儿童散发性伯基特淋巴瘤的分子遗传学特征分析

目的 研究儿童散发性伯基特淋巴瘤(BL)的分子遗传学特征及其诊断和鉴别诊断.方法 对64例儿童BL和6例儿童弥漫性大B细胞淋巴瘤(DLBCL)进行免疫组织化学染色(SP法)和荧光原位杂交(FISH)技术检测c-myc、bcl-2、bcl-6、IgH、myc/lgH及bcl-2/IgH基因重排的情况.根据细胞起源分类分为生发中心组(GC组)、生发中心晚期组(late-GC组)、生发中心后组(post-GC组).结果 BL表达CD20(64例)、CD10(63例)、bcl-6(62例)、MUM1(15例)、bcl-2(0例).GC组49例(76.6%)、late-GC组14例(21.9%)、post-GC组1例(1.6%).c-myc基因断裂54例(93.1%);IgH基因断裂48例(82.8%);c-myc与IgH基因同时断裂并myc/IgH基因易位46例(85.2%);c-myc基因断裂、IgH和myc/IgH基因正常4例(7.4%);c-myc、IgH和myc/IgH基因均正常4例(7.4%);bcl-2基因正常61例(100%);bcl-6基因正常59例,1例断裂并扩增具有BL的病理形态和免疫表型特征,同时具有c-myc基因断裂,将病理诊断修改为介于DLBCL和BL之间的未分类的B细胞淋巴瘤(DLBCL/BL).6例DLBCL中c-myc基因断裂2例;2例bcl-6基因扩增,其中1例伴c-myc基因断裂;无bcl-2/IgH基因重排.结论 儿童散发性BL大多数来源于生发中心B细胞,c-myc基因的断裂是其主要分子遗传学改变.应用FISH进行多基因的检测,有助于提高儿童BL的诊断和鉴别诊断水平.     

MUM1蛋白在弥漫性大B细胞淋巴瘤中的表达及意义

目的 探讨弥漫大B细胞淋巴瘤(diffuse large B-cell lymphoma,DLBCL)中活化的B细胞相关蛋白MUM1的表达与临床病理特征之间的关系.方法 利用组织微阵列免疫组化检测60例DLBCL石蜡包埋组织中MUM1、bcl-6和CD10的表达.结果 60例DLBCL被分为两种抗原表达表型:一种为活化的B细胞表型(A型)表达MUM1;另一种为生发中心B细胞表型(B型),表达CD10和(或)bcl-6但不表达MUM1.60例DLBCL中61.67%为A型,31.67%为B型,其中59.25%中心母细胞型,3/4免疫母细胞型,2/2间变性大B细胞型均为A型.A型在结外和结内DLBCL中分别占61.76%和61.54%,而在胃肠道DLBCL中的比例(47%)显著低于在其他结外DLBCL中的比例(80%,P=0.079).在MUM-1( )/bcl-6( )/CD10( /-)的病例中,75.00%(12/16)为结外DLBCL,高于在MUM-1( )/bcl-6(-)/CD10(-)病例中的比例43.75%(7/16),但差异没有显著性(P=0.149).结论 A型(表达MUM1)在DLBCL中的比例较高,提示MUM1表达很可能与DLBCL组织学变异有关,联合检测CD10和bcl-6,可协助DLBCL分型诊断.     

c-myc基因在弥漫性大B细胞淋巴瘤中的意义及其应用

弥漫性大B细胞淋巴瘤(diffuse large B-cell lymphoma,DLBCL)是临床最常见的非霍奇金淋巴瘤,占西方国家成人非霍奇金淋巴瘤的30％ ～ 40％[1],在发展中国家所占比例更高.DLBCL在形态学、免疫表型、生物学特征及临床表现等方面均具有显著的异质性.已有的研究表明[2-4],与DLBCL预后相关的因素主要包括:免疫表型、bcl-2及bcl-6蛋白表达情况、bcl-6基因重排、国际预后指数(IPI)、有无累及骨髓等.依据不同的细胞来源,DLBCL分为生发中心B细胞(germinal center B-cell,GCB)及非生发中心/活化B细胞(non-germinal center B-cell/active B-cell,non-GCB/ABC)两个亚型[5-6],目前临床主要通过免疫组织化学染色方法检测肿瘤细胞CD10、bcl-6、MUM1、GCET1及FOXP1的表达情况进行分型.临床资料显示,在给予常规CHOP(环磷酰胺、多柔比星、长春新碱、泼尼松)方案化疗后,GCB亚型对药物的反应性及预后明显优于ABC亚型,因此免疫分型被认为是一种独立的预后评估指标,多年来一直被应用于临床,对患者进行低危和高危人群的分层.     

