简介：Colorectalcarcinoma(CRC)isacommoncauseofmorbidityandmortalityworldwide.TwopathogenicpathwaysareinvolvedinthedevelopmentofadenomatoCRC.ThefirstpathwayinvolvesAPC/β-catenincharacterizedbychromosomalinstabilityresultingintheaccumulationofmutations.ThesecondpathwayischaracterizedbylesionsinDNAmismatchrepairgenes.AberrantDNAmethylationinselectedgenepromotershasemergedasanewepigeneticpathwayinCRCdevelopment.CRCscreeningisthemostefficientstrategytoreducedeath.SpecificDNAmethylationeventsoccurinmultistepcarcinogenesis.EpigeneticgenesilencingisacausativefactorofCRCdevelopment.DNAmethylationshavebeenextensivelyexaminedinstoolfromCRCandprecursorlesions.ManymethylatedgeneshavebeendescribedinCRCandadenoma,althoughnodefiniteDNAmethylationbiomarkerspanelhasbeenestablished.MultipleDNAmethylationbiomarkers,includingsecretedfrizzled-relatedprotein2,secretedfrizzled-relatedprotein1,tissuefactorpathwayinhibitor2,vimentin,andmethylguanineDNAmethyltransferase,havebeenfurtherinvestigated,andobservationshaverevealedthatDNAmethylationbiomarkersexhibitwithhighsensitivityandspecificity.ThesemarkersmayalsobeusedtodiagnoseCRCandadenomainearlystages.Realtimepolymerasechainreaction(qPCR)issensitive,scalable,specific,reliable,timesaving,andcosteffective.Stoolexfoliatedmarkersprovideadvantages,includingsensitivityandspecificity.AstoolqPCRmethylationtestmayalsobeanenhancedtoolforCRCandadenomascreening.

简介：Someantitumoractivitiesofcomponent(E),extractedfromtherootofFagopynumCymosum(Trev)Meisn(FCTM),haverecentlybeendiscoveredinvivoandinvitro.ThecomponentE(CE)’spatternofactionwithtumorcellularDNAatthemolecularpharmacologicallevelwasinvestigatedbymacromolecularsynthesisexperiment(MSE)andhumanDNAinteractionsystemestablishedinourlaboratory.Theexperimentsdemonstratedthat,invitro,theagentcouldmarkedlyinhibittheincorporationof3H-TdRintothecellularDNA,andtheIC50inP388leukemiacellandinSGC-7901cellwas17.86μg/mland110.4μg/ml,respectively.Theagent,atmg/mllevel,couldproduceanintercalationreversionpatternwithDNAwithinashorttime(2hours).Butwhentheintervalwasprolongedforover4hours,theactionchangedtointercalationirreversiblepattern.Accordingtotheseobservations,theauthorsinferthatCEinteractswithDNAintwoways-directlyandindirectly.Theindirectaction,especiallyinlowconcentr

简介：Objective:TolookforthefurtherevidenceforHPVL1HPV16E6,HPV18E6andEBVascarcinogenicfactorsinlaryngealcarcinoma.Method:weexaminedrepresentativenumbersofspecimensfromlaryngealcancerwithhighlysensitivePCRtechniqueforthepresenceofHPVL1andhigh-risktypesHPV16E6,HPV18E6andEBVLMP1.Results:UsingPCRdetection,7.3%sampleswereHPVL1positive,52.03%wereHPV16E6positive,30.89%wereHPV18E6positiveand9.13%wereEBVLMP1positive.ThelowincidenceofHPVL1andhighincidenceofHPV-16E6andHPV18E6genessuggestthatHPVmightbeintegratedintotumorcells.OurresultssupportaroleofHPV-16andHPV-18infectioninthepathogenesisoflaryngealcarcinomainChina.Conclusion:IntegrationofE6intohostgenomeandstableexpressionofthesegenesmaybeassociatedwiththecarcinogenesisoflaryngealcarcinoma.HPV-16andHPV-18maysynergisticallyfunctiononthepathogenesisoflaryngealcarcinoma.Ourresultssuggestanassociationoflaryngealcarcinogenesisandinfectionwiththehigh-riskHPVtypes16,HPV18andEBV.

