Epstein-Barr virus-associated peripheral T-cell lymphoma of activated CD8 phenotype

Two childhood cases are reported of peripheral T-cell lymphoma; the neoplastic cells expressed activated CD8 (T8) phenotype and contained Epstein-Barr viral (EBV) DNA. Both patients had an aggressive and rapid clinical course despite chemotherapy. Elevated titers of antibodies to EBV-viral capsid antigen (greater than 640) and early antigen (greater than 10) were found in both patients. Histology revealed pleomorphic immunoblastic lymphoma with extensive necrosis in one case and an angioimmunoblastic lymphadenopathy-like pattern containing Reed-Sternberg-like giant cells in the other. Southern blot hybridization studies showed clonal rearrangement of the T-cell-receptor beta gene in both cases, and a cytogenetic study on one case revealed clonal structure abnormality involving chromosomes 1, 6, 7, 10, and 19. Analysis of the tumor DNA showed a high copy number of EBV genome per cell compared with that of Raji and Marmoset B 95.8 lines; the study for human T-cell leukemia virus type I was negative. The EBV genome was found by in situ hybridization in the tumor nuclei in both cases. In addition to Burkitt's lymphoma, T-cell lymphoma of the helper phenotype, and Hodgkin's disease, EBV can contribute to the development of CD8-positive aggressive T-cell lymphoma.     

Immunophenotypic and genotypic characterization of nasal lymphoma with polymorphic reticulosis morphology.

Nasal lymphoma with polymorphic reticulosis (PR) morphology is now categorized as T/natural killer (T/NK) cell lymphoma. In this study, immunophenotypes and genotypes of proliferating cells in 21 cases with PR were examined. The patients included 13 men and 8 women ranging in age from 20 to 74 (median 37) years. All patients presented with lesions in the upper respiratory tract, mostly in the nasal cavity. Histological specimens obtained from the primary lesions (19 cases) and metastatic cervical lymph nodes (2 cases) were used for analyses. Histologically, polymorphous proliferation was found in 20 cases, and these were thus diagnosed as PR. A monomorphous pattern was found in the remaining last case. Immunohistochemical analysis revealed that the proliferating cells were CD56 (123C3)+ and/or CD16 (2H7)+, TIA-1+ and frequently stained CD3 epsilon+. Tumor cells were frequently stained positively with monoclonal antibodies (mAbs) for T lymphocytes, but were negative for T-cell receptor (TCR) beta and delta chain expression. In situ hybridization analysis using an Epstein-Barr virus-encoded early RNA 1 (EBER-1) probe revealed positive signals in 13 of the 15 cases examined. Southern blotting analysis for clonality of the Epstein-Barr virus (EBV) genome in 12 positive cases confirmed the presence of monoclonal proliferation in 7 cases. The pattern of TCR gamma chain gene rearrangement was examined by PCR analysis of DNA from tumor tissues by the denaturing gradient gel electrophoresis method. The results demonstrated no clonal rearrangement in any of the 21 cases examined, including 7 cases with proven clonal proliferation of EBV-infected cells, indicating the absence of T-cell clones. Our findings strongly suggested that nasal T-cell lymphoma is in fact a NK cell lymphoma.     

中线恶网中的EB病毒感染

目的　观察一组中线恶网病变组织中 EB病毒感染的存在情况及其异形淋巴样细胞( atypic al lymphoid cells,AL Cs)的免疫表型。方法　 37例病变组织切片作 DNA- RNA原位杂交 ,检测 EB病毒编码的小分子 RNA( EBER) ,作免疫组化染色看 EB病毒隐伏膜蛋白 ( L MP)抗原的表达及 ALCs的免疫表型 ;其中 15例用 PCR方法检测了 EBV- DNA。结果　 ( 1) 31/ 37例 ,占 83.8%之ALCs呈 EBER 1/ 2阳性反应 ;12 / 15例 ,占 80 %检出 EBV- DNA;5/ 19例 ,占 2 6.3%之少部分 AL Cs呈 L MP阳性反应。 ( 2 ) 2 0 / 37例 ,占 54.1%之 ALCs同时表达 CD3及 CD56抗原 ;5/ 19例 ,占 2 6.3%之少部分 ALCs呈 CD30 反应。结论　该组中线恶网病例中存在着较高比率的 EB病毒隐性感染 ,其ALCs既表达 T细胞分化抗原 ,同时也高水平地表达自然杀伤细胞抗原 ,CD56。作者还复习讨论了多种淋巴增生性疾病中 EBV感染的存在情况。     