弥漫性大B细胞淋巴瘤3q27染色体状态和不同亚型与预后的关系

目的 从蛋白和基因水平研究弥漫性大B细胞淋巴瘤(DLBCL)的3q27染色体状态和不同亚型与预后的关系.方法 应用免疫组织化学EnVision法对有随访资料的73例DLBCL进行CD3、CD10、CD20、bcl-6、MUM-1标记,根据Hans的分类方法分为生发中心B细胞型(GCB型)和非生发中心B细胞型(non-GCB型),其中54例应用荧光原位杂交(FISH)技术检测bcl-6基因所在的3q27染色体的断裂和扩增情况.结果 73例DLBCL患者GCB型16例(21.9%),non-GCB型57例(78.1%).54例DLBCL患者中3q27染色体断裂11例(20.4%),扩增14例(25.9%).5年总体生存率GCB型(78%)高于non-GCB型(40%),差异有统计学意义(P=0.011).bcl-6阳性表达较阴性者预后好(P=0.041);3q27断裂阳性组病例总体生存率低于3q27断裂阴性组.结论 DLBCL的GCB型比non-GCB型预后好.bcl-6蛋白表达有助于DLBCL的预后判断,3q27染色体断裂阳性病例总体生存率低于3q27断裂阴性组.目前仍有必要区分DLBCL的B细胞的起源.     

凋亡抑制基因bcl-2在弥漫性大B细胞淋巴瘤中的表达及其临床意义

目的 探讨凋亡抑制基因bcl-2在弥漫性大B细胞淋巴瘤(DLBCL)不同免疫亚型中的表达,以及bcl-2蛋白表达对患者生存期的影响.方法 应用免疫组织化学(EliVision plus和PV-9002法)对214例DLBCL进行CD10、bcl-6、MUM-1、bcl-2及NF-κB检测,采用Hans免疫分型方法将DL...     

T细胞淋巴瘤1和CD44蛋白在Burkitt淋巴瘤中的表达及其诊断价值

目的 探讨T细胞淋巴瘤1(TCL1)和CD44蛋白在Burkitt淋巴瘤中的表达及其诊断价值.方法 在石蜡包埋的实验组25例Burkitt淋巴瘤和对照组25例非特指弥漫性大B细胞淋巴瘤(DLBCL)中采用免疫组织化学EnVision法检测CD44、TCLl以及CD10、bel-2、bcl-6、c-myc、Ki-67等常用抗体表达情况.结果 Burkitt淋巴瘤中瘤细胞96%(24例)呈TCL1阳性,仅4%(1例)CD44阳性;88%(22例)CD10阳性、92%(23例)bcl-6和c-myc阳性,仅4%(1例)bcl-2阳性;Ki-67增殖指数为95%～100%.非特指DLBCL中仅16%(4例)TCL1弱阳性,84%(21例)CD44阳性、32%(8例)CD10阳性、72%(18例)bcl-6和bcl-2阳性、c-myc均阴性,Ki-67增殖指数40%～90%.结论 当形态和免疫表型不典型时,TCL1和CD44两种蛋白的检测有助于提高Burkitt淋巴瘤的确诊率及其与DLBCL的鉴别诊断.     

儿童与成人弥漫大B细胞淋巴瘤的Hans、Choi免疫分型和C-MYC基因特征

目的 探讨弥漫大B细胞淋巴瘤(DLBCL)各年龄组的Hans、Choi免疫分型及C-MYC基因特征.方法 收集60例DLBCL临床病理资料并进行随访,其中儿童组17例、成人组43例.用免疫组化SP法观察CD10、BCL-6、MUM1、FOXP1、GCET1及CD5蛋白表达,根据Hans及Choi免疫分型标准分型;用间期荧光原位杂交法检测C-MYC 基因.结果 1)Hans分型:儿童DLBCL组GCB型11例,non-GCB型6例;成人组DLBCL中GCB型9例,non-GCB型34例(P＜0.05).2) Choi分型:儿童DLBCL组GCB型13例,ABC型4例;成人DLBCL组GCB型13例,ABC型30例(P＜0.01).3) C-MYC基因:儿童组DLBCL中C-MYC基因断裂6例;成人组DLBCL中C-MYC基因正常43例(P＜0.01).结论 儿童DLBCL以GCB型为主,预后较好;成人DLBCL以non-GCB或ABC型为主,预后相对较差,儿童DLBCL的C-MYC基因断裂明显高于成人.     

