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Abdominal and pelvic\u00a0enhanced\u00a0CT before and after chemotherapy was independently analyzed by two radiologists. The PCI of peritoneal metastasis in gastric cancer was evaluated according to the Sugarbaker classification, considering the size and distribution of the lesions using CT. Then we evaluated the prognostic performance of PCI based on CT, clinical characteristics, and imaging findings for survival analysis using multivariate Cox proportional hazard regression.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The PCI change ratio based on CT after treatment (\u0394PCI), therapy lines, and change in grade of ascites were independent factors that were associated with overall survival (OS). The area under the curve (AUC) value of \u0394PCI for predicting OS with 0.773 was higher than that of RECIST 1.1 with 0.661 (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05). Patients with \u0394PCI less than\u2009\u221215% had significantly longer OS.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>CT analysis after chemotherapy could predict OS in patients with GCPM. The CT-PCI change ratio could contribute to the determination of an appropriate strategy for gastric cancer patients with peritoneal metastasis.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00432-024-05707-4","type":"journal-article","created":{"date-parts":[[2024,4,30]],"date-time":"2024-04-30T10:01:58Z","timestamp":1714471318000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Dynamic change in the peritoneal cancer index based on CT after chemotherapy in the overall survival prediction of gastric cancer patients with peritoneal metastasis"],"prefix":"10.1007","volume":"150","author":[{"given":"Yi-Yuan","family":"Wei","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie-Yuan","family":"Cai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lin-Lin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan-Ling","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiao-Ting","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiao-Tian","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan-Jie","family":"Shi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lei","family":"Tang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,4,30]]},"reference":[{"issue":"8","key":"5707_CR1","doi-asserted-by":"publisher","first-page":"1350","DOI":"10.1002\/jso.25729","volume":"120","author":"CJ Allen","year":"2019","unstructured":"Allen CJ, Newhook TE, Vreeland TJ, Das P, Minsky BD, Blum M, Song S, Ajani J, Ikoma N, Mansfield PF, Roy-Chowdhuri S, Badgwell BD (2019) Yield of peritoneal cytology in staging patients with gastric and gastroesophageal cancer. 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This study protocol was approved by the Ethics Committee of Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute (No. 2020KT153), due to the retrospective nature of the study, the need for informed consent was waived by the Ethics Committee of Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University Cancer Hospital & Institute. The authors are accountable for all aspects of the work in to ensure that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"All authors consent to publish this article.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}}],"article-number":"222"}}