儿童系统性EB病毒阳性T细胞淋巴组织增殖性疾病临床病理分析

目的 探讨儿童系统性EB病毒阳性T细胞淋巴组织增殖性疾病(CSEBV+T-LPD)的临床病理特征及免疫表型.方法 通过免疫组织化学、原位杂交、基因重排技术,分析11例CSEBV+T-LPD患者临床病理特征,并进行随访.结果 临床特征:男性5例,女性6例,中位年龄13岁(3~19岁),中位病程6个月(3~25个月).其中4例诊断为淋巴瘤,男女各2例,中位年龄15岁,中位病程4.5个月.11例患者主要症状有反复持续发热(10例)、多发淋巴结肿大(10例)、脾大(7例)、肝大(4例).组织病理学特征:4例淋巴瘤患者表现为淋巴细胞片状或弥漫性增生,细胞体积中等偏大,增生细胞较单一;7例良性病变者增生细胞较混杂,增生淋巴细胞散在其中,体积中等偏大或大.免疫表型:全部患者增生细胞大多数为T细胞,均强弱不等地表达CD3ε.2例淋巴瘤患者、1例良性病变者中CD8单阳性,4例淋巴瘤患者、1例良性病变者有T细胞抗原丢失.全部患者EBV-EBER阳性.T细胞受体(TCR)基因检测:3例淋巴瘤患者、1例良性病变者检测到克隆性重排.病理分级:淋巴瘤患者均为A3级,良性病变者1例为A2级、6例为A1级.结论 CSEBV+T-LPD是一系列涵盖不同发展阶段的疾病谱,诊断需结合临床特征、病理形态、免疫表型、EBV-EBER原位杂交及TCR基因检测等综合分析.患者年龄偏大,增生细胞较单一、 弥漫或片状,CD8单阳性,T细胞抗原丢失尤其CD5、EBV-EBER高表达,TCR克隆性重排,病理分级为A3级等因素对于鉴别良、恶性病变可能有重要提示意义.     

散发性Burkitt淋巴瘤的病理学特点

 目的　探讨散发性Burkitt 淋巴瘤（BL）的临床病理、免疫表型及分子生物学特征。方法　对20例散发性BL病例进行了光镜、免疫组化、EB病毒（EBV）原位杂交及间期荧光原位杂交（FISH）检测,结合临床特征进行综合分析。结果　20例散发性BL中,男性16例,女性4例;年龄3～14岁,中位年龄9岁。光镜下部分典型的BL肿瘤细胞弥漫一致性增生浸润,见较明显的吞噬核碎片的巨噬细胞形成的"星天现象"。部分病例形态学需鉴别其他肿瘤。免疫组织化学染色显示,瘤细胞表达CD20和CD10,不同程度地表达CD79a、bcl-6、MUM-1等,大于95 %的瘤细胞Ki-67阳性;EBV原位杂交显示EBER 1／2 阴性;间期FISH有c-myc基因异常。结论　散发性BL属高度侵袭性淋巴瘤,需要与多种其他肿瘤鉴别,明确诊断有助于临床针对性地进行高强度治疗。基于分子水平及蛋白水平多项标志物的检测,可大大减少漏诊和误诊,并为临床的准确诊断和及时治疗提供有力的依据。     

