{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T22:52:37Z","timestamp":1775688757433,"version":"3.50.1"},"reference-count":17,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2023,4,23]],"date-time":"2023-04-23T00:00:00Z","timestamp":1682208000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Annals of Gastroent Surgery"],"published-print":{"date-parts":[[2023,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To establish a new Japanese classification of synchronous peritoneal metastases from colorectal cancer.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This multi\u2010institutional, prospective, observational study enrolled patients who underwent surgery for colorectal cancer with synchronous peritoneal metastases. Overall survival rates were compared according to the various models using objective indicators. Each model was evaluated by Akaike's information criterion (AIC). The region of peritoneal metastases was evaluated by the peritoneal cancer index (PCI).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Between October 2012 and December 2016, 150 patients were enrolled. The AIC of the present Japanese classification was 1020.7. P1 metastasis was defined as confined to two regions. The minimum AIC was obtained with the cutoff number of 10 or less for P2 metastasis and 11 or more for P3 metastasis. As for size, the best discrimination ability between P2 and P3 metastasis was obtained with a cutoff value of 3\u2009cm. The AIC of the proposed classification was 1014.7. The classification was as follows: P0, no peritoneal metastases; P1, metastases localized to adjacent peritoneum (within two regions of PCI); P2, metastases to distant peritoneum, number \u226410 and size \u22643\u2009cm; P3, metastases to distant peritoneum, number\u2009\u226511 or size &gt;3\u2009cm; P3a, metastases to distant peritoneum, number \u226511 and size \u22643\u2009cm, or number \u226410 and size &gt;3\u2009cm; P3b, metastases to distant peritoneum, number\u2009\u226511 and size &gt;3\u2009cm.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This objective classification could improve the ability to discriminate prognosis in patients with synchronous peritoneal metastases from colorectal cancer.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ags3.12679","type":"journal-article","created":{"date-parts":[[2023,4,24]],"date-time":"2023-04-24T05:41:21Z","timestamp":1682314881000},"page":"765-771","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A proposed new Japanese classification of synchronous peritoneal metastases from colorectal cancer: A multi\u2010institutional, prospective, observational study conducted by the Japanese Society for Cancer of the Colon and Rectum"],"prefix":"10.1002","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4381-0439","authenticated-orcid":false,"given":"Hirotoshi","family":"Kobayashi","sequence":"first","affiliation":[{"name":"Department of Surgery Tokyo Metropolitan Hiroo Hospital  Tokyo Japan"},{"name":"Department of Surgery Teikyo University Hospital  Mizonokuchi Kanagawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenjiro","family":"Kotake","sequence":"additional","affiliation":[{"name":"Department of Surgery Sano City Hospital  Tochigi Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9306-493X","authenticated-orcid":false,"given":"Masayasu","family":"Kawasaki","sequence":"additional","affiliation":[{"name":"Department of Surgery Bell Land General Hospital  Sakai Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yukihide","family":"Kanemitsu","sequence":"additional","affiliation":[{"name":"Department of Colorectal Surgery National Cancer Center Hospital  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yusuke","family":"Kinugasa","sequence":"additional","affiliation":[{"name":"Department of Gastrointestinal Surgery Tokyo Medical and Dental University  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8600-1199","authenticated-orcid":false,"given":"Hideki","family":"Ueno","sequence":"additional","affiliation":[{"name":"Department of Surgery National Defense Medical College  Tokorozawa Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kotaro","family":"Maeda","sequence":"additional","affiliation":[{"name":"International Medical Center Fujita Health University Hospital  Toyoake Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takeshi","family":"Suto","sequence":"additional","affiliation":[{"name":"Department of Gastroenterological Surgery Yamagata Prefectural Central Hospital  Yamagata Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michio","family":"Itabashi","sequence":"additional","affiliation":[{"name":"Department of Surgery Institute of Gastroenterology, Tokyo Women's Medical University  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kimihiko","family":"Funahashi","sequence":"additional","affiliation":[{"name":"Department of General and Gastroenterological Surgery Toho University Omori Medical Center  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Heita","family":"Ozawa","sequence":"additional","affiliation":[{"name":"Department of Surgery Tochigi Cancer Center  Utsunomiya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fumikazu","family":"Koyama","sequence":"additional","affiliation":[{"name":"Department of Surgery Nara Medical University  Kashihara Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shingo","family":"Noura","sequence":"additional","affiliation":[{"name":"Department of Surgery Osaka Rosai Hospital  Sakai Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideyuki","family":"Ishida","sequence":"additional","affiliation":[{"name":"Department of Digestive Tract and General Surgery Saitama Medical Center, Saitama Medical University  Kawagoe Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masayuki","family":"Ohue","sequence":"additional","affiliation":[{"name":"Department of Gastroenterological Surgery Osaka International Cancer Institute  Osaka Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomomichi","family":"Kiyomatsu","sequence":"additional","affiliation":[{"name":"Department