<\/jats:italic>, were previously identified as hereditary diffuse gastric cancer (HDGC) susceptibility genes, explaining 25% to 50% of HDGC cases. The genetic basis underlying disease susceptibility in the remaining 50% to 75% of patients with HDGC is still unknown.<\/jats:p><\/jats:sec>Objective<\/jats:title>To assess the incidence rate of CDH1<\/jats:italic> germline alterations in HDGC, identify new susceptibility genes that can be used for screening of HDGC, and provide a genetic landscape for HDGC.<\/jats:p><\/jats:sec>Design, Setting, and Participants<\/jats:title>This cohort study conducted retrospective whole-exome and targeted sequencing of 284 leukocyte samples and 186 paired tumor samples from Chinese patients with HDGC over a long follow-up period (median, 21.7 [range, 0.6-185.9] months). Among 10 431 patients diagnosed with gastric cancer between January 1, 2002, and August 31, 2018, 284 patients who met the criteria for HDGC were included. Data were analyzed from August 1 to 30, 2020.<\/jats:p><\/jats:sec>Main Outcomes and Measures<\/jats:title>Incidence rate of CDH1<\/jats:italic> germline alterations, identification of new HDGC susceptibility genes, and genetic landscape of HDGC.<\/jats:p><\/jats:sec>Results<\/jats:title>Among 284 Chinese patients, 161 (56.7%) were female, and the median age was 35 (range, 20-75) years. The frequency of CDH1<\/jats:italic> germline alterations was 2.8%, whereas the frequency of CDH1<\/jats:italic> somatic alterations was 25.3%. The genes with the highest incidence (&amp;gt;10%) of private germline alterations (including insertions and deletions) in the HDGC cohort were MUC4<\/jats:italic>, ABCA13<\/jats:italic>, ZNF469<\/jats:italic>, FCGBP<\/jats:italic>, IGFN1<\/jats:italic>, RNF213<\/jats:italic>, and SSPO<\/jats:italic>, whereas previously reported germline alterations of CTNNA1<\/jats:italic>, BRCA2<\/jats:italic>, STK11<\/jats:italic>, PRSS1<\/jats:italic>, ATM<\/jats:italic>, MSR1<\/jats:italic>, PALB2<\/jats:italic>, BRCA1<\/jats:italic>, and RAD51C<\/jats:italic> were observed at low frequencies (median, 4 [range, 1-12] cases). Furthermore, enrichment of the somatic variant signature of exposure to aflatoxin suggested potential interaction between genetics and environment in HDGC. Double-hit events in genes such as CACNA1D<\/jats:italic> were observed, which suggested that these events might serve as important mechanisms for HDGC tumorigenesis. In addition, germline variants of FSIP2<\/jats:italic>, HSPG2<\/jats:italic>, and NCKAP5<\/jats:italic> and somatic alterations of FGFR3<\/jats:italic>, ASPSCR1<\/jats:italic>, CIC<\/jats:italic>, DGCR8<\/jats:italic>, and LZTR1<\/jats:italic> were associated with poor overall survival among patients with HDGC.<\/jats:p><\/jats:sec>Conclusions and Relevance<\/jats:title>This study provided a genetic landscape for HDGC. The study\u2019s findings challenged the previously reported high germline alteration rate of CDH1<\/jats:italic> in HDGC and identified new potential susceptibility genes. Analyses of variant signatures and double-hit events revealed potentially important mechanisms for HDGC tumorigenesis. Findings from the present study may provide helpful information for further investigations of HDGC.<\/jats:p><\/jats:sec>","DOI":"10.1001\/jamanetworkopen.2022.45836","type":"journal-article","created":{"date-parts":[[2022,12,9]],"date-time":"2022-12-09T16:30:53Z","timestamp":1670603453000},"page":"e2245836","source":"Crossref","is-referenced-by-count":24,"title":["Whole-Exome Sequencing Among Chinese Patients With Hereditary Diffuse Gastric Cancer"],"prefix":"10.1001","volume":"5","author":[{"given":"Ze-Xian","family":"Liu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao-Long","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, 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