睾丸的原发性NK/T细胞淋巴瘤一例报告及文献复习

Objective： To study the clinical and pathological features of primary NK/T cell lymphoma of testis and to investigate the effective diagnosis and treatment of this disease. Methods： The surgical specimens of a patient with primary NK/T cell lymphoma of the testis were observed by light microscopy, immunohistochemistry and examined by the polymerase chain reaction （PCR） for Epstein-Barr virus （EBV） DNA and T-cell receptor （TCR） gene rearrangement, and the literature were reviewed. Results： The patient presented with left-sided painless testicular enlargement and the lymphoma had a propensity to spread to the contralateral testis, spleen, central nervous system, and so on. The neoplastic cells were positive for CD56, CD45R0 and CD3ε, while the expressions of CD20, CD79α, CD5, Bcl-2 and PLAP were negative. In addition, the EBV DNA was detected in the lymphoma by PCR. And the results of gene rearrangement studies for the y chain of the T-cell receptor were negative. The pathological diagnosis was NK/T cell lymphoma of the left testis. Conclusion： Primary NK/T cell lymphoma of the testis is a rare entity and progressed rapidly. The histopathological, immunohistochemical, EBV examination and TCR gene rearrangement studies should be carried out as soon as possible in order to get the defined diagnosis. Currently, the therapeutic efficacy is poor and the new measures should be investigated to improve the survival rate.     

Angio-immunoblastic T cell lymphoma (AILD-TL) rich in large B cells and associated with Epstein-Barr virus infection. A different subtype of AILD-TL?

We studied eight patients with characteristic features of angio-immunoblastic T cell lymphoma (AILD-TL) associated with more than 25% of large B cells. Polymerase chain reaction (PCR) analysis showed a clonal rearrangement of the T cell receptor (TCR)-gamma chain gene in all cases. One additional case showed a clonal rearrangement of the TCR-beta chain gene by Southern blot hybridization. PCR analysis showed a clonal immunoglobulin rearrangement in three cases presenting with more than 50% of large B cells whereas the other cases had a germline configuration. In 6/8 cases, double-labeling immunohistochemistry and in situ hybridization demonstrated that Epstein-Barr virus (EBV) was mostly present in the large B cells but also detected in some T cells. We further evaluated the frequency of AILD-TL with more than 25% of large B cells in the 106 cases collected by the French GELA group and found an incidence of 18%. The outcome of these patients did not differ significantly from those with less than 25% of B cells. With this approach we confirm the heterogeneity of AILD-TL features and the possible association with a substantial numbers of CD20(+), EBV(+) large B cells. We propose to denominate these cases as 'AILD-TL rich in large B cells' and to consider them as a different entity which can be misdiagnosed as a reactive process or as T cell rich B cell lymphoma.     

Sporadic Activation of Epstein-Barr Virus in Thyroid Lymphoma

The causal role of Epstein-Barr virus (EBV) in the development of B-cell lymphoma, especially in immunocompromised individuals, has been suggested. The purpose of the present study was to evaluate an association of EBV with thyroid lymphoma (TL) and chronic lymphocytic thyroiditis (CLTH) which is known to play an important role in the development of TL. Thirty cases with TL and 28 with CLTH were studied for presence or absence of EBV genome in the lesions using the polymerase chain reaction (PCR) and the in situ hybridization method. EBV genomes were detected by PCR in one and two cases with CLTH and TL. respectively. Subtyping of EBV genome was possible in one TL case showing B-type in EBNA-2 coding region. In situ hybridization revealed positive signals in the nucleus of lymphoma cells, which also expressed latent membrane protein-I. The present findings indicate that activation of EBV in TL is not common.     

Primary Testicular NK/T-Cell Lymphoma：A Study of Two Cases and Review of Literature

Primary testicular NK/T-cell lymphoma is an extremely rare entity progressed rapidly. The aim of this study was to examine clinical and pathological features of primary testicular NK/T-cell lymphoma and to investigate the effective diagnosis and prognosis. In this paper, the two cases of primary testicular NK/T-cell lymphoma were observed by light microscopy, immunohistochemistry and examined by in situ hybridization for Epstein-Barr Virus (EBV) DNA and the literatures were reviewed. The two patients respectively present with bilateral and right-side painless testicular enlargement. The morphology of neoplastic cells of case 1 were small to medium, tumor cells of case 2 were small, medium and large mixed. The tumor cells grew diffusely with irregular and distort nuclear, destructed the organizational structure of the normal testis, and damaged blood vessels, meanwhile, coagulation necrosis was exist. Immunohistochemical staining of neoplastic cells showed positive for CD45, CD2, CD56, CD3ɛ (cytoplasm staining pattern), CD45RO and Granzyme B, and negative for CD57, CD20, CD79α, CD30, CK, MPO, TdT, Bcl-2 and PLAP were negative. In addition, the EBV DNA was detected in the lymphoma by In situ hybridization. In conclusion, the expression of CD56, CD3ɛ, and Granzyme B associated proteins and EBV examination by in situ hybridization play a vital role in diagnosis and differential diagnosis of primary testicular NK/T-cell lymphoma.     