of Colorectal Surgery National Center for Global Health and Medicine  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Soichiro","family":"Ishihara","sequence":"additional","affiliation":[{"name":"Department of Surgical Oncology The University of Tokyo Hospital  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keiji","family":"Koda","sequence":"additional","affiliation":[{"name":"Department of Surgery Teikyo University Chiba Medical Center  Ichihara City Chiba Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3474-2550","authenticated-orcid":false,"given":"Hideo","family":"Baba","sequence":"additional","affiliation":[{"name":"Department of Gastroenterological Surgery Graduate School of Medical Sciences, Kumamoto University  Kumamoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4336-6937","authenticated-orcid":false,"given":"Kenji","family":"Kawada","sequence":"additional","affiliation":[{"name":"Department of Gastrointestinal Surgery Graduate School of Medicine, Kyoto University  Kyoto Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yojiro","family":"Hashiguchi","sequence":"additional","affiliation":[{"name":"Department of Surgery Teikyo University School of Medicine  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takanori","family":"Goi","sequence":"additional","affiliation":[{"name":"First Department of Surgery University of Fukui  Fukui Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1301-3268","authenticated-orcid":false,"given":"Yuji","family":"Toiyama","sequence":"additional","affiliation":[{"name":"Division of Reparative Medicine, Department of Gastrointestinal and Pediatric Surgery, Institute of Life Sciences Mie University Graduate School of Medicine  Tsu Mie Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naohiro","family":"Tomita","sequence":"additional","affiliation":[{"name":"Division of Lower Gastrointestinal Surgery, Department of Gastroenterological Surgery Hyogo Medical University  Nishinomiya Hyogo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eiji","family":"Sunami","sequence":"additional","affiliation":[{"name":"Department of Surgery Kyorin University School of Medicine  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshito","family":"Akagi","sequence":"additional","affiliation":[{"name":"Department of Surgery Kurume University School of Medicine  Kurume Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Department of Surgery Gastroenterological Center, Yokohama City University Medical Center  Yokohama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenichi","family":"Hakamada","sequence":"additional","affiliation":[{"name":"Department of Gastroenterological Surgery Hirosaki University Graduate School of Medicine  Aomori Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Goro","family":"Nakayama","sequence":"additional","affiliation":[{"name":"Department of Gastroenterological Surgery (Surgery II) Nagoya University Graduate School of Medicine  Nagoya Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenichi","family":"Sugihara","sequence":"additional","affiliation":[{"name":"Tokyo Medical and Dental University  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoichi","family":"Ajioka","sequence":"additional","affiliation":[{"name":"Division of Molecular and Diagnostic Pathology, Graduate School of Medical and Dental Sciences Niigata University  Niigata Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,4,23]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.3322\/caac.21708"},{"key":"e_1_2_8_3_1","unstructured":"Current Cancer Statistics in Japan.Colorectal cancer is the second leading cause of cancer death in Japan[cited 2022 Nov 24]. Available from:https:\/\/ganjoho.jp\/reg_stat\/statistics\/stat\/summary.html"},{"key":"e_1_2_8_4_1","first-page":"S32","article-title":"Changes in colorectal cancer during a 20\u2010year period: an extended report from the multi\u2010institutional registry of large bowel cancer, Japan","volume":"46","author":"Kotake K","year":"2003","journal-title":"Dis Colon Rectum"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/PL00012102"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1159\/000320460"},{"key":"e_1_2_8_7_1","volume-title":"AJCC cancer staging manual","author":"American Joint Committee on Cancer","year":"2017"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.23922\/jarc.2019-018"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1007\/s002800051093"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00535-013-0820-3"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10147-012-0505-6"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1093\/jjco\/hyu114"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/ags3.12405"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.23922\/jarc.2020-033"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10147-019-01485-z"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1200\/JCO.2009.23.9285"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1200\/JCO.2003.04.187"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1470-2045(20)30599-4"}],"container-title":["Annals of Gastroenterological Surgery"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/ags3.12679","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,1]],"date-time":"2023-09-01T10:36:22Z","timestamp":1693564582000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/ags3.12679"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,4,23]]},"references-count":17,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2023,9]]}},"alternative-id":["10.1002\/ags3.12679"],"URL":"https:\/\/doi.org\/10.1002\/ags3.12679","archive":["Portico"],"relation":{},"ISSN":["2475-0328","2475-0328"],"issn-type":[{"value":"2475-0328","type":"print"},{"value":"2475-0328","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,4,23]]},"assertion":[{"value":"2023-02-16","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2023-04-07","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2023-04-23","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}