喉咽癌树突状细胞表型抗原表达

目的对喉咽癌中树突状细胞(Dendriticcells,DCs)的表型抗原的表达进行研究,探讨DC表型抗原的表达与喉咽癌各临床因素尤其是转移和预后的关系。方法对45例喉咽癌标本,用EnvisionHIS的方法检测DC的表型抗原S-100、CD1a、CD83的表达,并观察CD45RO T细胞与DC的关系。结果S-100 DCs在高分化组以及生存组中的数目明显多于中低分化组及死亡组,具有显著性差异。CD83 DCs的表达与喉咽癌的分化程度、远处转移、生存以及是否复发有关,差异具有显著性;CD83 DCs在癌巢中的数目较癌旁中的少,差异具有显著性。CD1a DCs的表达与喉咽癌的各临床因素间未发现明显相关性。CD45RO T细胞主要分布在CD83 DCs的周围。结论表达不同表型抗原的DC具有不同的功能,CD83 DCs被认为是成熟DC分布在癌旁与其激活T细胞的抗原提呈功能有关,对于肿瘤免疫防御机制的建立起着重要作用。DC在喉咽癌中的浸润程度及表型抗原的表达情况是反映宿主肿瘤免疫状况的重要指标,也是预测喉咽癌转移和预后的一项重要指标。     

CK4与CK13在喉咽鳞状细胞癌中的表达及其临床意义

目的：探讨喉咽鳞状细胞癌组织中细胞角蛋白13（CK13）和细胞角蛋白4（CK4）的表达与喉咽鳞状细胞癌临床病理特征的关系。方法：应用免疫组织化学方法检测56例喉咽鳞状细胞癌患者的癌组织标本及癌旁正常组织中CK13及CK4的蛋白表达,应用VIDAS图像分析仪分析其图像的积分光密度,并进行统计学处理。结果：CK4与CK13在癌旁正常组织中均呈强阳性表达,而在喉咽鳞状细胞癌组织中的表达下降（P〈0．01）,且与病理分化程度均呈正相关（P〈0．05）。CK4在T1、T2期的表达最强,在T3、T4期的表达依次减弱（F=93．814,P〈0．05）;CK4在Ⅰ～Ⅱ期的表达最强,在Ⅲ期、Ⅳ期中的表达逐渐减弱（F=127．894,P〈0．05）;CK4在无淋巴结转移的鳞状细胞癌组织中的表达较强,而在有淋巴结转移的鳞状细胞癌组织中表达较弱（T=10．678,P〈0．05）。而CK13与肿瘤大小、临床分期及有无淋巴结转移无显著相关。结论：CK4与CK13共同检测对喉咽鳞状细胞癌的早期诊断、手术方法的选择以及判断预后具有指导意义。     

喉鳞状细胞癌组织中p63表达的临床意义

目的：探讨p63基因在喉鳞状细胞癌中的表达及其临床意义。方法：用免疫组织化学法检测63例喉鳞状细胞癌（喉癌组）及其45例癌旁组织（癌旁组）、24例转移淋巴结（转移淋巴结组）、40例未转移淋巴结（未转移淋巴结组）及25例喉非癌组织（非喉癌组）中p63基因的表达。结果：p63基因在喉鳞状细胞癌组织中均为细胞核阳性表达,喉癌组及转移淋巴结组的中、强阳性率为95．2％（60／63）和83．3％（20／24）;癌旁组及未转移淋巴结组中无中、强阳性表达;非喉癌组中1例乳头状瘤为弱阳性表达,其余均为上皮细胞或基底细胞核弱阳性表达。结论：p63可作为喉鳞状细胞癌有特异性的标记物,对喉鳞状细胞癌的早期诊断和鉴别诊断有重要意义。p63可能主动参与了调控喉鳞状细胞癌的发生过程,但在喉鳞状细胞癌的发展过程中处于被激活状态,可能在发展过程中发挥负反馈的作用。     