Pyothorax-associated T-cell lymphoma: a case report

We present a case of pyothorax-associated T-cell lymphoma in which Epstein-Barr virus (EBV) genome is not detected in the tumor cells. An 80-year-old male came to our hospital because of a left chest pain. Chest computed tomography (CT) showed a mass at the lower-dorsal part of the pyothorax wall, which involved the adjacent chest wall. The surgical biopsy specimen showed a predominant infiltration of atypical lymphocytes. Results of immunohistochemical analysis were as follows: CD3+, CD4-, CD8+, CD20-, CD30-, CD45RO+ and CD79a-. We diagnosed this case as a type of peripheral T-cell lymphoma. In situ hybridization using EBV-encoded RNA-1 (EBER-1) did not reveal the positive signals in the nucleus of tumor cells. Polymerase chain reaction (PCR) analysis yielded a negative result for human herpesvirus 8 (HHV8). Radiation therapy at 54 Gy reduced the tumor size by 90%. Visual and hearing disturbances of unknown etiology developed just before the completion of radiotherapy. The symptoms progressively worsened and the patient became bedridden. He died of pneumonia 2 months after the completion of radiotherapy. Autopsy did not reveal abnormalities to which the neurological disturbances were attributable.     

鼻NK/T细胞淋巴瘤的免疫表型、EBV感染及TCRγ基因重排的检测

 目的 检测鼻NK/T细胞淋巴瘤（NK/TCL）的免疫表型、EBV感染及TCRγ基因重排,为诊断和鉴别诊断提供依据。方法 收集诊断鼻NK/TCL48例患者石蜡包埋标本,用免疫组化SP法标记LCA、CD79α、CD20、CD56、CD3、CD45RO及EBV抗体研究其免疫表型;EBER探针原位杂交方法检测EBV编码的小分子RNA（EBER）;聚合酶链式反应扩增方法检测TCRγ基因重排。结果 48例鼻NK/TCL均表达LCA,CD3、CD45RO、CD56和EBV阳性率分别为44%、52%、73%和19%,CD79α和CD20均阴性;EBER阳性率为81%;TCRγ基因重排阳性率为19%。结论 鼻NK/TCL免疫表型不一致,并非所有病例CD56阳性,石蜡切片中CD3阳性定位于细胞质;EBER在肿瘤细胞中高表达,提示它们可能为NK细胞来源;部分TCRγ基因重排阳性病例应为鼻NK样T细胞淋巴瘤。     

Epstein-Barr virus in lymphoproliferative diseases in the sino-nasal region: Close association with CD56+ immunophenotype and polymorphic-reticulosis morphology

