碘化钾制备的碘涂层钛板的抗菌性能研究

目的探讨利用碘化钾制备碘涂层钛板的可行性,并验证其抗菌性能。方法以碘化钾作为电解液,使用电泳沉积法将碘负载到钛板表面,制备出碘涂层钛板。通过扫描电镜与能谱分析,观察碘涂层钛板的表面征象和成分结构。实验分组:对照组是经过预处理但未行载碘的钛板,共10块;实验组是经过预处理后再行载碘的碘涂层钛板,根据电解液浓度的不同分为3组:1000 mg/L、2000 mg/L、4000 mg/L组,每组各10块。使用1×106 CFU/mL的金黄色葡萄球菌(ATCC25923)进行体外抗菌实验,并对其抗菌性能进行研究。结果碘涂层钛板外观呈灰色,表面可均匀覆盖一层平整、无塌陷的涂层,电镜下见其表面可形成碘涂层,局部散在分布大小不等的不规则陷凹。对照组、1000 mg/L组、2000 mg/L组、4000 mg/L组的钛板碘含量分别为0、5.10、10.32、15.05 mass%;其体外抗菌菌落计数分别为56.00±5.09、21.40±2.76、9.10±2.51和2.00±1.88,4组之间菌落计数比较差异均有统计学意义(P<0.05)。结论碘化钾作为电解液,使用电泳沉积法可成功制备出碘含量稳定、涂层分布均匀的碘涂层钛板。体外抗菌实验证明碘涂层钛板的抗菌性能强于未载碘钛板。     

微创McKeown食管切除术治疗食管下段癌的临床价值

目的探讨微创McKeown食管切除术治疗下段食管癌的临床价值。方法选取2013-01-2017-06间在郑州大学第一附属医院接受食管切除术的下段食管癌患者。将行微创McKeown手术的患者作为微创组,将行开放Sweet手术的患者作为开放组,倾向得分匹配(PSM)用于降低2组一般资料的统计学差异。比较2组患者的疗效。结果全部患者均顺利完成手术。2组患者的病死率、肺部并发症和吻合口漏发生率差异无统计学意义(P>0.05)。微创组淋巴结清扫数、平均住院费用和手术时间均多于开放组,差异均有统计学意义(P<0.05)。结论微创McKeown食管切除术治疗下段食管癌,较传统开放手术淋巴结清扫数多,但手术时间和治疗费用较多。     

Prediction model for malignant pulmonary nodules based on cfMeDIP-seq and machine learning

Cell-free methylated DNA immunoprecipitation and high-throughput sequencing (cfMeDIP-seq) is a new bisulfite-free technique, which can detect the whole-genome methylation of blood cell-free DNA (cfDNA). Using this technique, we identified differentially methylated regions (DMR) of cfDNA between lung tumors and normal controls. Based on the top 300 DMR, we built a random forest prediction model, which was able to distinguish malignant lung tumors from normal controls with high sensitivity and specificity of 91.0% and 93.3% (AUROC curve of 0.963). In summary, we reported a non–invasive prediction model that had good ability to distinguish malignant pulmonary nodules.     

上尿路尿路上皮癌术后辅助治疗研究进展

上尿路尿路上皮癌(upper tract urothelial carcinoma,UTUC)恶性程度高、预后差。目前手术是UTUC主要的治疗方法,但效果并不理想,超过50%患者术后局部或远处复发。因此,越来越多的研究对UTUC术后辅助治疗包括放疗、化疗及免疫检查点抑制剂等进行探索并取得一定进展。本文就UTUC术后辅助治疗研究作一综述。     

Mediation analysis of racial disparities in triple-negative breast cancer incidence among postmenopausal women

Breast Cancer Research and Treatment - Triple-negative breast cancer (TNBC) is disproportionately higher in Black women relative to White women. The objective of this study was to examine to what...