慢性扁桃体炎患者外周血T淋巴细胞亚群的分析与临床意义

目的：探讨慢性扁桃体炎患者外周血T淋巴细胞各亚群的变化特点及其与肾损害的关系。方法：采用流式细胞仪检测54例慢性扁桃体炎患者和52例健康体检者的外周血初始T细胞、功能T细胞、激活T细胞及凋亡T细胞亚群百分比,并结合血清半胱氨酸蛋白酶抑制剂（CystatinC）、ASO和ESR水平进行统计学分析。结果：慢性扁桃体炎患者外周血CD3^＋T细胞、CD3^＋CD8^＋T细胞、CD4^＋CD28^＋T细胞、CD8^＋CD28^＋T细胞、CD4^＋HLA—DR^＋T细胞、CD8^＋HLA—DR^＋T细胞、CD8^＋CD95^＋T细胞与健康对照组相应细胞亚群之间的差异无统计学意义（P〉0．05）。但CD4^＋T细胞、CD4^＋CD45RA^＋T细胞和CD4^＋CD25^＋T细胞减少,CD4^＋CD45RO^＋T细胞、CD8^＋CD38^＋T细胞和CD4^＋CD95^＋T细胞增加,CD4^＋／CD8^＋和CD4^＋CD45RA^＋／CD4^＋CD45RO^＋比值下降,与健康对照组相应细胞亚群之间的差异有统计学意义（P〈0．05）。慢性扁桃体炎患者的外周血CD4^＋CD45RA^＋T细胞百分比与其血清Cystatin C浓度负相关。结论：本研究通过对外周血各T细胞亚群变化特点的系统研究,证实了慢性扁桃体炎患者机体存在T细胞免疫平衡紊乱。CD4^＋CD45RA^＋T细胞的变化可以作为慢性扁桃体炎患者肾损害的相关参考指标。     

淋巴管内皮透明质酸受体-1标记的喉鳞状细胞癌组织淋巴管密度测定及其临床意义

目的：探讨喉鳞状细胞癌组织中微淋巴管密度、位置及增殖情况与喉癌生物学行为和临床病理因素的关系。方法：利用LSAB免疫组化三步法研究淋巴管内皮特异性标记物淋巴管内皮透明质酸受体-1（LYVE-1）在喉鳞状细胞癌组织中的表达，光镜和图像分析观察微淋巴管密度并对淋巴管进行定位；EnVision免疫组化二步法研究Ki67在LYVE-1（＋）管腔的表达，评价淋巴管增殖情况。结果：①颈淋巴结转移组瘤巢内LYVE-1（＋）管腔密度高于非转移组，差异有统计学意义（P〈0．01）；T1组瘤巢内LYVE-1（＋）管腔密度低于T2、T3、T4组，差异具有统计学意义（均P〈0．01），T2组瘤巢内LYVE-1（＋）管腔密度低于T3、T4组，差异有统计学意义（均P〈0．05），T3组与T4组瘤巢内LYVE-1（＋）管腔密度相比差异无统计学意义（P=0．582）；瘤巢内LYVE-1（＋）管腔密度在声门型组与声门上型组、鳞癌Ⅰ级组与鳞癌Ⅱ级组之间差异无统计学意义（均P〉0．05）。②颈淋巴结转移组瘤巢周LYVE-1（＋）管腔密度高于非转移组，差异无统计学意义（P〉0．05）。⑧瘤巢内LYVE-1（＋）管腔存在Ki67核棕黄色着色，瘤巢周LYVE-1（＋）管腔未见这一现象。结论：喉鳞状细胞癌组织LYVE-1标记的瘤巢内淋巴管密度与肿瘤浸润、淋巴结转移正相关；喉鳞状细胞癌肿瘤淋巴管生成主要在瘤巢内，瘤巢内淋巴管在肿瘤的浸润、转移过程中发挥更为重要的作用。     