Association between Epstein-Barr virus (EBV) and nasal T-cell lymphoma (NTL) has been demonstrated. NTL has 2 types of histologic figures: one is ordinary non-Hodgkin's lymphoma (NHL) with monomorphous proliferation, and the other is polymorphic-reticulosis (PR) morphology. The presence of the EBV genome and its sub-types (A and B) were examined on paraffin-embedded specimens from 36 cases of sino-nasal lymphomas (SNL) collected from Seoul, Republic of Korea, where the frequency of NTL is high. Patients' ages ranged from 2 to 74 years (median 54 years) with a male-to-female ratio of 2.5:1. Immunophenotypically, 8 cases were B-cell type, 11 were T-cell type with CD56⁻, 14 were CD56⁺ type, and 3 were null-cell type. Five of 11 cases with ordinary NHL of T-cell type and 9 of 14 cases with PR were CD56⁺. The EBV genome was found by polymerase chain reaction (PCR) and in the tumor cells by in situ hybridization (ISH) in 1 of 4 B-cell type (25%), 5 of 10 T-cell type (50%), 11 of 13 CD56⁺ type (85%), and in both of null-cell type (100%). Of 16 cases with PR morphology, 15 (94%) were positive for the EBV genome. All of the 5 NTLs of ordinary NHL with CD56⁻ were negative for EBV. Concerning the sub-type of BV, 16 cases had type A, while none had type-B EBV. These findings suggest that NTL comprises 2 groups: EBV-positive NTLs are CD56⁺ and/or histologically PR, and EBV-negative NTLs are CD56⁻ and histologically ordinary NHL. The current results on Korean patients, together with earlier studies on Japanese and Malaysian patients, have shown the predominance of type-A EBV in sino-nasal lymphoma in Asia. © 1997 Wiley-Liss, Inc.     

单形性亲上皮性肠道T细胞淋巴瘤临床病理特征分析

目的:探讨单形性亲上皮性肠道T细胞淋巴瘤（MEITL）的组织病理学形态、免疫表型、分子病理特征、临床预后及治疗等。方法:回顾性分析四川金域医学检验中心有限公司2019年3月至2021年2月5例MEITL患者的临床病理资料,并复习相关文献。5例均进行组织病理、免疫组织化学、EB病毒原位杂交及T细胞克隆性评估检测,1例进行了二代测序（NGS）检测。临床随访2例。结果:5例MEITL均为中老年男性,组织病理学表现为肠壁弥漫肿瘤细胞浸润,细胞明显亲上皮性。所有患者肿瘤细胞CD3、CD8、CD56、GrB均阳性,其他T细胞标志表达情况不一,其中1例CD30阳性,1例CD20阳性。5例EB病毒原位杂交均阴性。5例均检测到T细胞受体基因单克隆性重排。1例NGS检测到BCOR、JAK3、STAT5B、ATM基因突变。2例获得随访的患者中,1例首次发病行手术后7个月复发,再次手术,13个月后因肺、肝、腹腔广泛转移并腹腔积液死亡;1例穿孔急诊手术后1个月死亡。结论:MEITL是一种罕见的消化道原发性T细胞淋巴瘤,发病机制主要涉及肿瘤抑制基因SETD2突变和JAK-STAT通路的1个或多个基因突变。MEITL目前无标准的治疗方法,主要采取手术切除和蒽环类药物为主的化疗。     

Detection of Epstein-Barr virus DNA in Reed-Sternberg cells of Hodgkin's disease using the polymerase chain reaction and in situ hybridization

Thirty-one cases of Hodgkin's disease were examined for the occurrence of Epstein-Barr virus (EBV) genome by using the polymerase chain reaction (PCR) of DNA in formalin-fixed paraffin-embedded tissues and in situ hybridization technique. The cases were subdivided into 17 cases of nodular sclerosis (NS), nine cases of mixed cellularity (MC), four cases of lymphocyte predominance (LP), and one case of lymphocyte depletion (LD). EBV DNA was detected in eight cases including four cases of NS, three cases of MC and one case of LP. The sensitivity of PCR was higher than that of Southern blot hybridization of DNA from fresh frozen tissue, because Southern blot hybridization using the BamHI-W fragment of EBV detected virus DNA only in two of three cases which were positive by PCR. The results of in situ hybridization studies confirmed that EBV genome was localized within the nuclei of Reed-Sternberg (RS) cells and their mononuclear variants. Furthermore, double-labeling studies combining in situ hybridization and immunocytochemistry using CD30 (BerH2) and CD15 (LeuM1) as markers of RS cells, as well as pan B-marker (L26) and pan T-marker, CD45RO (UCHL1), were performed to demonstrate the phenotype of EBV DNA-positive cells, confirming that EBV DNA was present in RS cells but not in lymphocytes. The results of this study indicate a significant association between EBV and some cases of Hodgkin's disease.     

