鼻NK/T细胞淋巴瘤瘤细胞分化状态的探讨

目的 探讨鼻自然杀伤(NK)／T细胞淋巴瘤肿瘤细胞的分化状态。方法 收集已确诊的88例鼻NK／T细胞淋巴瘤的临床资料。免疫组织化学染色选用的抗体有：T细胞分化抗原(CD3ε、CD5、CD1a)、NK细胞相关抗原(CD56、CD57),还有CD34和CD38抗原。结果(1)病变部位以鼻腔最常见,其次为咽部,主要体征为溃疡或黏膜糜烂。本组88例鼻NK／T细胞淋巴瘤中有62例(70．5％)之瘤细胞呈弥漫性增生和浸润,瘤细胞中等大小者有71例(80．7％);(2)88例NK／T细胞淋巴瘤中,T细胞标记CD3ε阳性者78例(88．6％),CD5阳性者56例(63．6％),NK细胞标记CD56阳性者25例(28．4％);CD57、CD1a、CD34和CD38均为阴性。结论 鼻NK／T细胞淋巴瘤瘤细胞的分化可能已超越前体细胞阶段,但尚未达到成熟T淋巴细胞或NK细胞阶段。     

LAT和CD99在T淋巴母细胞淋巴瘤中的表达及意义

目的 探讨LAT和CD99在T淋巴母细胞淋巴瘤(precursor T lymphoblastic lymphoma,T-LBL)中表达的价值.方法 对37例T-LBL应用免疫组织化学EnVision二步法进行LAT和CD99标记.同时选取15例其他病例作为对照:3例B淋巴母细胞淋巴瘤,4例非特殊类型外周T细胞淋巴瘤,3例结外鼻型NK/T细胞淋巴瘤,5例淋巴结反应性增生.结果 37例T-LBL均表达LAT和CD99;4例外周T细胞淋巴瘤及3例鼻型结外NK/T细胞淋巴瘤弥漫表达LAT,不表达CD99;3例B淋巴母细胞淋巴瘤均表达CD99,但不表达LAT;5例反应性增牛淋巴结的T细胞区LAT阳性,淋巴结皮、髓质区均不表达CD99.结论 联合检测LAT和CD99有助于T-LBL的诊断和鉴别诊断.     

肺黏膜相关淋巴组织边缘区B细胞淋巴瘤及良性淋巴组织增生性疾病的临床病理分析

目的 研究肺原发性黏膜相关淋巴组织边缘区B细胞(MALT)淋巴瘤及良性淋巴组织增生性疾病的临床病理形态、免疫组织化学表型和B细胞重链基因重排,比较肺MALT淋巴瘤和良性淋巴组织增生性疾病的差异.方法 回顾性的分析原发性肺MALT淋巴瘤13例,7例肺良性淋巴组织增生性疾病资料.对标本行常规HE染色,EnVision免疫组织化学染色(抗体包括AE1/AE3、CD20、CD79α、CD3、CD5、CD10、CD21、bel-2、bcl-6、cyclinD-1)及免疫球蛋白重链IgH基因重排检测.结果 13例肺MALT淋巴瘤,细胞成分多样,分别由不同比例的小淋巴细胞样细胞、中心细胞样细胞、单核样B细胞组成,常伴有浆细胞分化.肿瘤细胞以弥漫性和滤泡边缘区排列为主,常见反应性淋巴滤泡和滤泡中心的植入.肿瘤细胞呈串珠状直接侵犯肺泡间隔和沿支气管血管束向周边及肺膜扩散.MALT淋巴瘤中,均未见坏死.9例可见肿瘤细胞侵犯血管壁,6例可见胸膜累及,2例肺门淋巴结侵犯.9例肺MALT淋巴瘤可见淋巴上皮样病变,免疫组织化学显示上皮细胞内的淋巴细胞CD20阳性,CD3阴性.7例肺良性淋巴组织增生性疾病,2例可见淋巴上皮样病变,免疫组织化学显示,其淋巴上皮样病变内的淋巴细胞,部分CD20阳性,部分CD3阳性.9例肺MALT淋巴瘤进行了免疫球蛋白重链IgH基因重排,8例阳性;7例良性淋巴组织增生性疾病均为阴性.结论 肺MALT淋巴瘤在细胞组成和排列上与其他部位结外MALT淋巴瘤相同,肿瘤细胞呈串珠状直接侵犯肺泡间隔和沿支气管血管束向周边及肺膜扩散.在肺内淋巴上皮样病变常见于MALT淋巴瘤,并有助于诊断,但并非其特异性病变,一些肺的反应性淋巴组织增生也可出现,用免疫组织化学有助于区别两种病变.免疫球蛋白重链IgH基因重排可以帮助鉴别肺MALT淋巴瘤和良性淋巴组织增生性疾病.     