原发性骨非霍奇金淋巴瘤临床病理预后和病因学分析

目的探讨原发性骨非霍奇金淋巴瘤（PNHLB）的临床病理特征、预后指标及病因学。方法复习17例PNHLB患者的临床资料,同时进行免疫组织化学EnVision法检测免疫标志物、原位杂交检测EBER及PCR检测bcl-2／JH基因重排,并对血清LDH、治疗、国际预后指数（IPI）、免疫标志物与预后的关系进行分析。结果17例PNHLB以弥漫性大B细胞淋巴瘤为主（94．1％）,患者的5年生存率为68．8％,IPI高危类、bcl-2过表达对预后不利（2者的P值分别为0．031和0．028）,治疗方式和CD10、MUM-1、bcl-6的表达对预后的判断差异无统计学意义（P〉0．05）。8例人类B-珠蛋白基因扩增阳性的骨DLBCL患者中1例Bcl-2／JH基因重排扩增阳性。EBER原位杂交仅1例阳性。结论PNHLB预后较好,IPI及免疫组织化学检测bcl-2过表达是判断预后的指标。EB病毒与病因无相关性。     

弥漫大B细胞淋巴瘤中CyclinD2的表达及其临床意义

目的探讨弥漫大B细胞淋巴瘤(diffuse large B cell lymphoma,DLBCL)中Cyclin D2的表达及其与临床病理分型及预后的关系。方法收集79例确诊为DLBCL,每例分成两组:(1)石蜡标本制成组织芯片,应用光镜观察、免疫组化En Vision两步法检测CD3、CD20、CD10、BCL-6、MUM1、Ki-67、Cyclin D2蛋白,根据Hans分型法分型。(2)新鲜冷冻标本应用实时定量PCR(real-time quantitative PCR,qRT-PCR)法观察Cyclin D2 mRNA在不同亚型DLBCL中的相对表达量。应用Kaplan-Meier法分析Cyclin D2 mRNA相对表达量及各临床病理特征与生存期的关系。结果 79例DLBCL中,生发中心B细胞样(germinal center B-cell-like,GCB)型26例(32.9%),非生发中心B细胞样(non-germinal center B-cell-like,non-GCB)型53例(67.1%)。13例(16.5%)表达Cyclin D2蛋白,其中2例为GCB型(15.4%),11例为non-GCB型(84.6%),差异有统计学意义(P0.05)。Cyclin D2 mRNA的相对表达量在non-GCB型组显著高于GCB型组,差异有统计学意义(P0.05)。生存分析显示高临床分期及Cyclin D2 mRNA高表达组预后差。结论检测Cyclin D2蛋白及基因表达有助于提高DLBCL临床病理分型的准确性,并可能成为提示预后的重要指标。     

混合性经典型霍奇金淋巴瘤合并T细胞淋巴瘤一例

混合性淋巴瘤是指两种不同类型的淋巴瘤同时发生。该例患者男性,44岁,因无意中发现左颈部肿物入院,彩超提示左颈部4 cm大小肿物。镜下见弥漫小淋巴细胞间散在核大异型细胞。免疫组织化学显示散在核大细胞CD15、CD30、MUM1、PAX5等标记阳性,EB病毒编码的小RNA(EBER)显色原位杂交(CISH)检测显示核大细胞阳性,符合经典型霍奇金淋巴瘤。免疫组织化学显示背景小淋巴细胞CD3、CD2、CD7等标志物阳性,EBER CISH检测显示部分细胞阳性,T细胞受体基因检测提示2个位点单克隆重排,符合T细胞淋巴瘤。混合性淋巴瘤治疗不同于普通的淋巴瘤,需要综合制定化疗方案。     