简介：Cancercellsdifferfromnormalcellsinvariousparameters,andthesedifferencesarecausedbygenomicmutationsandconsequentialalteredgeneexpression.Thegeneticandfunctionalheterogeneityoftumorcellsisamajorchallengeincancerresearch,detection,andeffectivetreatment.Assuch,theuseofdiagnosticmethodsisimportanttorevealthisheterogeneityatthesingle-celllevel.Dropletmicrofluidicdevicesareeffectivetoolsthatprovideexceptionalsensitivityforanalyzingsinglecellsandmolecules.Inthisreview,wehighlighttwonovelmethodsthatemploydropletmicrofluidicsforultrasensitivedetectionofnucleicacidsandproteinmarkersincancercells.Wealsodiscussthefuturepracticalapplicationsofthesemethods.

简介：表观遗传学的研究表明，脑肿瘤细胞中某些基因的高甲基化可以用来标记肿瘤预后，甲基化后的沉默产物可作为化疗反应的生物标记分子，而对DNA甲基化抑制剂的研究已成为肿瘤治疗的新方向。总之，在脑肿瘤的发生和发展中。DNA甲基化起着重要的作用。本文总结了肿瘤甲基化方面的最新进展。

简介：TheDNAcontentandmorphometricfeaturesofhepatocellularcarcinoma(HCC)andlivercelldysplasia(LCD),includingnucleararea,nuclearperimeter,nuclearmaximumdiameterandnuclearcirclediameter,werequantitativelydeterminedbymeansofimageanalysistechnology.Theresultsshowedthatincomparisonwithnormalhepatocytes,LCDhadamarkedlyincreasedDNAcontentandnuclearmorphometricparameters,butthevalueswerelowerthanthoseforHCC.LCDshowedaslightincreaseinnuclearatypiarepresentedbythenuclearirregularindex,whichwasalsolessthanHCC.ThefindingsindicatethatLCDmaybeaprecaneerouslesionofHCC,tothecellsinanabnormalproliferativestate.

简介：Rat-1cellsweretransfectedwithDNAfromhumanesophagealcancer2K,4K,6K,7K.8K.Thetransformingfociwereobtainedandthetransformingcelllineswereestablished.Thecelllinescanformlargercolonyinsoftagar.Thosenudemiceinjectedsubcutaneouslywiththecellssufferedfromlargerfibroussarcoma.Thisindicatesthatthecelllineshavecarcinogenicity.TheexperimentalresultssuggestthathumanDNAsequenceandhumanHa-rasspecial616Kb(BamHI)bandarepresentintheDNAofthetransformingcells.Theover-expressionofrasgeneproductsP21werefoundinthetissuesofexophagealcancer,thetissuesadjacenttotumorandthetransformingcells.

简介：Objective:Theelevatedincidenceofobesityhasbeenparalleledwithhigherrisksofbreastcancer.Highadiposityincreasesleptinsecretionfromadiposetissue,whichinturnincreasescancercellproliferation.Theinterplaybetweenleptinandestrogenisoneofthemechanismsthroughwhichleptininfluencesbreastcarcinogenesis.Anunbalancedestrogenmetabolismincreasestheformationsofcatecholestrogenquinones,DNAadducts,andcancermutations.ThisstudyaimstoinvestigatetheeffectofleptinonsomeestrogenmetabolicenzymesandDNAadductioninbreastcancercells.Methods:Highperformanceliquidchromatography(HPLC)wasperformedtoanalyzetheDNAadducts4-OHE1[E2]-1-N3adenineand4-OHE1[E2]-1-N7guanine.Reportergeneassay,realtimereversetranscriptionpolymerasechainreaction(realtimeRT-PCR),andWesternblotwereusedtoassesstheexpressionofestrogenmetabolizinggenesandenzymes:CytochromeP-4501B1(CYP1B1),Nicotinamideadeninedinucleotidephosphate-quinoneoxidoreductase1(NQO1),andCatechol-O-methyltransferase(COMT).Results:LeptinsignificantlyincreasedtheDNAadducts4-OHE1[E2]-1-N3adenineand4-OHE1[E2]-1-N7guanine.Furthermore,leptinsignificantlyupregulatedCYP1B1promoteractivityandproteinexpression.TheluciferasepromoteractivitiesofNQO1andmRNAlevelsweresignificantlyreduced.Moreover,leptingreatlyreducedthereporteractivitiesoftheCOMT-P1andCOMT-P2promotersanddiminishedtheproteinexpressionofCOMT.Conclusions:LeptinincreasesDNAadductlevelsinbreastcancercellspartlybyaffectingkeygenesandenzymesinvolvedinestrogenmetabolism.Thus,increasedfocusshouldbedirectedtowardleptinanditseffectsontheestrogenmetabolicpathwayasaneffectiveapproachagainstbreastcancer.