C型凝集素样自然杀伤(NK)细胞受体在结外鼻型NK/T细胞淋巴瘤中表达及意义

目的 探讨C型凝集素样自然杀伤(NK)细胞受体CD94和NKG2在结外鼻型NK/T细胞淋巴瘤中的表达及意义.方法 运用逆转录聚合酶链反应(RT-PCR)检测C型凝集素样NK细胞受体CD94和NKG2在经组织形态、免疫组织化学、EB病毒原位杂交及T细胞受体PCR克隆性重排分析确诊的21例结外鼻型NK/T细胞淋巴瘤以及对照组同部位B细胞淋巴瘤8例、淋巴结外周T细胞淋巴瘤(PTCL)10例、脾脏5例、胸腺5例和慢性炎性鼻黏膜5例组织中的表达情况并进行随访.结果 21例结外鼻型NK/T细胞淋巴瘤具有典型的形态学改变,表达CD3ε、CD56和细胞毒蛋白,TCR重排阴性,20例EB病毒阳性;RT-PCR扩增结果显示,在21例结外鼻型NK/T细胞淋巴瘤中,18例(85.7%)CD94呈阳性表达;NKG2总阳性率为95.2%(20/21),各亚基表达阳性率依次为NKG2A/2B(85.7%)、NKG2D(61.9%)、NKG2F(14.3%)、NKG2C,/2E(4.8%).对照组中PTCL和B细胞淋巴瘤均不表达CD94和NKG2,仅2例脾脏和2例慢性炎性鼻黏膜组织表达CD94,1例脾脏组织表达NKG2A/2B,1例胸腺组织表达NKG2D.CD94和NKG2在结外鼻型NK/T细胞淋巴瘤中的表达与T细胞淋巴瘤和B细胞淋巴瘤比较,差异均有统计学意义(P均<0.01).CD94和NKG2同时表达于17例结外鼻型NK/T细胞淋巴瘤,共表达率为81.0%(17/21).结论 CD94和NKG2在结外鼻型NK/T细胞淋巴瘤中呈特异性和顺序性表达,提示多数病例肿瘤细胞处于活化和功能NK细胞阶段.对这些分子的检测有可能成为NK细胞源性淋巴瘤诊断的重要手段.     

树突状细胞扩增抗原特异性CD4+ CD25+调节性T细胞研究进展

CD4+CD25+调节性T细胞(Tr)是同时具有免疫低反应性和免疫抑制性功能两大特征的T细胞.研究证实,CD4+ CD25+ Tr在抑制器官特异性自身免疫性疾病及GVHD是抗原特异性的,因此,应用器官特异性而不是多克隆性的Tr将大大促进以Tr为基础的免疫治疗.而具有调节活性的CD4+ CD25+ Tr仅占人类外周血CIM+ T细胞的1%～2%,因此,研究体外大量扩增的方法 对于以Tr基础的治疗至关重要.研究表明,树突状细胞(DC)作为机体强有力的专职抗原递呈细胞可以扩增具有抗原特异性的CD4+ CD25+ Tr且能增加后者的抑制活性,这为治疗自身免疫性疾病及GVHD提供了新的治疗前景.     

