{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,27]],"date-time":"2025-11-27T16:09:06Z","timestamp":1764259746533},"reference-count":29,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2011,6,30]],"date-time":"2011-06-30T00:00:00Z","timestamp":1309392000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["World j. surg."],"published-print":{"date-parts":[[2011,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>This study was intended to compare the prognostic power of the number of positive lymph nodes with that of the lymph node ratio in patients with ampullary carcinoma.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A retrospective analysis was conducted of the medical records of 71 consecutive patients with ampullary carcinoma who underwent pancreaticoduodenectomy with regional lymph node dissection. A total of 2151 lymph nodes were dissected (median: 28\u00a0nodes per patient) and examined histologically. Cutoff points were determined for both the number of positive nodes and the lymph node ratio using \u03c7<jats:sup>2<\/jats:sup> scores calculated with the Cox proportional hazards regression model.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Lymph node metastasis was found in 34 patients. The best cutoff point for the number of positive nodes was identified as three nodes, and that for the lymph node ratio was identified as 10%. Univariate analysis revealed both the number of positive nodes (0, 1\u20133, or \u22654; <jats:italic>P<\/jats:italic> &lt; 0.0001) and the lymph node ratio (0%, 0\u201310%, or &gt;10%; <jats:italic>P<\/jats:italic> &lt; 0.0001) as significant prognostic factors. Multivariate analysis identified the number of positive nodes as an independent prognostic factor (<jats:italic>P<\/jats:italic> &lt; 0.001), whereas the lymph node ratio failed to remain as an independent variable. The cumulative 5\u2010year survival rates were 85% for patients with 0 positive nodes, 63% for patients with 1\u20133 positive nodes, and 0% for patients with \u22654 positive nodes (<jats:italic>P<\/jats:italic> &lt; 0.0001).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The number of positive lymph nodes better predicts the outcome after resection than the lymph node ratio in patients with ampullary carcinoma.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00268-011-1175-7","type":"journal-article","created":{"date-parts":[[2011,6,29]],"date-time":"2011-06-29T19:42:26Z","timestamp":1309376546000},"page":"2118-2124","source":"Crossref","is-referenced-by-count":40,"title":["Assessment of the Nodal Status in Ampullary Carcinoma: The Number of Positive Lymph Nodes Versus the Lymph Node Ratio"],"prefix":"10.1002","volume":"35","author":[{"given":"Jun","family":"Sakata","sequence":"first","affiliation":[{"name":"Division of Digestive and General Surgery Niigata University Graduate School of Medical and Dental Sciences 1\u2010757 Asahimachi\u2010dori, Chuo\u2010ku 951\u20108510 Niigata City Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshio","family":"Shirai","sequence":"additional","affiliation":[{"name":"Division of Digestive and General Surgery Niigata University Graduate School of Medical and Dental Sciences 1\u2010757 Asahimachi\u2010dori, Chuo\u2010ku 951\u20108510 Niigata City Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshifumi","family":"Wakai","sequence":"additional","affiliation":[{"name":"Division of Digestive and General Surgery Niigata University Graduate School of Medical and Dental Sciences 1\u2010757 Asahimachi\u2010dori, Chuo\u2010ku 951\u20108510 Niigata City Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoichi","family":"Ajioka","sequence":"additional","affiliation":[{"name":"Division of Molecular and Diagnostic Pathology Niigata University Graduate School of Medical and Dental Sciences Niigata City Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kouhei","family":"Akazawa","sequence":"additional","affiliation":[{"name":"Department of Medical Informatics Niigata University Medical and Dental Hospital Niigata City Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katsuyoshi","family":"Hatakeyama","sequence":"additional","affiliation":[{"name":"Division of Digestive and General Surgery Niigata University Graduate School of Medical and Dental Sciences 1\u2010757 Asahimachi\u2010dori, Chuo\u2010ku 951\u20108510 Niigata City Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,6,30]]},"reference":[{"key":"e_1_2_7_2_2","first-page":"235","volume-title":"American Joint Committee on Cancer Staging Manual","author":"Edge SB","year":"2010"},{"key":"e_1_2_7_3_2","first-page":"51","volume-title":"Classification of Biliary Tract Carcinoma. 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