弥漫性大B细胞淋巴瘤基因表达谱的初步研究

目的探讨弥漫性大B细胞淋巴瘤（DLBCL）不同免疫表型组的基因表达谱状况。方法根据CD10、bcl-6和MUM1的表达状况对156例DLBCL进行分组：CD10^＋和（或）bcl-6^＋、MUM1-（第1组）;CD10^＋和（或）bcl-6^＋、MUM1^＋（第2组）;CD10^-和bcl-6^-、MUM1^＋（第3组）。从各组中各选择3例共（9例）临床分期为Ⅳ期的病例标本,另取3例正常扁桃体组织作为对照,采用Affymetrix U133 plus2．0寡核苷酸芯片研究12例样本的基因表达谱。结果通过unsupervised等级聚类分析,12例样本被分成了4组,分别命名为A、B、C、D组。经与免疫表型分组结果对照显示两种分组结果完全一致：A、B、C组分别对应第1、2、3组,D组对应正常对照组。在DLBCL病例组中（A、B、C组）有81个基因显著表达下调,有86个基因显著表达上调。而其中的一个组（B组）虽然具有混合性生发中心B细胞样（GCB,A组）和活化的外周血B细胞样（ABC,C组）DLBCL的免疫表型,但在聚类分析中发现其基因表达谱与A组和C组均不同,有45个基因表达上调,并且有27个特异性表达基因。结论初步结果显示,DLBCL全基因组表达谱在分子水平上有不同的亚群,且可能通过免疫表型来区分。还提示基因表达谱B组DLBCL可能存在除细胞起源以外的不同异质性因素,而这种因素可能与DLBCL的发病机制相关。     

Histopathology and immunohistochemistry in distinguishing Burkitt lymphoma from diffuse large B-cell lymphoma with very high proliferation index and with or without a starry-sky pattern: a comparative study with EBER and FISH

Burkitt lymphoma (BL) is characterized by c-myc translocation and CD10+/bc-2-/bcl-6+ with a very high Ki-67 proliferation index (PI). Occasional diffuse large B-cell lymphomas may exhibit a very high PI with or without a starry-sky pattern (DLBCL-HPSS). We compared 28 consecutive BL and 16 DLBCL-HPSS cases in immunocompetent Taiwanese diagnosed by histopathologic examination and immunophenotyping and compared the results with results for Epstein-Barr virus-encoded messenger RNA (EBER) and fluorescence in situ hybridization (FISH). There were statistically significant differences in the expression of CD10 (28/28 vs 1/16), bcl-2 (3/28 vs 11/16), MUM1 (5/28 vs 15/16), a PI of 95.0% or more (27/28 vs 2/16), and combined CD10+/bcl-2-/bcl-6+ (24/28 vs 1/16) between BLs and DLBCL-HPSSs. Of the BLs, 7 (25%) of 28 and 26 (96%) of 27 were positive for EBER and c-myc rearrangement as compared with 0 of 16 and 1 (7%) of 15 DLBCL-HPSSs, respectively. We can confidently distinguish BL from DLBCL-HPSS by using histopathologic and immunohistochemical (CD10, bcl-2, bcl-6, Ki-67) methods without the aid of EBER and FISH in the great majority of cases.     

Comparative immunohistochemical analysis of pediatric Burkitt lymphoma and diffuse large B-cell lymphoma

Burkitt lymphoma (BL) and diffuse large B-cell lymphoma (DLBCL) account for nearly all pediatric nonlymphoblastic B-cell lymphomas. Because clinical behavior, prognosis, and response to therapy might differ, diagnostic accuracy is important. Morphologic examination often is sufficient, but occasionally, diagnostic ancillary studies are required. In adults, immunophenotyping is useful; however, pediatric data are limited. We characterized the immunohistochemical expression of 6 proteins (c-myc, CD10, bcl-6, bcl-2, CD138, and MIB-1) in pediatric BL (33 cases) and DLBCL (20 cases) with classic morphologic features. Significant differences in c-myc (BL, 30/33 [91%] vs DLBCL, 5/20 [25%]; P < .0001), bcl-2 (BL, 1/25 [4%] vs DLBCL, 7/19 [37%]; P < .02), and mean MIB-1 (BL, 99% vs DLBCL, 56%; P < .0001) expression were observed. There were no significant differences for CD10 (100% expression in BL and DLBCL), bcl-6 (BL, 23/33 [70%] vs DLBCL, 15/20 [75%]), or CD138 (no expression). Thus, pediatric BL and DLBCL have distinctive immunohistochemical profiles, and staining for c-myc, MIB-1, and bcl-2 might be useful in morphologically difficult cases.     