流式细胞术在抗原异常表达淋巴瘤/白血病诊断中的应用

目的 探讨流式细胞免疫分型在抗原异常表达淋巴瘤诊断及鉴别诊断中的作用。方法 应用流式细胞术对伴有抗原异常表达的淋巴瘤3例,B淋巴细胞性白血病8例,T淋巴细胞性白血病1例及伴有淋巴细胞分化抗原表达的急性非淋巴细胞白血病17例,急性粒细胞白血病累及淋巴结1例的免疫表型进行回顾性分析,每例均作胞质CD3ε、CD79a、髓过氧化物酶(MP0)的En Vision两步法染色。结果 11例B细胞淋巴瘤／白血病胞质CD79a阳性,胞质CD3ε及MP0阴性,其中5例伴CD5表达,2例同时伴CD5及1-2项髓系分化抗原表达;1例T淋巴细胞白血病胞质CD3ε阳性,胞质CD79a及MP0阴性,伴CD13、CD33表达;18例急性非淋巴细胞白血病(包括1例急性粒细胞白血病累及淋巴结)胞质髓过氧化物酶(MP0)均阳性,胞质CD3ε及C1979a均阴性,其中8例(包括1例急性粒细胞白血病累及淋巴结)伴T细胞分化抗原表达,8例伴B细胞分化抗原表达,2例同时伴T细胞及B细胞分化抗原表达。结论流式细胞免疫分型不仅能发现淋巴瘤／白血病抗原异常的表达,而且可通过表面免疫标记及胞质CD3s、CD79a、MP0的表达来确定抗原异常表达淋巴瘤／白血病的细胞来源,对抗原异常表达淋巴瘤／白血病的诊断及鉴别诊断具有十分重要价值。     

侵袭性NK细胞白血病的临床病理学特点

目的 探讨侵袭性NK细胞白血病(ANKL)的临床病理学特点.方法 回顾性分析10例ANKL患者的临床病理档案资料,全部病例均行全血细胞计数以及外周血涂片、骨髓穿刺与骨髓活检标本的形态学观察.用流式细胞学(FCM)及免疫组织化学(EliVision法)进行免疫表型分析.聚合酶链反应(PCR)法检测T细胞受体(TCR)γ基因重排.结果 10例患者中,最常见的血液学异常为贫血(7例)与血小板减少(9例).6例外周血涂片可见大颗粒淋巴细胞.骨髓穿刺涂片示8例淋巴细胞比例增高(＞20.0％).6例可见大颗粒淋巴细胞.骨髓活检切片示轻度浸润5例,中度浸润3例,重度浸润2例.骨髓切片中8例为间质型浸润,2例呈弥漫型浸润,4例可见噬血现象(吞噬成熟红细胞).免疫表型方面,FCM检测示全部病例为CD2+sCD3- CD4- CD56+CD57-.9例CD7、5例CD16、4例CD8和1例CD5阳性.8例行免疫组织化学相关抗原检测:cCD3 4例、CD566例、T细胞内抗原1(TIA-1)6例、颗粒酶B4例和穿孔素2例阳性.10例TCRγ基因重排检测均为胚系构型.结论 ANKL是一种NK细胞来源的高度侵袭性淋巴组织肿瘤,需进行全面的外周血与骨髓的形态学、免疫表型以及分子遗传学检测才能确诊,需注意与多种NK细胞与T细胞淋巴瘤鉴别.     

