应用结直肠癌基因检测指导术后化疗

为了探讨结直肠癌基因检测在术后化疗中的应用价值,本研究于2015年2月至2017年2月期间,选取在我院行结直肠癌根治术患者102例,根据患者选取的治疗方案,分为观察组(n=47)和对照组(n=55)。其中观察组根据术后肿瘤组织基因检测结果给予化疗方案,对照组直接选用FOLFOX4方案,随访观察两组无进展生存期和总生存期。研究发现,观察组检测到1例Nras基因突变,3例Braf基因突变,19例Kras基因突变,2例Pik3ca基因突变;Kras基因突变与肿瘤部位和分化程度有关(p<0.05);观察组中位无进展生存期为23个月,明显长于对照组的17个月,差异比较具有统计学意义(p<0.05);观察组中位总生存期为31个月,明显长于对照组的25个月,差异比较具有统计学意义(p<0.05);观察组和对照组Ⅲ～Ⅳ级肝肾损害、骨髓抑制和胃肠道反应比例比较差异无统计学意义(p>0.05)。研究表明结直肠癌基因检测指导术后化疗,可以提高患者无进展生存期和总生存期,具有较好的应用价值。     

一种新型的双功能体内突变检测系统的建立

将含有两个LacI靶基因的穿梭质粒pMCLacI/neo整合入小鼠的基因组中 ,建立一种能同时分析体内表达基因和沉默基因的双功能的新型体内突变检测系统 ,使在体内比较分析不同组织、器官中表达基因和沉默基因的突变谱和突变率成为可能。486个经显微注射过 pMCLacI/neo质粒的C5 7BL/ 6小鼠的受精卵 ,分别移植入 18只假孕母鼠的输卵管中 ,产下 32只存活小鼠 ,进一步检测证实 :(1)有 5只小鼠在基因组中整合有 pMCLacI/neo基因 ;(2 )该质粒中的两个LacI靶基因 ,只有一个表达 ;(3)能有效地从小鼠基因组中回收 pMCLacI/neo基因。因此 ,成功建立了pMCLacI/neo的转基因小鼠品系 ;可以将该小鼠用于整体动物水平研究表达基因和沉默基因突变机制的模型 ;该模型为一种具有双功能的新型体内突变检测系统     

Guide to the management of rubella problems.

Despite the availability of rubella vaccine the incidence of the congenital rubella syndrome has been increasing in certain regions of Canada. Perhaps this is not surprising in view of the known irregular cyclic activity of rubella virus in a community and the fact that the percentage of seropositive women of childbearing age has not changed appreciable since the vaccine was introduced. Clearly vaccine is not being administered to sufficient numbers of women at risk. Until a much higher percentage of women of childbearing age possess rubella antibody, the costly problem of congenital rubella syndrome is likely to be with us. Common rubella problems relate to four categories: the exposed pregnant woman, laboratory diagnosis, the infant with suspected congenital rubella and the vaccine. One of the most common questions about the vaccine is the following: Can recently vaccinated individuals disseminate vaccine and infect seronegative contact? The answer is No.     

Guide to the Internet. The world wide web.

The world wide web provides a uniform, user friendly interface to the Internet. Web pages can contain text and pictures and are interconnected by hypertext links. The addresses of web pages are recorded as uniform resource locators (URLs), transmitted by hypertext transfer protocol (HTTP), and written in hypertext markup language (HTML). Programs that allow you to use the web are available for most operating systems. Powerful on line search engines make it relatively easy to find information on the web. Browsing through the web--"net surfing"--is both easy and enjoyable. Contributing to the web is not difficult, and the web opens up new possibilities for electronic publishing and electronic journals.     

鼻咽癌中TSG101基因的突变研究

应用PCR-SSCP方法对鼻咽癌中TSG101基因的编码区进行突变检测,以探讨该基因在鼻咽癌变过程中的作用,16例鼻咽癌标本中未发现TSG101基因编码区存在突变,以上结果可以初步排除TSG101基因在鼻咽癌中突变的可能。     

A Guide to Interpreting Soil Ingestion Studies. 1. Development of a Model to Estimate the Soil Ingestion Detection Level of Soil Ingestion Studies

Abstract

This paper provides a model to predict soil ingestion recovery values in soil ingestion studies either retrospectively or prospectively. The predictive equations generated from the model can be used to estimate minimum soil ingestion detection levels from soil ingestion studies which use mass-balance methods. The model is derived from data assessing soil recovery efficiencies in adults using eight different predictive tracer elements. The results constitute a methodology to determine minimum detection levels of soil ingestion, and hence have important regulatory significance.     

基于核酸侵入反应的基因突变检测方法研究进展

肿瘤靶向药物治疗需要检测特异性的基因突变。尽管已开发出多种基于模板扩增的基因突变检测方法,但由于存在扩增产物交叉污 染的风险,其应用受到极大限制。基于信号扩增的核酸侵入反应,由于不存在扩增产物污染的风险,并且具有良好的单碱基识别特异性, 非常适用于基因突变的检测。因此,一系列基于核酸侵入反应的基因突变检测方法应运而生。综述若干基于核酸侵入反应的基因突变检测 方法原理与应用研究。     

Guide to Authors

Applied Biochemistry and Microbiology -