BACKGROUND Advanced rectal cancer with submesenteric lymph node metastasis is a common complication of advanced rectal cancer,which has an important impact on the treatment and prognosis of patients.AIM To investigate...BACKGROUND Advanced rectal cancer with submesenteric lymph node metastasis is a common complication of advanced rectal cancer,which has an important impact on the treatment and prognosis of patients.AIM To investigate the clinical and pathological characteristics of inferior mesenteric artery(IMA)root lymph node metastases in patients with rectal cancer.The findings of this study provided us with fresh medical information that assisted us in determining the appropriate treatment for these patients.METHODS Our study searched PubMed,Google Scholar,and other databases and searched the relevant studies and reports on the risk factors of IMA root lymph node metastasis of rectal cancer published in the self-built database until December 31,2023.After data extraction,the Newcastle-Ottawa scale was used to evaluate the quality of the included literature,and RevMan5.3 software was used for meta-analysis and heterogeneity testing.The fixed effect modules without heterogeneity were selected to combine the effect size,and the random effect modules with heterogeneity were selected to combine the effect size.The cause of heterogeneity was found through sensitivity analysis,and the data of various risk factors were combined to obtain the final effect size,odds ratio(OR)value,and 95%confidence interval(CI).Publication bias was tested by drawing funnel plots.RESULTS A total of seven literature were included in this study.By combining the OR value of logistic multivariate regression and the 95%CI of various risk factors,we concluded that the risk factors for lymph node metastasis in the IMA region of rectal cancer were as follows:Preoperative carcinoembryonic antigen(CEA)>5 ng/mL(OR=0.32,95%CI:0.18-0.55,P<0.05),tumor located above peritoneal reflexive(OR=3.10,95%CI:1.78-5.42,P<0.05),tumor size≥5 cm(OR=0.36,95%CI:0.22-0.57,P<0.05),pathological type(mucinous adenocarcinoma/sig-ring cell carcinoma)(OR=0.23,95%CI:0.13-0.41,P<0.05),degree of tumor differentiation(low differentiation)(OR=0.17,95%CI:0.10-0.31,P<0.05),tumor stage(T3-4 stage)(OR=0.11,95%CI:0.04-0.26,P<0.05),gender and age were not risk factors for IMA root lymph node metastasis in rectal cancer(P>0.05).CONCLUSION Preoperative CEA level,tumor location,tumor size,tumor pathologic type,tumor differentiation,and T stage were correlated with IMA root lymph node metastasis.展开更多
The article investigates some properties of square root of T3 tree’s nodes. It first proves several inequalities that are helpful to estimate the square root of a node, and then proves several theorems to describe th...The article investigates some properties of square root of T3 tree’s nodes. It first proves several inequalities that are helpful to estimate the square root of a node, and then proves several theorems to describe the distribution of the square root of the nodes on T3 tree.展开更多
提出了一种应用于移动自主网中节点定位的波达方向(Direction of Arrival,DOA)估计新方法,以满足移动自主网对节点定位机制的高精度和低复杂度的要求。利用牛顿法将延迟相加法和求根多重信号分类算法(Root-MUSIC)进行联合估计,定位过程...提出了一种应用于移动自主网中节点定位的波达方向(Direction of Arrival,DOA)估计新方法,以满足移动自主网对节点定位机制的高精度和低复杂度的要求。利用牛顿法将延迟相加法和求根多重信号分类算法(Root-MUSIC)进行联合估计,定位过程分为2个阶段:采用延迟相加法进行实时粗略DOA估计;采用Root-MUSIC进行精准定位。将该方法实现于软件无线电(SDR)系统,综合了延迟相加法低复杂度和Root-MUSIC高估计精度的优点。Matlab仿真实验结果证明了该方法以较低的复杂度获得近似于单独采用Root-MUSIC所达到的高精度,解决了现有方法难以同时达到高精度和低复杂度的问题。展开更多
文摘BACKGROUND Advanced rectal cancer with submesenteric lymph node metastasis is a common complication of advanced rectal cancer,which has an important impact on the treatment and prognosis of patients.AIM To investigate the clinical and pathological characteristics of inferior mesenteric artery(IMA)root lymph node metastases in patients with rectal cancer.The findings of this study provided us with fresh medical information that assisted us in determining the appropriate treatment for these patients.METHODS Our study searched PubMed,Google Scholar,and other databases and searched the relevant studies and reports on the risk factors of IMA root lymph node metastasis of rectal cancer published in the self-built database until December 31,2023.After data extraction,the Newcastle-Ottawa scale was used to evaluate the quality of the included literature,and RevMan5.3 software was used for meta-analysis and heterogeneity testing.The fixed effect modules without heterogeneity were selected to combine the effect size,and the random effect modules with heterogeneity were selected to combine the effect size.The cause of heterogeneity was found through sensitivity analysis,and the data of various risk factors were combined to obtain the final effect size,odds ratio(OR)value,and 95%confidence interval(CI).Publication bias was tested by drawing funnel plots.RESULTS A total of seven literature were included in this study.By combining the OR value of logistic multivariate regression and the 95%CI of various risk factors,we concluded that the risk factors for lymph node metastasis in the IMA region of rectal cancer were as follows:Preoperative carcinoembryonic antigen(CEA)>5 ng/mL(OR=0.32,95%CI:0.18-0.55,P<0.05),tumor located above peritoneal reflexive(OR=3.10,95%CI:1.78-5.42,P<0.05),tumor size≥5 cm(OR=0.36,95%CI:0.22-0.57,P<0.05),pathological type(mucinous adenocarcinoma/sig-ring cell carcinoma)(OR=0.23,95%CI:0.13-0.41,P<0.05),degree of tumor differentiation(low differentiation)(OR=0.17,95%CI:0.10-0.31,P<0.05),tumor stage(T3-4 stage)(OR=0.11,95%CI:0.04-0.26,P<0.05),gender and age were not risk factors for IMA root lymph node metastasis in rectal cancer(P>0.05).CONCLUSION Preoperative CEA level,tumor location,tumor size,tumor pathologic type,tumor differentiation,and T stage were correlated with IMA root lymph node metastasis.
文摘The article investigates some properties of square root of T3 tree’s nodes. It first proves several inequalities that are helpful to estimate the square root of a node, and then proves several theorems to describe the distribution of the square root of the nodes on T3 tree.
文摘提出了一种应用于移动自主网中节点定位的波达方向(Direction of Arrival,DOA)估计新方法,以满足移动自主网对节点定位机制的高精度和低复杂度的要求。利用牛顿法将延迟相加法和求根多重信号分类算法(Root-MUSIC)进行联合估计,定位过程分为2个阶段:采用延迟相加法进行实时粗略DOA估计;采用Root-MUSIC进行精准定位。将该方法实现于软件无线电(SDR)系统,综合了延迟相加法低复杂度和Root-MUSIC高估计精度的优点。Matlab仿真实验结果证明了该方法以较低的复杂度获得近似于单独采用Root-MUSIC所达到的高精度,解决了现有方法难以同时达到高精度和低复杂度的问题。