流式细胞术检测CD4~+ T细胞内p24抗原辅助诊断HIV-1的感染

目的探讨流式细胞术(FCM)检测CD4+T淋巴细胞内p24抗原对人免疫缺陷病毒1(HIV-1)感染的辅助诊断价值。方法通过FCM检测HIV-1感染者和正常人(阴性对照)CD4+T淋巴细胞内HIV-1 p24抗原,建立方法。收集HIV-1早期感染者样本,用FCM检测CD4+T淋巴细胞内p24抗原,ELISA检测血浆p24抗原以及nest-PCR检测核酸,比较3种方法的检测结果。结果感染者p24+CD4+T淋巴细胞比例明显高于相应阴性对照(P0.01);感染者组p24+CD4+T淋巴细胞比例95%百分位数为1.92%,确立阴阳界值为2.00%。CD4+T淋巴细胞计数≤350个/μL的感染者p24+CD4+T淋巴细胞比例明显高于相应CD4+T淋巴细胞计数350个/μL的感染者(P0.05)。FCM检测HIV-1早期感染者CD4+T淋巴细胞内p24抗原结果显示,该方法的检验效能优于ELISA检测血浆p24抗原,和核酸检测相当。结论 FCM检测CD4+T淋巴细胞内p24抗原能及时发现HIV-1早期感染,在HIV-1感染的辅助诊断方面有一定的应用价值。     

凋亡抑制蛋白survivin在活化T细胞中的表达及其意义

目的: 探讨survivin在活化T细胞的表达及其意义。方法: 经丝裂原与同种抗原刺激激活T细胞, 免疫细胞化学染色后观察survivin和增殖细胞核抗原(PCNA)的表达。用流式细胞术检测CD3、CD25、Survivin的表达及细胞凋亡。给BALB/c裸鼠输注C57BL/6小鼠脾细胞后第 4~7天, 观察肝脏内T细胞浸润和survivin的表达。结果: ConA刺激后培养的脾细胞可表达survivin(表达不局限于G2 /M期 )。survivin 细胞为T细胞, T淋巴母细胞可同时表达CD25和survivin。survivin 细胞中仅部分细胞表达CD25。ConA刺激淋巴细胞后第 6天, 凋亡细胞的百分率明显增加 ( 22. 90% vs5. 23%P<0. 001)。于BALB/c裸鼠输注C57BL/6小鼠的脾细胞后,于第 4~7天, 在BALB/c裸鼠肝脏中可观察到T细胞浸润并表达Survivin。结论: T细胞激活后可表达survivin, 故可作为活化T细胞的标志。T细胞持续表达survivin, 需要在体内与抗原持续接触。     

儿童种痘水疱病样淋巴组织增生性疾病临床病理分析

目的探讨儿童种痘水疱病样淋巴组织增生性疾病的临床病理学特征、诊断、鉴别诊断及预后。方法收集6例儿童种痘水疱病样淋巴组织增生性疾病,观察其临床表现、组织病理学、免疫表型及相关分子病理检测,收集随访资料并复习相关文献。结果男童4例,女童2例,病史1个月~4年。临床均表现为反复发作的水痘样疱疹并伴发热。镜下见表皮内有水疱形成或伴坏死,真皮层至皮下脂肪层内有数量多少不等的淋巴样细胞浸润,细胞可为轻至中度异型,多位于小血管及附属器周围。免疫组化示异型细胞可表达CD2、CD3、CD5、CD7、CD43、CD4、CD8、TIA-1,仅1例表达CD56,所有病例均不表达CD20、Pax-5。Ki-67增殖指数平均42.3%。5例EBER原位杂交检测呈阳性,2例TCR克隆性重排阳性。5例获得随访,1例患儿死亡。结论儿童种痘水疱病样淋巴组织增生性疾病临床较为少见,与慢性活动性EB病毒感染密切相关,临床过程可能为独立的疾病谱系,其性质可为良性、交界性及恶性。病理诊断需密切结合临床表现。     