FoxM1在喉鳞状细胞癌中的表达及其临床意义

目的:研究FoxM1在喉鳞状细胞癌组织中的表达及其临床意义。方法:运用免疫组织化学方法检测89例喉鳞状细胞癌组织、89例癌旁组织及20例喉乳头状瘤组织中FoxM1蛋白的表达情况,分析其与喉鳞状细胞癌临床病理参数的关系。采用反转录-聚合酶链反应(RT-PCR)检测20例喉鳞状细胞癌、20例喉乳头状瘤组织以及20例癌旁组织中FoxM1mRNA表达情况。结果:FoxM1mRNA和蛋白表达的阳性率在喉鳞状细胞癌、喉乳头状瘤及癌旁组织中逐渐降低,其差异有统计学意义(P<0.05)。FoxM1蛋白的表达随组织分化程度增高而降低(P<0.05);随T分期增高而增加(P<0.05);有淋巴结转移组高于无淋巴结转移组(P<0.05),随临床分期的增加而表达增加(P<0.05)。FoxM1表达率与患者年龄、性别、癌原发部位无相关性(P>0.05)。结论:FoxM1蛋白在喉鳞状细胞癌组织中表达的上调可能与喉鳞状细胞癌的发生及浸润转移有关。     

CD105与喉鳞状细胞癌血管生成及生物学行为的关系

目的：研究CD105在喉鳞状细胞癌血管中的表达,及其喉鳞状细胞癌生物学行为的意义。方法：采用双重免疫组织化学染色技术分别检测CD34／Ki67、CD105／Ki67在30例喉鳞状细胞癌和10例正常喉黏膜石蜡标本中的表达,分别以抗CD34和抗CD105单克隆抗体标记量化新生微血管（MVD）,以抗Ki67单克隆抗体标记增殖的内皮细胞,并结合临床资料进行分析。结果：正常组和喉鳞状细胞癌组比较,MVDCD105差异有统计学意义（P〈0．05）;喉鳞状细胞癌组CD105标记的微血管增殖指数（PI）高于CD34标记组（P〈0．01）;MVDCD34与MVDCD105在喉鳞状细胞癌高分化组和低分化组的差异均有统计学意义（P〈0．05）;MVDCD34与MVDCD105均与淋巴结转移无关（P〉0．05）;MVDCD34与肿瘤的浸润范围无关（P〉0．05）,与喉鳞状细胞癌的临床分期也无关（P〉0．05）;MVDCD105则随肿瘤浸润范围的增大而增加（P〈0．01）,且随临床分期升高而增加（P〈0．01）。结论：CD105是新生血管的特异性标志物,新生血管密度与肿瘤的大小、临床分期相关,但与喉鳞状细胞癌的淋巴结转移无关。     

血管细胞黏附分子-1及P-选择素在喉咽癌中的表达及与微血管密度的相关性研究

目的：检测喉咽癌组织中血管细胞黏附分子-1（vascular cell adhesion molecule-1，VCAM-1）及P-选择素的表达及其与微血管密度（mierovessel density，MVD）间的关系，探讨VCAM-1及P选择素在喉咽癌血管生成中的意义。方法：用免疫组织化学方法检测40例喉咽癌组织和10例正常口咽部黏膜组织中VCAM-1、P选择素及CD34表达并计数MVD。结果：VCAM-1及P-选择素在喉咽癌组织中的表达率显著高于正常口咽部黏膜组织（P〈0．01）；喉咽癌组织的MVD值显著高于正常口咽部黏膜组织（P〈O．01），MVD值与有无淋巴结转移密切相关（P〈0．01）；VCAM-1及P-选择素表达阳性组MVD值显著高于表达阴性组（P〈0．01），且VCAM-1及P-选择素表达均与MVD呈正相关（P〈0．05）；在喉咽癌淋巴结转移组中，VCAM-1及P选择素的表达呈正相关关系。结论：VCAM-1及P-选择素在喉咽癌组织中的高表达在肿瘤的浸润和转移中起重要作用，并与肿瘤血管生成有关．     