简介：DuckhepatitisBvims(DHBV)DNAwasdetectedindifferenttumorousnodulesofduckswithhepaticmulticentriccancerorintrahepaticmetastasisbySouthernblottechnique.Among7duckswithhepatocellularcarcinomaofmultipletumornodules,thehybridizationpatternofIntegratedDHBVDNAIndifferenttumorousnoduleswasidenticalin3casesanddifferentin2cases.OnecaseshowedasimilarhybridizationpatternintwotumorousnodulesandotheronewasnegativetorDHBVDNA.IntegratedDHBVDNAwasalsoidentifiedinametastaticlungcancerofduckswithhepatocellularcarcinoma.Thehybridizationpatternofmetastasisoflungswasasthesomeasthatinprimaryhepatocellularcarcinoma.ThesamediscretehybridizationbandsInthedifferenttumorousnodulesindicatethatthesenodulesmightarisefromonetransformedcell.ThedifferenthybridizationpatternsInvarioustumorousnodulesshowthatthesetumorousnodulesmightarisefromvarioustransformedcells.Theresultssuggestthatthehyb

简介：ＴＨＥＳＴＵＤＩＥＳＯＦＲＥＶＥＲＳＡＬＯＮＩＮＨＩＢＩＴＩＮＧＤＮＡＳＹＮＴＨＥＳＩＳＡＮＤＣＬＯＮＡＬＦＯＲＭＡＴＩＯＮＯＦＨＬ－６０ＣＥＬＬＳＷＩＴＨＨＹＰＥＲＴＨＥＲＭＩＡＣｈｅｎＸｉｅｑｕｎ；ＳｈｅｎＳｕｙｕｎ；ＨｕＳｈｅｎｇｈｕｉ；ＷｕＢ...

简介：一项新的研究发现，在行食管切除术的食管癌患者中，循环血液中DNA水平可能有助于衡量切除的完整性，以判断是否存在残余肿瘤或早期复发。

简介：ＵＳＩＮＧ３ＰＲＩＭＥＲＰＡＩＲＳＴＯＤＥＴＥＣＴＨＢＶＤＮＡＩＮＬＩＶＥＲＴＩＳＳＵＥＳＦＲＯＭＨＥＰＡＴＯＣＥＬＬＵＬＡＲＣＡＲＣＩＮＯＭＡＳＷＩＴＨＰＣＲ　ＴＥＣＨＮＩＱＵＥＣｈｅｎＭｉｎｇ陈明；ＬｕＬｉｎｇ吕凌；ＹａｏＪｉｌｕ姚集鲁；Ｐｅｎｇ...

简介：ＩＮＶＥＳＴＩＧＡＴＩＯＮＯＦＲＥＬＡＴＩＯＮＳＨＩＰＳＢＥＴＷＥＥＮＫＩ－６７ＳＣＯＲＥ，ＤＮＡＩＮＤＥＸ，ＡＮＤＨＩＳＴＯＬＯＧＩＣＧＲＡＤＥＩＮＳＯＦＴＴＩＳＳＵＥ　ＳＡＲＣＯＭＡＳＷａｎｇｙａｎｏｎｇ王亚农；ＳｈｉＤａｒｅｎ施达仁；ＳｈｅｎＺ...

简介：目的：探讨胸腔积液中细胞DNA的含量分析对良恶性胸腔积液的鉴别诊断价值。方法：46例胸腔积液患者，分为恶性和良性两组，采用全自动细胞DNA定量分析系统测定胸腔积液细胞DNA的含量，同时检测癌胚抗原（CEA）。结果：对于恶性胸腔积液，全自动细胞DNA分析诊断的敏感性为58．3％，特异性为100．0％，准确性78．3％，而CEA分别为54．2％、81．8％和67．4％。如两项指标中任何一项阳性，诊断的敏感性、特异性和准确性分别为87．5％，81．8％和84．8％；两项指标同时阳性，特异性可达100．0％。结论：全自动细胞DNA定量分析对胸腔积液的鉴别有重要的临床参考价值，联合胸腔积液的CEA检测，可以提高诊断的有效性。

简介：分支链DNA信号放大技术（bDNA）是一种基于探针杂交信号放大的检测系统，无需对mRNA纯化和反转录即可对mRNA做精确的定量检测，有灵敏度高、线性范围宽、准确性好和结果稳定可靠等优点，具有良好的临床科研应用价值。本文就bDNA技术的原理及其在CMV、HBV、HCV和HIV等病毒定量检测、基因表达分析以及肿瘤基因分析等方面的应用作一介绍。