Aberrant phenotypes in Kikuchi’s disease

Initial reports emphasized the immunophenotypic similarities between benign and malignant T cell populations, while some previous studies indicating that aberrant T-cell antigen loss is a good marker for detecting malignant T-cell proliferation. Recently, we found a very interesting and thought-provoking phenomenon: In benign disease-28 of 38 (73.7%) cases of Kikuchi’s disease also showed aberrant phenotypes with loss of pan-T cell antigens, which makes the differential diagnosis between Kikuchi’s disease and T cell lymphoma more challenging. In our study, 38 cases of Kikuchi’s disease and 30 cases of reactive lymphoid hyperplasia (RLH) were studied by EliVision immunohistochemical staining. As well as TCR gene rearrangement using PCR was negative in 10 tested cases of the Kikuchi’s disease. Among these cases, the most common antigen deficiency was CD5 (22 cases), then CD7 (11 cases), CD2 (8 cases) and CD3 (2 cases). Compared with proliferative and xanthomatous types of Kikuchi’s disease, antigens tended to be lost in necrotizing type. Based on follow-up data, a correlation was not found between the occurrence of aberrant phenotypes and prognosis. In RLH, obvious pan-T cell antigen loss was also not found. In conclusion, this is the first study to demonstrate distinct patterns of antigen loss in Kikuchi’s disease, suggesting that T cell antigen loss is not reliable as an auxiliary diagnostic standard for T cell lymphoma.     

Immunophenotypic and antigen receptor gene rearrangement analysis in T cell neoplasia.

The author reviews the immunophenotypic profiles displayed by the major clinicopathologic categories of T cell neoplasia, the immunophenotypic criteria useful in the immunodiagnosis of T cell neoplasia, and the contributions made by antigen receptor gene rearrangement analysis to the understanding of T cell neoplasia. Neoplasms belonging to distinct clinicopathologic categories of T cell neoplasia often exhibit characteristic immunophenotypic profiles. Approximately 80% of lymphoblastic lymphomas and 20% of acute lymphoblastic leukemias express phenotypes consistent with prethymic and intrathymic stages of T cell differentiation, including intranuclear terminal deoxynucleotidyl transferase. Cutaneous T cell lymphomas of mycosis fungoides type usually express pan-T cell antigens CD2, CD5, and CD3, often lack the pan-T cell antigen CD7, and usually express the mature, peripheral helper subset phenotype, CD4+ CD8-. Cutaneous T cell lymphomas of nonmycosis fungoides type and peripheral T cell lymphomas often lack one or more pan-T cell antigens and, in addition, occasionally express the anomalous CD4+ CD8+ or CD4- CD8- phenotypes. T gamma-lymphoproliferative disease is divisable into two broad categories: those cases that are CD3 antigen positive and exhibit clonal T cell receptor beta chain (TCR-beta) gene rearrangements and those cases that are CD3 antigen negative and exhibit the TCR-beta gene germline configuration. Human T cell lymphotropic virus-I (HTLV-I) associated Japanese, Carribean, and sporadic adult T cell leukemia/lymphomas usually express pan-T cell antigens, the CD4+ CD8- phenotype, and various T cell-associated activation antigens, including the interleukin-2 receptor (CD25). Immunophenotypic criteria useful in the immunodiagnosis of T cell neoplasia include, in increasing order of utility, T cell predominance, T cell subset antigen restriction, anomalous T cell subset antigen expression, and deletion of one or more pan-T cell antigens. Only in exceptional circumstances do normal, non-neoplastic T cell populations express the CD4- CD8- or the CD4+ CD8+ phenotype and/or lack one or more pan-T cell antigens. T cell receptor beta chain gene rearrangement analysis represents an accurate, objective, and sensitive molecular genetic marker of T cell lineage and clonality that allows discrimination among non-T cell, polyclonal T cell and monoclonal T cell populations. Non-T cells exhibit the TCR-beta gene germline configuration.(ABSTRACT TRUNCATED AT 400 WORDS)     