荧光定量PCR技术检测喉鳞状细胞癌标本中Skp2基因表达

目的:探讨细胞S相激酶相关蛋白(Skp2)基因在喉鳞状细胞癌发生、发展中的作用.方法:应用荧光定量逆转录PCR(FQ-PCR)技术检测40例喉鳞状细胞癌及10例癌旁正常组织中Skp2 mRNA拷贝数,并分析其与临床相关因素的关系.结果:40例喉鳞状细胞癌Skp2 mRNA中位拷贝数为6 622.54 copy/μg RNA,10例癌旁正常组织为0 copy/μg RNA,两组差异有统计学意义(P<0.01);喉鳞状细胞癌和癌旁正常组织Skp2mRNA阳性表达率分别为50%和0,差异有统计学意义(P<0.01).喉鳞状细胞癌中颈淋巴结转移组Skp2mRNA中位拷贝数为617 138.4 copy/μg RNA,颈淋巴结无转移组为0 copy/μg RNA,两组差异有统计学意义(P<0.05);喉鳞状细胞癌中颈淋巴结转移组和颈淋巴结无转移组Skp2 mRNA阳性表达率分别为100.00%和35.48%,差异有统计学意义(P<0.01).结论:Skp2基因可能与喉鳞状细胞癌颈淋巴结转移有关,FQ-PCR为一精确检测喉鳞状细胞癌Skp2 mRNA表达的方法,Skp2 mRNA表达水平可能成为预测喉鳞状细胞癌颈淋巴结转移的更加灵敏的指标.     

抑癌基因PTEN在喉鳞状细胞癌和转移淋巴结中的表达

目的研究抑癌基因(phosphatase and tensin homology deleted on chromosome ten,PTEN)在喉鳞状细胞癌、癌旁安全缘、声带息肉、转移淋巴结和无转移淋巴结中的表达,探讨其在喉鳞状细胞癌发生、发展和转移中的作用和意义,探讨喉鳞状细胞癌和转移淋巴结在分子水平的差异.方法采用免疫组织化学SP法检测了57例喉鳞状细胞癌患者的病理标本,随机抽取的27例癌旁安全切缘、22例声带息肉与57例标本中18例淋巴结转移阳性的喉状细胞鳞癌、转移淋巴结、无转移淋巴结中PTEN的表达进行检测和统计分析.结果PTEN在喉鳞状细胞癌、癌旁安全缘和声带息肉中的阳性率分别为89.5%(51/57)、88.9%(24/27)和95.5%(21/22),三者之间无显著性差异(P＞0.05),但喉鳞状细胞癌、癌旁安全缘中PTEN的阳性表达程度较声带息肉中为低,有显著性差异(P＜0.01);PTEN的阳性表达在不同性别、年龄、发病部位、分化、T分期、临床分期、淋巴结转移组间未见显著性差异(P＞0.05).无转移淋巴结中均未见PTEN的表达,18例转移淋巴结阳性患者喉鳞状细胞癌和转移淋巴结中PTEN的阳性率均为94.4%(17/18),但转移淋巴结中PTEN的表达强度较喉鳞状细胞癌高,差异有显著性(P＜0.05).结论在喉鳞状细胞癌发生的过程中,PTEN可能发生部分变异,属喉鳞状细胞癌癌变的早期分子事件,但与喉鳞状细胞癌的进展无关.喉鳞状细胞癌与转移淋巴结在分子水平存在差异.     