Detection of Epstein-Barr Virus DNA in Reed-Sternberg Cells of Hodgkin's Disease Using the Polymerase Chain Reaction and in situ Hybridization

Thirty-one cases of Hodgkin's disease were examined for the occurrence of Epstein-Barr virus (EBV) genome by using the polymerase chain reaction (PCR) of DNA in formalin-fixed paraffin-embedded tissues and the in situ hybridization technique. The cases were subdivided into 17 cases of nodular sclerosis (NS), nine cases of mixed cellularity (MC), four cases of lymphocyte predominance (LP), and one case of lymphocyte depletion (LD). EBV DNA was detected in eight cases including four cases of NS, three cases of MC and one case of LP. The sensitivity of PCR was higher than that of Southern blot hybridization of DNA from fresh frozen tissue, because Southern blot hybridization using the Bam HI-W fragment of EBV detected virus DNA only in two of three cases which were positive by PCR. The results of in situ hybridization studies confirmed that EBV genome was localized within the nuclei of Reed-Sternberg (RS) cells and their mononuclear variants. Furthermore, double-labeling studies combining in situ hybridization and immunocytochemistry using CD30 (BerH2) and CD15 (LeuM1) as markers of RS cells, as well as pan B-marker (L26) and pan T-marker, CD45RO (UCHL1), were performed to demonstrate the phenotype of EBV DNA-positive cells, confirming that EBV DNA was present in RS cells but not in lymphocytes. The results of this study indicate a significant association between EBV and some cases of Hodgkin's disease.     

鼻腔鼻窦非霍奇金淋巴瘤免疫表型及其与EB病毒感染的关系

背景与目的:鼻腔鼻窦非霍奇金淋巴瘤(non-Hodgkin's lymphoma,NHL)的患病率和免疫表型组成具有地域性差异.本研究探讨中国广州地区57例鼻腔鼻窦NHL免疫表型及其与EB病毒(Epstein-Barr virus,EBV)感染的关系.方法:收集2000年4月1日至2006年10月31日中山大学肿瘤防治中心病理科57例鼻腔鼻窦NHL标本.免疫组化染色确定免疫表型,EBER原位杂交及PCR检测EBV感染情况.结果:在同期诊断的1 412例NHL中,71例(5.03%)发生于鼻腔鼻窦,其中仅有57例适用于本研究.57例鼻腔鼻窦NHL患者中,男性38例,女性19例,年龄3～75岁,中位年龄50岁;44例(77.19%)为鼻型NK/T细胞淋巴瘤,其中37例(84.09%)为EBV /CD56 NK细胞肿瘤,7例(15.91%)为EBV /CD56-细胞毒性T细胞表型;11例(19.30%)为B细胞淋巴瘤,其中6例为弥漫大B表型,2例为Burkitt(Burkitt样)淋巴瘤(EBV ),1例为髓外浆细胞瘤(EBV ),1例为MALT淋巴瘤(EBV-),1例为小淋巴细胞性淋巴瘤(EBV-);2例(3.51%)为外周T细胞淋巴瘤(EBV-).37例适用DNA检测的病例中,25例(67.57%)感染缺失型LMP1(del-LMP1)EBV株,12例(32.43%)感染野生型LMP1(wt-LMP1)EBV株.结论:鼻腔鼻窦NHL最常见的类型为鼻型NK/T细胞淋巴瘤,可进一步分为EBV /CD56 NK细胞及EBV /CD56-细胞毒性T细胞表型.NK/T细胞淋巴瘤均感染了EBV,EBV株主要为del-LMP1型.     