乙型肝炎病毒感染者外周血CD4+T细胞CD25、CD127不同亚群表达的检测及临床意义

目的 研究乙型肝炎病毒(HBV)感染者外周血CD4+T细胞表面CD25、CD127不同亚群的表达情况及临床意义。方法 用荧光抗体CD127-FITC、CD4-PECY5、CD25-PE标记T细胞。用流式细胞仪分别测定53例慢性乙型肝炎患者和53例HBV携带者CD4+T细胞表面CD25、CD127不同亚群的表达情况。对20例HBV-DNA阳性乙型肝炎病毒感染者干扰素治疗进行随访。结果与健康对照组[7.26％(6.15％,8.50％)]比较,慢性乙型肝炎患者[11.23％(9.10％,14.86％)]、HBV携带者[13.34％( 10.73％,18.90％)]CD25-CD 127-均显著升高,差异均有统计学意义(Q=4.559,P＜0.05;Q=6.230,尸＜0.05)。慢性乙型肝炎患者CD25hiCD127low/-[8.78％ (7.62％,10.44％)]显著高于健康对照[6.76％(5.73％,8.23％)]和HBV携带者[6.99％(5.77％,9.34％)],差异均有统计学意义(Q=3.497,P＜0.05;Q=3.103,P＜0.05)。HBV-DNA阳性组CD25-CD127-显著低于阴性组,两者差异有统计学意义[(12.92±5.20)％比(15.78±6.91)％,t=2.290,P=0.024],而CD25+/-CD127+显著高于阴性组,两者差异有统计学意义[(79.27±5.20)％比(76.02±7.04)％,t=2.194,P=0.030]。与治疗前比较,干扰素治疗12周CD25hiCD127low/-显著升高[(9.29±2.51)％比(11.08±2.38)％,t=2.820,P=0.011],而CD4+CD25-CD127-显著降低,两者差异有统计学意义[(13.86±5.72)％比( 10.86±3.60)％,t=2.469,P=0.024]。结论 HBV感染者外周血CD4+T细胞中CD25-CD127-亚群的表达与病毒的感染和清除有关;CD25hiCD 127low/-亚群的表达升高与发病有关。外源性干扰素可升高CD25hiCD127low/-的表达,降低CD25-CD127-的表达,从而抑制免疫反应。     

儿童癫痫患者外周血B淋巴细胞CD20的表达

目的 探讨癫痫患儿外周血B淋巴细胞CD20表达的变化与癫痫发作的关系.方法 应用流式细胞仪测定本院2008年1月至2010年12月就诊的620例儿童癫痫患者外周血B淋巴细胞CD20的表达,并与健康对照组(n=36)进行比较.同时分析96例儿童癫痫患者(症状性癫痫患者37例,特发性癫痫患者59例)应用静脉注射免疫球蛋白(IVIG)治疗前后的B淋巴细胞CD20表达的改变,并评价IVIG治疗各型癫痫的有效率.结果 癫痫儿童外周血B淋巴细胞CD20+比例较健康对照组明显升高[(21.50±8.41)％比(16.13±4.19)％,P＜0.05].96例儿童癫痫患者经IVIG治疗6个月后外周血B淋巴细胞CD20+细胞比例较治疗前下降[(16.74±5.12)％比(21.61±8.03)％,P＜0.05].IVIG治疗癫痫总体有效率为76.04％(73/96),症状性癫痫治疗有效率为86.49％ (32/37),特发性癫痫治疗有效率为69.49％(41/59).结论 儿童癫痫患者存在B淋巴细胞功能异常,IVIG治疗能改善癫痫患儿的细胞免疫功能.     