喉癌颈淋巴结抗肿瘤免疫状态的研究

目的　通过对肿瘤引流淋巴结中增生性滤泡反应和树突状细胞 (dendriticcell,DC)浸润密度进行定量分析 ,探讨其在喉癌患者抗肿瘤免疫反应中的作用。方法　重新制备 4 7例行选择性颈淋巴结清扫术的喉癌患者的 15 7枚颈淋巴结石蜡切片 ,用抗S 10 0、CD4 5RO和CD2 0单克隆抗体免疫组化抗生物素 生物素过氧化物酶复合物 (avidin biotinperoxidase,ABC)法显示DC和增生性滤泡的分布并检测其密度。根据增生性滤泡反应的特点进行分型研究。结果　增生型滤泡反应的程度与类型和DC浸润密度有明显的相关性。术后生存 5年以上的患者淋巴结中滤泡计数和DC浸润密度明显多于生存期少于 5年者 (P <0 0 0 1)。无淋巴结转移组患者淋巴结中的滤泡计数和DC浸润密度较有转移组亦有明显增加 (P <0 0 0 1)。具有T细胞增生型滤泡反应的患者比T细胞非增生型患者有较高的 5年生存率 (P <0 0 1)和较低的淋巴结转移率 (P <0 0 5 )。结论　颈淋巴结中增生性滤泡反应和树突状细胞的浸润反映了机体免疫系统的抗肿瘤潜能。树突状细胞的浸润密度和增生性滤泡反应的程度及分型反映了该患者的抗肿瘤免疫状态 ,可以共同作为预后判定的重要指标。     

喉癌颈淋巴结抗肿瘤免疫状态的研究

OBJECTIVE: Densities of dendritic cells (DC) and hyperplastic follicular response in cervical lymph nodes were performed to prove their roles in immune responses against cancers. METHODS: Paraffin blocks were prepared for staining with monoclonal antibodies against CD45RO, CD20 and S-100 proteins,in 157 lymph nodes obtained from elective cervical lymphadenectomy in 47 cases of laryngeal squamous cell carcinomas. RESULTS: Quantitative analysis showed that the patients who survived longer than 5 years had significant higher number of follicles and higher extent of infiltration by DCs in the lymph nodes than those who less than 5 years (P < 0.001). According to negative or positive lymph node metastasis, there were statistically significant differences between two groups (P < 0.001). The patients who possessed T cell increase type follicular reaction had significant higher five-year survival rate ( P < 0.01) and lower lymph node metastasis rate (P < 0.05) than those who possessed T cell decrease type reaction. CONCLUSION: DCs and hyperplastic follicular response may be more directly involved in the host immune reaction against tumor. The classification of follicular reaction, the densities of DCs and follicular reaction, can serve as important indicators in assessing prognosis of laryngeal carcinomas.     

S-100 protein-positive dendritic cells and CD34-positive dendritic interstitial cells in palatine tonsils

Dendritic cells (DCs) are effective antigen-presenting cells and have been shown to mature from precursor CD34-positive stromal cells (dendritic interstitial cells, DICs) or monocytes. To gain insight into the local immune response in human tonsils, we investigated immunohistochemically the presence of DCs and DICs in 17 non-hyperplastic and 13 hyperplastic tonsils. Dense infiltrates of S-100-positive DCs were noted in the majority of hyperplastic tonsils, while there were fewer in non-hyperplastic tonsils. DICs were noted specifically at the periphery in the dense hemi-capsule cap that separates the tonsil from the underlying muscle. In addition, their small number suggests that the accumulation of S-100 dendritic cells in hyperplastic palatine tonsils is achieved through migration from other sites rather than through maturation from precursors locally. Received: 19 December 2000 / Accepted: 10 April 2001     

CD44s及CD44v 6在喉鳞癌组织中的表达

目的：探讨标准型ＣＤ４４（ＣＤ４４ｓ）及变异型ＣＤ４４（ＣＤ４４ｖ６）在喉鳞癌的表达与临床病理特征的关系,及其在喉鳞癌发生发展中的作用。方法：应用免疫组化ＳＰ法检测４６例喉鳞癌及２０例癌旁正常组织中ＣＤ４４ｓ和ＣＤ４４ｖ６的表达情况。结果：ＣＤ４４ｓ在喉鳞癌淋巴结转移者（９４．４％）及Ｔ３－４者（９６．２％）的表达水平,较无淋巴结转移者（６７．９％）及Ｔ１－２者（５５．０％）高;ＣＤ４４ｖ６在喉鳞     