Composite lymphoma: angiocentric T-cell lymphoma (CD8+ cytotoxic/suppressor T-cell) and diffuse large B-cell lymphoma associated with EBV, and presenting clinically as a midfacial necrotizing lesion

A composite lymphoma is defined as the simultaneous occurrence of two histologically different types of lymphomas situated in one anatomical location. Reports of composite B- and T-cell lymphomas, especially in the head and neck region, are rare. We describe a 76-year-old Taiwanese aboriginal female patient clinically presenting with a midfacial necrotizing lesion (MNL). Microscopic examination of the incisional biopsy specimen revealed extensive surface necrosis with infiltrates of inflammatory cells. Beneath the necrotic surface, there appeared to be two distinct populations of pleomorphic lymphoid cells exhibiting the characteristic features of the angiocentric distribution of the tumor cells and evidence of angiodestruction. Immunohistochemical staining revealed that these atypical lymphoid cells were positive for LCA, CD45, CD5, CD20, CD3 epsilon, CD8, bcl-2 and bcl-6 and negative for CD56, CD4, CD68, keratin, S-100, kappa and lambda. Furthermore, these atypical lymphoid cells also expressed EBV-encoded nuclear RNAs (EBERs) following in situ hybridization. Therefore, this was a case of composite lymphoma: angiocentric T-cell lymphoma (ATCL) (CD8+ cytotoxic/suppressor T-cell) and diffuse large B-cell lymphoma (DLBL) associated with the Epstein-Barr virus (EBV) and presenting clinically as MNL.     

EB病毒相关的人类免疫缺陷病毒阴性浆母细胞淋巴瘤的临床病理分析

目的 探讨人类免疫缺陷病毒（HIV）阴性且无免疫缺陷的浆母细胞淋巴瘤（PBL）的临床病理特征,提高对这组疾患的认识.方法 回顾性分析6例无免疫缺陷且HIV-PBL的组织学特点,原位杂交染色检测EB病毒（EBV）感染状态.分别采用免疫组织化学SP法及荧光原位杂交（FISH）技术检测PBL的免疫表型、EBV潜伏类型,探索myc基因的易位.结果 HIV-PBL表现为浆母细胞样或免疫母细胞样细胞的单一增生,可见瘤巨细胞及坏死;背景反应细胞少,核分裂象较多.所有病例都有EBV感染,潜伏类型为Ⅰ型（LMP1^-及EBNA2^-）.肿瘤细胞表达B细胞终末分化阶段的表型CD20^-/CD3^-/CD1386＋/Kappa＋或Lambda^＋.6例HIV-PBL均为老年患者（中位年龄69.5岁）,男女各3例;结外及口腔外侵犯率高,分别为6、5例.中位生存期为25.5个月.此外,3例患者具有免疫球蛋白重链（IgH）与myc基因易位.结论 HIV-PBL是一组独立疾患,具有无HIV感染、老年人、EBV阳性、结外及口腔外侵犯率高等特点,应与HIV＋的PBL相区别.     

Plasmablastic lymphoma: an HIV-associated entity with primary oral manifestations.

Plasmablastic lymphoma is a relatively new entity that is considered to be a diffuse large B-cell lymphoma with an unique immunophenotype and a predilection for the oral cavity. We present a 50 year-old HIV-positive, bisexual, white male with a CD4 count 300/mm(3) and a viral HIV-RNA polymerase chain reaction (PCR) load of 237 copies/ml, who developed a painful, purple-red mass in the edentulous area of the maxillary right first molar. Erythematous gingival enlargements of the interdental papillae were seen in three of the dental quadrants. In addition, the patient was being managed with antiretroviral therapy and liposomal doxorubicin for recurrent cutaneous Kaposi's sarcoma (KS). Although oral KS was suspected, the gingival lesions were biopsied because they were refractory to chemotherapy and a lymphoma could not be excluded. Histopathologic examination revealed a lymphoid malignant neoplasm, consistent with a plasmablastic lymphoma. Immunoreactivity with vs38c, CD79a, kappa light chain, and IgG was readily identified in tumor cells; while only focal cells expressed CD20 and LCA (CD45RB). CD56, CD3, lambda light chain, and EMA were non-reactive. EBV was detected in the tumor by Southern hybridization, PCR amplification, in situ hybridization for EBER-1 DNA, and immunohistochemistry for latent membrane protein-1. The same tumor was negative for HHV-8 by PCR. Recognition of plasmablastic lymphoma is important, because it represents an HIV-associated malignancy that predominantly involves the oral cavity, may mimic KS and has a poor prognosis.