Expression of hyaluronic acid and its receptors, CD44s and CD44v6, in normal, hyperplastic, and neoplastic endometrium

The interaction between epithelial tumor cells and their surrounding stroma is important in tumor progression and metastasis. This is accomplished through a number of transmembrane receptors that interact with stromal extracellular matrix molecules. One of these receptors, CD44, binds to extracellular matrix component hyaluronic acid (HA). The purpose of this study was to evaluate the significance of HA, CD44s, and CD44v6 in benign, hyperplastic, atypical, and malignant endometrial epithelia. Archival paraffin-embedded cell blocks from proliferative endometrium (n = 11), secretory endometrium (n = 12), simple hyperplasia (n = 13), complex hyperplasia without atypia (n = 9), complex hyperplasia with atypia (n = 17), and adenocarcinoma (n = 21) were stained for HA, CD44s, and CD44v6. HA was detected throughout the normal menstrual cycle but was more intense during the secretory phase. Only during the secretory phase was CD44s expressed in the stromal cells in 11 cases (92%), whereas CD44v6 was detected in glandular epithelium in 9 (75%). CD44s was expressed in the glandular epithelium in 2 (15%) cases of simple hyperplasia, 4 (44%) of complex hyperplasia without atypia, 14 (82%) of complex hyperplasia with atypia, and in 16 (76%) of adenocarcinoma. CD44v6 was expressed in the glandular epithelium in 1 (11%) case of complex hyperplasia without atypia, 17 (100%) cases of complex hyperplasia with atypia, and in 18 (86%) cases of adenocarcinoma, but in none of the cases of simple hyperplasia. The endometrial stromal cells expressed CD44v6 in 1 (8%) case of simple hyperplasia, 6 (67%) of complex hyperplasia without atypia, 8 (47%) of complex hyperplasia with atypia, and in 3 (14%) of adenocarcinoma. We concluded that in the normal menstrual cycle, the timing of peak staining of HA and CD44s in the stroma and the up-regulation of CD44v6 in secretory glands are coincident with the period in which the endometrium is most receptive to embryo implantation. HA is more abundant in the stroma adjacent to the tumor, suggesting that interactions between tumor cells and stromal HA promote tumorigenesis. With progression from hyperplasia and with increasing atypia to adenocarcinoma, levels of stromal HA, glandular CD44v6, and glandular and stromal CD44s all increase. Thus, HA and CD44 are both involved in the development and progression of endometrial cancer.     

Primary gastric T-cell lymphoma of suppressor-cytotoxic (CD8+) phenotype: discordant expression of T-cell receptor subunit beta F1, CD7, and CD3 antigens.

Primary gastric T-cell lymphomas are rare neoplasms, and all but one of the previously phenotyped cases have shown a helper-inducer phenotype. The present case is the second reported case of a primary gastric T-cell lymphoma of suppressor-cytotoxic phenotype. The tumor histology was similar to that described in some forms of node-based peripheral T-cell lymphomas. Phenotypic analysis revealed low expression of pan-T marker CD7, reduced expression of CD3, but higher density and frequency of expression of CD8 antigens that could be predicted on the basis of the pan-T markers. Natural killer cell (NK) related markers CD16, HNK-1 and NKH-1 were not expressed by the neoplastic cells. T-cell receptor (TCR) beta subunit expression was detected on fewer cells than would have been predicted on the basis of CD3 and CD8 expression, and TCR delta chain expression was undetectable.     

CD44+/CD24-细胞在乳腺癌组织及细胞系中的数量与分布

目的 检测CD44+/CIY24-细胞在乳腺癌组织及细胞系中的分布及数量,探讨其与乳腺癌常用标志物表达和乳腺癌分子亚型的关系.方法 采用免疫组织化学SP双染及单染法,分别检测了60例乳腺浸润性导管癌中的CD44及C1724的共表达情况和ER、PR、HER2、人雌激素诱导蛋白PS2、bcl-2、nm23的单独表达情况,同时检测了三种乳腺痛细胞系(MCF-7、MDA-MB-468及MDA-MB-231)中CD44及CD24的表达情况.结果 不同病例标本中CD44+/C1724-细胞的数量差异较大,分布无明显规律,总阳性率为65.0%;CD44+/CD24-细胞数量与患者年龄、肿瘤大小、淋巴结转移情况及ER、PR、HER-2、人雌激素诱导蛋白PS2、bcl-2、nm23表达情况无关(P均>0.05);CD44+/CD24-细胞数量与乳腺癌分子亚型无关.CD44+/CIY24-细胞在MCF-7、MDA-MB-468及MDA-MB-231细胞系中的比例分别为<1%、5%及>80%.结论 CD44+/CD24-细胞存在于部分乳腺癌组织及细胞系中,其数量及分布与乳腺癌的分子亚型和临床病理参数无直接关系.     