SOCS1沉默的树突状细胞疫苗在喉癌治疗中的实验研究

目的:研究SOCS1沉默的树突状细胞(DC)疫苗特异性抗肿瘤作用机制,并探讨RNAi技术在喉癌基因治疗中的应用前景,为DC的临床应用提供新思路。方法:以细胞因子GM-CSF、IL-4和TNF-α体外诱导扩增外周血单核细胞来源的DC,倒置显微镜下观察DC形态特征;构建RNAi载体转染DC,Western blot检测SOCS1的表达情况,筛选抑制SOCS1表达的有效靶序列;流式细胞术检测DC表面分子CD83、CD86和HLA-DR的表达;ELISA法分析上清中IFN-γ的含量;MTT法评估DC刺激T细胞增殖的能力及诱导细胞毒性T细胞(CTL)的杀伤活性。结果:DC体外诱导培养成功;设计的RNAi载体经测序验证无误。干扰序列5可显著下调SOCS1表达水平;SOCS1沉默联合喉癌Hep-2抗原致敏的DC可显著上调表面分子标志CD83(85.61±0.96)%、CD86(96.86±1.20)%和HLA-DR(98.02±0.94)%的表达;该组DC能有效刺激T细胞增殖,增加IFN-γ的分泌量,最终增强CTL的特异性杀伤作用,效靶比为50∶1时其杀伤活性与对照组之间的差异有统计学意义(P<0.01)。结论:SOCS1沉默并负载喉癌Hep-2抗原的DC疫苗可以产生高效而特异性的抗喉癌免疫应答。     

Dendritic cells in selected head and neck tumors

Specimens from 17 head and neck tumor patients were immunohistochemically stained with monoclonal antibodies against HLA-DR, CD1a, RFD1, LAG, CD3, CD4, CD8, CD45RO, CD68, and cytokeratin to identify the nature and distribution of dendritic cells (DCs), T cells, and macrophages. Small numbers of DCs were present in all but 2 specimens. They were located between the tumor cells and in the stroma, especially in areas of inflammatory cell infiltration. Variable numbers of T lymphocytes (cytotoxic and memory type) occurred in the same locations. Numerous macrophages were found in the epithelium, in the stroma, and in the vicinity of tumor cells. The presence of DCs in head and neck tumors indicates that the organism has activated the immune surveillance system and is trying to present tumor antigens. Considering the sparsity of DCs in the malignant tissues, the T cell response can be only limited.     

Anti-tumor immunity against nasopharyngeal carcinoma by means of LMP2A-specific cytotoxic T lymphocytes induced by dendritic cells

