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A Lymph Node Staging System for Gastric Cancer: A Hybrid Type Based on Topographic and Numeric Systems

 Yoon Young Choi  ;  Ji Yeong An  ;  Hitoshi Katai  ;  Yasuyuki Seto  ;  Takeo Fukagawa  ;  Yasuhiro Okumura  ;  Dong Wook Kim  ;  Hyoung-Il Kim  ;  Jae-Ho Cheong  ;  Woo Jin Hyung  ;  Sung Hoon Noh 
 PLOS ONE, Vol.11(3) : e0149555, 2016 
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Aged ; Female ; Gastrectomy ; Humans ; Lymph Node Excision ; Lymph Nodes/pathology* ; Lymph Nodes/surgery ; Lymphatic Metastasis ; Male ; Middle Aged ; Neoplasm Staging ; Prognosis ; Stomach Neoplasms/pathology* ; Stomach Neoplasms/surgery* ; Survival Analysis
Although changing a lymph node staging system from an anatomically based system to a numerically based system in gastric cancer offers better prognostic performance, several problems can arise: it does not offer information on the anatomical extent of disease and cannot represent the extent of lymph node dissection. The purpose of this study was to discover an alternative lymph node staging system for gastric cancer. Data from 6025 patients who underwent gastrectomy for primary gastric cancer between January 2000 and December 2010 were reviewed. The lymph node groups were reclassified into lesser-curvature, greater-curvature, and extra-perigastric groups. Presence of any metastatic lymph node in one group was considered positive. Lymph node groups were further stratified into four (new N0-new N3) according to the number of positive lymph node groups. Survival outcomes with this new N staging were compared with those of the current TNM system. For validation, two centers in Japan (large center, n = 3443; medium center, n = 560) were invited. Even among the same pN stages, the more advanced new N stage showed worse prognosis, indicating that the anatomical extent of metastatic lymph nodes is important. The prognostic performance of the new staging system was as good as that of the current TNM system for overall advanced gastric cancer as well as lymph node-positive gastric cancer (Harrell C-index was 0.799, 0.726, and 0.703 in current TNM and 0.799, 0.727, and 0.703 in new TNM stage). Validation sets supported these outcomes. The new N staging system demonstrated prognostic performance equal to that of the current TNM system and could thus be used as an alternative.
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1. College of Medicine (의과대학) > Dept. of Surgery (외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Hyoung Il(김형일) ORCID logo https://orcid.org/0000-0002-6134-4523
Noh, Sung Hoon(노성훈) ORCID logo https://orcid.org/0000-0003-4386-6886
Cheong, Jae Ho(정재호) ORCID logo https://orcid.org/0000-0002-1703-1781
Choi, Yoon Young(최윤영) ORCID logo https://orcid.org/0000-0002-2179-7851
Hyung, Woo Jin(형우진) ORCID logo https://orcid.org/0000-0002-8593-9214
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