CD80 expression is decreased in hyperplastic lymph nodes of HIV+ patients

A centrofollicular hyperplasia is present within secondary lymphoid organs during all the asymptomatic phase of the HIV disease. Although this hyperplasia has been well characterized by histological studies, the nature of the phenotypic alterations in B cell populations occurring within HIV+ lymphoid organs remains to be established. By immunohistochemistry, we thus investigated whether a particular germinal center (GC) B cell population was increased during HIV-induced hyperplasia and whether any phenotypic change was specific to HIV-1 infection. As compared to normal tonsils (three cases) and HIV- hyperplastic lymph nodes (eight patients), we observed a loss of GC polarization in all HIV+ sections (11 patients), with no more delineation between dark and light zones, as shown by Ki67, CD10, CD77, CD95 and CD86 staining. In contrast to CD86 expression which remained as intensive in HIV+ as in HIV- lymph nodes, CD80 staining was strongly decreased in GC of HIV+ lymph nodes but not in their extrafollicular zones. The loss of CD80 expression from CD19+ B cells was also observed by cytometric analysis of cell suspensions of three HIV+ patients. Although we found no evidence of an increase in a particular GC B cell subset in HIV-1-induced hyperplasia, the strong GC disorganization observed may induce impaired cell-cell interactions and thus participate in the loss of CD80 antigen. In contrast to HIV- situations where CD80 and CD86 was similarly expressed on B cells, the lower level of CD80 expression in HIV+ GC may favor Th2 T cell responses through CD86-CD28 interactions.      

人免疫缺陷病毒感染者/艾滋病患者浅表淋巴结肿大与CD4+T淋巴细胞计数的相关性

目的 探讨人免疫缺陷病毒感染者/艾滋病患者（简称HIV感染者/AIDS患者）浅表淋巴结肿大的病理改变及其与CD4+T淋巴细胞计数的相关性。方法 对1066例HIV感染者/AIDS患者浅表淋巴结肿大的发生情况及其外周血CD4+T淋巴细胞计数进行分析;并对浅表淋巴结肿大患者行淋巴结活检。结果 在1066例HIV感染者/AI...     

De novo CD5 positive diffuse large B-cell lymphomas with bone marrow involvement in Korean

In CD5 positive (CD5+) mature B-cell lymphomas, newly recognized CD5+ diffuse large B-cell lymphoma (DLBCL) has been characterized by aggressive features. We studied twenty-five cases with CD5+ lymphomas involving bone marrow. Eleven cases were diagnosed as chronic lymphocytic leukemia, six cases were diagnosed as mantle cell lymphoma (MCL), and three cases with morphologic characteristics of MCL and without both the cyclin D1 expression and IGH/CCND1 rearrangement were unclassifiable. The remaining five cases, showing large to medium-sized lymphoid cells with prominent nucleoli and a moderate amount of cytoplasm, were diagnosed as DLBCL. Five DLBCL cases were positive for CD5, CD20, surface immunoglobulin, but negative for CD23. Patients with CD5+ DLBCL showed a high age of onset (median, 68 yr) and two patients expired one month after the diagnosis. Since CD5+ DLBCL forms a distinct subgroup of DLBCL, a study of CD5 expression in DLBCL would be helpful to predict prognosis and to determine future therapeutic strategy. To the best of our knowledge, this is the first report on de novo CD5+ DLBCL in Koreans.