OBJECTIVE: Adoptive immunotherapy with specific cytotoxicity T lymphocytes (CTLs) induced by dendritic cells (DCs) pulsed with tumor antigens plays a crucial role in the immunity against tumor. The purpose of this study was to assess the feasibility and efficacy of latent membrane protein 2A (LMP2A)-specific CTLs immunity against nasopharyngeal carcinoma (NPC) in vitro and in vivo. METHODS: DCs were generated by culturing the monocytes purified from human peripheral blood mononuclear cells (PBMCs) in cytokine cocktail containing granulocyte/macrophage colony-stimulating factor (GM-CSF), interleukin-4 (IL-4), and tumor necrosis factor-alpha (TNF-alpha). The phenotype of mature DCs was analyzed by fluorescence activated cell sorter (FACS). Mature DCs transfected with EBV-LMP2A recombinant adenovirus were co-cultured with autologous PBMCs to induce LMP2A-specific CTLs. The expression of the surface antigens such as CD3, CD4, CD8 and CD56 on CTLs were detected by FACS. The specific cytotoxicity of CTLs on target CNE cells expressing EBV-LMP2A was confirmed using cytotoxicity assay. The anti-tumor effect of LMP2A-specific CTLs in vivo was assessed in the mice tumor models implanted with CNE cells expressing EBV-LMP2A. RESULTS: Mature DCs expressed typically morphologic characteristics and high level of surface markers (CD1a, CD83, CD86, CD80 and HLA-DR). LMP2A-transfected DCs could induce LMP2A-specific CTLs consisting of a majority of CD4+ and CD8+ T cells. Cytotoxicity assay confirmed that the LMP2A-specific CTLs displayed significant cytotoxicity on target CNE cells compared with the controls. The study in vivo demonstrated that the treatment using these specific CTLs retarded the growth of established tumor in the treated mice. CONCLUSION: These findings suggest that DCs transfected with EBV-LMP2A recombinant adenovirus can elicit LMP2A-specific CTLs that have a specific killing effect on NPC in vitro and in vivo. The results provide experimental basis for the further immunotherapy of NPC in clinical trails.     

Dendritic cells in precancerous lesions of the larynx

OBJECTIVES: Hyperplastic lesions of the laryngeal mucosa can eventually develop into squamous cell carcinoma The relationship between dendritic cell infiltration of head and neck cancers and prognosis is well known. Surprisingly, data regarding dendritic cell infiltration in precancerous lesions are not available today. It was the purpose of our study to extend these observations and to investigate in more detail the density and distribution of dendritic cells in pre-cancerous lesions. STUDY DESIGN: Retrospective survey by immunohistochemistry. METHODS: For this study we investigated paraffin-embedded tissue sections of 41 specimens. Histological diagnosis disclosed precancerous lesions of the larynx in 34 cases and in 7 cases, squamous cell carcinoma Immunohistochemical study was performed using antibodies against the cell surface markers S-100, HLA-DR, CD20, CD45 RO, CD45 RA, and Lag. Typical dendritic cell distributions of the immunostained specimens were photographed and measured on a quantitative basis. The medical histories of the patients were then analyzed retrospectively. RESULTS: HLA-DR+ cells could be detected in 14 of 16 cases in mild dysplastic lesions. The infiltration of the dysplastic lesions was sparse compared to cases with higher-graded dysplastic lesions. The distribution patterns of the dendritic cells in specimens with severe dysplastic lesions, but squamous cell carcinoma were extremely similar and markedly different from those in grades I and II specimens. Memory T lymphocytes (CD45 RO+) were detected more often in the group with severe dysplastic lesions (8 of 9 cases) than in the group with squamous cell carcinoma (3 of 8 cases). The inverse became evident for CD20 and CD45 RA immunolabeling. CONCLUSIONS: Few dendritic cells were found in the precancerous lesions. This may suggest that these early lesions (grades I and H) are not efficiently monitored by the immune system. Therefore they may develop into carcinomas unimpaired by cytotoxic T cells. As the degree of malignancy rises (grade III), more dendritic cells infiltrate the tumor.     

喉癌颈部淋巴结转移的MRI诊断

目的：探讨ＭＲＩ在喉癌颈部淋巴结转移术前诊断中的作用。方法：对１９例（２４侧）喉癌患者的颈部术前触诊、ＭＲＩ扫描及颈清扫标本病理检查结果进行了对比研究。结果：喉癌颈辨别志移淋巴结在ＭＲＩ影像上基本呈圆形或类圆型,个别可表现为数个淋巴结的融合;ＭＲＩ和临床触诊诊断颈部淋巴结转移的敏感率、特异率和准确率分别为８５．７％、９０．０％、８７．５％和６４．３％、７０．０％、６６．７％,ＭＲＩ诊断的准确率明显