Germinal center and activated b-cell profiles separate Burkitt lymphoma and diffuse large B-cell lymphoma in AIDS and non-AIDS cases

Morphologic features of Burkitt lymphoma (BL) and diffuse large B-cell lymphoma (DLBCL) overlap. No single phenotypic marker or molecular abnormality is pathognomonic. We tested a panel of 8 germinal center (GC) and activated B-cell (ABC) markers for their ability to separate BL and DLBCL. We diagnosed 16 BL and 39 DLBCL cases from 21 patients with AIDS and 34 without AIDS based on traditional morphologic criteria, Ki-67 proliferative index, and c-myc rearrangement (fluorescence in situ hybridization). After immunohistochemically staining tissue microarrays of BL and DLBCL for markers of GC (bcl-6, CD10, cyclin H) and ABC (MUM1, CD138, PAK1, CD44, bcl-2), we scored each case for the percentage of positive cells. Hierarchical clustering yielded 2 major clusters significantly associated with morphologic diagnosis (P < .001). For comparison, we plotted the sum of the GC scores and ABC scores for each case as x and y data points. This revealed a high-GC/low-ABC group and a low-GC/high-ABC group that were associated significantly with morphologic diagnosis (P < .001). Protein expression of multiple GC and ABC markers can separate BL and DLBCL.     

Primary testicular diffuse large B-cell lymphoma shows an activated B-cell-like phenotype

The most common type of primary testicular lymphoma is diffuse large B-cell type, which has a poor prognosis relative to other extra-nodal diffuse large B-cell lymphomas (DLBCL). These constitute a heterogeneous group of lymphomas with germinal center B-cell-like and activated B-cell-like subtypes. Such a distinction theoretically utilizes the immunohistochemical expression of CD10, Bcl-6, and MUM1. The purpose of this study was that we could stratify primary testicular lymphoma of diffuse large B-cell type according to this scheme, and further elucidate the reason why primary testicular diffuse large B-cell lymphoma possesses a poor clinical outcome. Seventeen Chinese patients with primary testicular DLBCL were examined by means of a 3-antibody panel (CD10, Bcl-6, MUM1). Among these 17 cases, 16 were assigned to the activated B-cell-like subtypes. One case was classified as germinal center B-cell-like type. Twelve of these 17 cases expressed high proliferative activity (≥40% Ki-67 labeling). The majority of primary testicular DLBCLs have activated B-cell-like subtype characteristics and high proliferative activity. These features might be a significant factor; moreover, they are associated with poor prognosis.     

Expression of transmembrane adaptor protein PAG/Cbp in diffuse large B-cell lymphoma: immunohistochemical study of 73 cases

PAG/Cbp is a transmembrane adaptor protein involved in proximal immune signaling. It is expressed in reactive germinal centers (GC) of secondary lymphatic follicles and related malignant lymphomas. We studied PAG/Cbp expression in GC-like and non-GC-like diffuse large B-cell lymphoma (DLBCL) subtypes. Seventy-three cases of DLBCL identified among 155 malignant lymphomas were classified as GC-like DLBCL (CD10+ or CD10-, bcl-6+, and MUM1-) and non-GC-like DLBCL (CD10-, MUM1+ or CD10-, bcl-6+, MUM1+). PAG/Cbp was detected by monoclonal antibody MEM-255 following routine immunohistochemical procedures. Thirty-five of 40 GC-like DLBCLs (88%) and 20 of 33 non-GC-like DLBCL cases (61%) expressed PAG/Cbp. Four of 12 bcl-6-negative non-GC-like DLBCL cases (33%) were PAG/Cbp positive, and only 4 of 20 bcl-6-positive non-GC-like DLBCL cases (25%) were PAG/CBP negative. All 37 FL and all 5 Burkitt's lymphomas (BL) expressed PAG/Cbp, whereas all 6 mantle cell lymphomas (MCL) and 4 of 5 chronic lymphocytic leukemias (CLL/SLL) were PAG/Cbp negative. PAG/Cbp is a reliable GC marker. Its expression correlates with GC-like DLBC phenotype in a significant majority of cases. It is typically absent in MCL and SLL/CLL.     