简介：

简介：结直肠癌（Colorectalcancer,CRC）是结直肠黏膜上皮在多种致癌因素作用下发生的恶性肿瘤,发病率位居常见恶性肿瘤第3位,预后差,病死率较高。早期CRC的五年生存率可达90%,而晚期CRC则降为5%。因此,早诊断、早治疗是防治CRC的关键,可显著降低其死亡率~（[1-3]）。理想的CRC筛查方法应具备精确、方便、无创、便宜、快速等特点。

简介：目的探讨DNA修复基因MGMT和hMLT1在乳腺癌组织中的表达与病人年龄，肿瘤大小、淋巴结转移、TNM分期、癌组织分级、ER和PR受体及5年生存率的关系。方法应用免疫组织化学法，检测40例乳腺癌组织中MGMT和hMLT1蛋白表达。结果40例乳腺癌组织中MGMT表达阴性9例(22．5％)，hMLT1表达阴性12例(30％)。对照组良性乳腺疾病组织均表达MGMT和hMLT1。癌组织同时不表达MGMT和hMLT1的乳腺癌病人有7例(17．5％)，其5年生存率明显低于同时表达MGMT和hMLT126例乳腺癌病人(69．0％)(P<0．05)。MGMT和hMLT1在乳腺癌组织的表达与病人年龄、肿瘤大小、淋巴结转移，TNM分期、癌组织分级和激素受体状态等临床指标均无关(P均>0．05)。结论MGMT和hML腺疾病组织均有表达，在乳腺癌组织中有22．5％和30．0％不表达。二种DNA修复基因表达阴性的乳腺癌病人预后较差，提示联合检测MGMT和hMLT1两种DNA修复基因可作为判断乳癌预后的指标．

简介：目的探讨肝细胞癌（HCC）患者术前HBVDNA含量对切除术后肝功能恢复的影响。方法收集我科2007年1月至2007年6月行手术切除治疗的原发性肝癌患者共217例,应用实时荧光定量PCR方法检测血清中HBVDNA,按照HBVDNA含量分为两组：A组（HBVDNA≥1.0×105拷贝/ml）68例,B组（HBVDNA〈1.0×105拷贝/ml）149例。严密观察患者术后肝功能变化情况,采用SPSS13.0软件进行统计分析。结果术后两组患者的肝功能变化存在着显著差异,A组的肝功能损伤程度高于B组。术后第1、3、7天,丙氨酸氨基转移酶（ALT）和天门冬氨酸氨基转移酶（AST）数值A组明显高于B组,而前白蛋白数值则B组高于A组,两组差异有统计学意义（P〈0.05）;术后第3、7天,总胆红素（TBIL）数值A组明显高于B组,两组差异有统计学意义（P〈0.05）。除术前凝血酶原时间（PT）、前白蛋白、TBIL、AST和术中肝门阻断时间外,术前HBVDNA浓度对术后第7天的血清TBIL水平有显著影响。结论HCC患者术前HBVDNA含量对于术后肝功能恢复有明显影响,对术前HBVDNA含量较高的患者应在治疗肝癌的同时给予抗病毒治疗。

简介：目的评价DNA分析在痰液涂片细胞学检查中作用和意义。方法对HE染色痰涂片褪色后行Feulgen染色，用HPIAS-1000型高清晰度彩色全自动分析系统作DNA分析。结果35例肺癌细胞及9例不典型支气管上皮细胞DNA均为异倍体（heteroploid，H）核型。两组细胞DNA二倍体，异倍体（2C／H）核型分别占37．1％和66．6％（P〈0．001），五倍体/非整倍体（5C／AN）核型分别占71．4％、0．0％（P〈0．001），非整倍体（AN）核型占97．1％、0．0％（P〈0．001）；而增生期百分比（PF）分别占（83．8±19．7）％、（47．629±．5）％（P〈0．001）。癌细胞组29例非小细胞癌与6例小细胞癌的2C／H核型分别占44．8％和0．0％（P〈0．001），5C／AN占65．5％、100．0％（P〈0．001），非整倍体（AN）核型为96．5％、100．0％（P〉0．05）；而PF值为（83．1±20．1）％、（95．0±2．0）％（P〈0．02）。结论痰液细胞DNA分析指标（倍体核型、增殖期百分比）可作为细胞学肺癌诊断的重要理论参考。