AIM:To compare and evaluate the appropriate prog-nostic indicators of lymph node basic staging in gastric cancer patients who underwent radical resection.METHODS:A total of 1042 gastric cancer patients who underwent r...AIM:To compare and evaluate the appropriate prog-nostic indicators of lymph node basic staging in gastric cancer patients who underwent radical resection.METHODS:A total of 1042 gastric cancer patients who underwent radical resection and D2 lymphadenectomy were staged using the 6th and 7th edition International Union Against Cancer(UICC)N staging methods and the metastatic lymph node ratio(MLNR)staging.Ho-mogeneity,discriminatory ability,and gradient mono-tonicity of the various staging methods were compared using linear trend χ2,likelihood ratio χ2 statistics,and Akaike information criterion(AIC)calculations.The area under the curve(AUC)was calculated to compare the predictive ability of the aforementioned three stag-ing methods.RESULTS:Optimal cut-points of the MLNR were cal-culated as MLNR0(0),MLNR1(0.01-0.30),MLNR2(0.31-0.50),and MLNR3(0.51-1.00).In univariate,multivariate,and stratified analyses,MLNR staging was superior to the 6th and 7th edition UICC N stag-ing methods.MLNR staging had a higher AUC,higher linear trend and likelihood ratio χ2 scores and lower AIC values than the other two staging methods.CONCLUSION:MLNR staging predicts survival after gastric cancer more precisely than the 6th and 7th edi-tion UICC N classif ications and should be considered as an alternative to current pathological N staging.展开更多
Using the Cournot Game Model, this paper has analyzed the motivation of the distributors' alliance to gain competitive advantage in marketing channel. At first, this paper separately analyzed the advantage of alli...Using the Cournot Game Model, this paper has analyzed the motivation of the distributors' alliance to gain competitive advantage in marketing channel. At first, this paper separately analyzed the advantage of alliance in the situation of oneshort game and infinitely repeated game, then, based on the analysis of distributors' betrayal of the alliance under infinitely repeated game, the conditions to maintain the distributors alliance are put forward and discussed.展开更多
基金Supported by The Science and Technology Program of Guangdong Province (2009B030801112)the Natural Science Foundation of Guangdong Province,China,No.9151008901000119the Science and Technology Program of Huangpu District,Guangdong Province (031)
文摘AIM:To compare and evaluate the appropriate prog-nostic indicators of lymph node basic staging in gastric cancer patients who underwent radical resection.METHODS:A total of 1042 gastric cancer patients who underwent radical resection and D2 lymphadenectomy were staged using the 6th and 7th edition International Union Against Cancer(UICC)N staging methods and the metastatic lymph node ratio(MLNR)staging.Ho-mogeneity,discriminatory ability,and gradient mono-tonicity of the various staging methods were compared using linear trend χ2,likelihood ratio χ2 statistics,and Akaike information criterion(AIC)calculations.The area under the curve(AUC)was calculated to compare the predictive ability of the aforementioned three stag-ing methods.RESULTS:Optimal cut-points of the MLNR were cal-culated as MLNR0(0),MLNR1(0.01-0.30),MLNR2(0.31-0.50),and MLNR3(0.51-1.00).In univariate,multivariate,and stratified analyses,MLNR staging was superior to the 6th and 7th edition UICC N stag-ing methods.MLNR staging had a higher AUC,higher linear trend and likelihood ratio χ2 scores and lower AIC values than the other two staging methods.CONCLUSION:MLNR staging predicts survival after gastric cancer more precisely than the 6th and 7th edi-tion UICC N classif ications and should be considered as an alternative to current pathological N staging.
基金This work was supported by Natural science Foundation of China No. 70302017
文摘Using the Cournot Game Model, this paper has analyzed the motivation of the distributors' alliance to gain competitive advantage in marketing channel. At first, this paper separately analyzed the advantage of alliance in the situation of oneshort game and infinitely repeated game, then, based on the analysis of distributors' betrayal of the alliance under infinitely repeated game, the conditions to maintain the distributors alliance are put forward and discussed.