Expression of survivin and of antigen detected by a novel monoclonal antibody, T332, is associated with outcome of diffuse large B-cell lymphoma and its subtypes

Although diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma, it is both clinically and morphologically heterogenous. The present study investigates the significance of survivin and a novel monoclonal antibody (MAb), T332, immunohistochemically for predicting the prognoses of DLBCL and its subtypes classified as germinal center B-cell-like type (GCB) and non-GCB type (NGCB) based on the expression profiles of CD10, bcl-6, and MUM1. A total of 60 cases of DLBCL (GCB, n = 22; NGCB, n = 38) were examined for the expression of survivin and T332 antigen. Survivin(+) DLBCL had a significantly worse prognosis (P = 0.01) than survivin(-) cases, as already reported, while survivin(+) GCB or NGCB tended to have poor prognoses (P = 0.06 and 0.07, respectively). However, T332(+) DLBCL and NGCB had significantly more unfavorable prognoses than T332(-) cases (P = 0.01 and 0.02, respectively) while there was no significant survival difference between the T332(+) and T332(-) groups of GCB (P = 0.11). Interestingly DLBCL coexpressing survivin and T332 (n = 13) had a significantly worse prognosis (P = 0.009) than the remaining single positive and double negative cases (n = 31). In conclusion, survivin and the novel MAb, T332, might be a good predictor of DLBCL and its subtypes.     

上海地区弥漫性大B细胞淋巴瘤的生发中心B细胞样型显著偏低

目的 探讨中国上海地区弥漫性大B细胞淋巴瘤(DLBCL)的生发中心B细胞(GCB)样型与非GCB样型的分布以及可能影响因素.方法 应用免疫组织化学EnVision法分析124例来自该院的原发DLBCL中CD10、bcl-6、MUMl、GCET1和FOXP15种蛋白的表达,采用Hans和Choi两种免疫表型分型法进行分型.其中118例应用荧光原位杂交技术检测t(14;18)和bcl-6基因重排情况.结果 使用Hans法对124例DLBCL进行分型,27例(22%)为GCB样型,97例(78%)为非GCB样型.使用Choi法进行分型显示34例(27%)为GCB样型,90例(73%)为非GCB样型(即ABe样型).GCB样型显著低于非GCB样型(P=0.0001).t(14;18)易位仅4例(3%),3例发生于GCB样型中.bcl-6基因重排阳性的病例为46例(39%),高发于GCB样型中.bcl-6基因重排与bcl-6蛋白表达没有明显相关性.结论 中国上海地区DLBCL的GCB样型显著低于非GCB样型,可能与其DLBCL的t(14;18)低水平发生有关.     

弥漫性大B细胞淋巴瘤t(14;18)易位及bcl-2基因扩增的检测

目的探讨弥漫性大B细胞淋巴瘤（DLBCL）t（14;18）染色体异位及bcl-2基因扩增在其分类及临床分期、疗效评估中的作用。方法先对60例DLBCL的标本进行显微切割,获取相对比较纯的肿瘤组织,再使用细胞核芯片荧光原位杂交（FISH）对标本进行t（14;18）易位及bcl-2基因扩增检测,采用免疫组织化学SP法在组织微阵列上同步观测CD20、CD10、bcl-6、MUM1的表达,进行生发中心样（GCB）和非生发中心样（non-GCB）分类;通过病例分析得出治疗效果及临床分期的信息,并统计分析以上各因素之间的关系。结果在60例DLBCL中,10例bcl-2／IgH阳性,18例bcl-2基因扩增;GCB29例（48．3％）,non-GCB31例（51．7％）。经FISH检测t（14;18）阳性10例中,GCB8例,non-GCB2例,差异有统计学意义（P=0．031）。t（14;18）阳性及bcl-2基因扩增的病例bcl-2表达均增高。在36例正规CHOP治疗的病例中,bcl-2扩增13例,无扩增23例,bcl-2扩增的13例之治疗结果显效、部分有效、无效率分别为3例（23．1％）、4例（30．8％）和6例（46．2％）;临床分期情况为Ⅰ-Ⅱ期1例（7．7％）,Ⅲ-Ⅳ期12例（92．3％）,这两项指标与bcl-2不扩增的相比差异均有统计学意义（P=0．019、0．046）。结论t（14;18）易位及bcl-2基因扩增均是引起DLBCL之bcl-2蛋白表达的原因,bd-2阳性者与预后有关的原因难以确定,可能是由于引起其阳性表达的原因不同所致;bcl-2基因扩增与治疗效果较差及临床分期较晚有关;FISH检测t（14;18）染色体易位可用于DLBCL的分类。