弥漫性大B细胞淋巴瘤C-MYC基因异常分析

  目的   探讨弥漫性大B细胞淋巴瘤(DLBCL) MYC基因异常情况及其与BCL-2、BCL-6基因异常的关系。   方法   应用组织芯片和FISH技术对194例DLBCL的MYC、BCL-2、BCL-6基因异常情况进行检测, 并用免疫组织化学法检测CD10、BCL-6、MUM-1及Ki-67等蛋白标记物, 分析其相互关系。   结果   在164例MYC基因异常为38例(23.17%), 其中基因易位9例(5.49%), 基因扩增29例(17.68%); 同时存在MYC和BCL-6基因易位有2例, 未发现MYC和BCL-2同时易位或三者同时易位的病例; 资料完整(同时获得三种基因FISH结果) 的159例病例中, MYC基因扩增28例(17.61%) 与BCL-2基因扩增38例(23.90%) 呈显著正相关(r=0.291 6, P=0.000 4);MYC基因易位病例Ki-67高表达率(5/8, 62.50%) 明显高于非MYC基因易位病例(33/149, 22.15%, P=0.027 7), 2例MYC和BCL-6同时易位的病例均为Ki-67高表达, MYC基因扩增与Ki-67高表达无显著相关性。   结论   有关MYC基因在弥漫性大B细胞淋巴瘤中的异常改变除基因重排外, 还有基因扩增等活化方式, 目前对其作用机制尚缺乏了解, 值得进行深入研究。      

BCL-6 P-gp在初诊弥漫大B细胞淋巴瘤中的表达及与IPI指数的相关性研究

  目的  通过免疫组化方法检测初诊弥漫大B细胞淋巴瘤（DLBCL）患者活检淋巴组织BCL-6、P-gp的表达,探讨初诊DLBCL患者上述指标表达的临床意义以及与IPI指数间的相关性。  方法  收集福建省立医院病理科存档的2006年10月~2010年10月,首次确诊DLBCL且接受化疗（CHOP或R-CHOP方案）≥2个疗程患者标本34例（其中27例完成6个疗程化疗）,检测BCL-6、P-gp的表达。入选病例根据国际预后指数（IPI）进行评分,将评分结果分别与所检测指标的表达结果进行相关性分析;将患者2、6个疗程化疗疗效分别与IPI评分、BLL-6、P-gp表达进行分析。  结果  BCL-6、P-gp高表达与IPI评分密切相关,其中BCL-6高表达与IPI评分呈负相关,P-gp阳性表达与IPI评分呈正相关;2个疗程化疗疗效与IPI评分无相关性,与BCL-6高表达呈负相关,与P-gp呈正相关;6个疗程化疗疗效与BCL-6阳性表达呈负相关,与P-gp呈正相关。  结论  在初诊DLBCL患者中,BCL-6高表达与良好预后相关,P-gp高表达则提示预后不良。      

Choi和Hans分型在弥漫大B细胞淋巴瘤预后评价中的意义

 目的　探讨Choi和Hans分型在弥漫大B细胞淋巴瘤（DLBCL）预后评价中的意义。方法　收集山西省肿瘤医院病理科有详细随访资料的DLBCL 99例,用免疫组织化学EnVision法检测bcl-2、bcl-6、CD10、FOXP1、GCET1、MUM-1的表达情况。根据Choi和Hans两种分类法分别将所有病例分型。其中35例应用荧光原位杂交技术检测bcl-6基因重排情况。结果　按Hans分类法生发中心B细胞（GCB）型21例,非GCB（nonGCB）型78例;按Choi分类法GCB型23例,nonGCB型76例。GCB型生存率明显优于nonGCB型,差异有统计学意义（P＝0.000）。FOXP1蛋白阳性表达与预后呈负相关（P＝0.011）,GCET1阳性表达则与预后呈正相关（P＝0.027）。在35例DLBCL患者中,bcl-6基因重排阳性高发于nonGCB型患者,bcl-6基因重排与bcl-6蛋白的表达没有明显相关性。结论　Choi和Hans两种分类法免疫分型GCB型预后都优于nonGCB型。bcl-6、FOXP1、GCET1的表达与预后有相关性。Choi及Hans分类法对DLBCL的免疫分型、临床预后估计均有应用价值。     

新疆维汉弥漫大B细胞淋巴瘤中Bcl-6 c-myc基因易位的差异性研究

  目的  探讨新疆维吾尔族、汉族弥漫大B细胞淋巴瘤（diffuse large B-cell lymphoma,DLBCL）患者Bcl-6、c-myc基因易位的差异及其临床意义。   方法  采用荧光免疫原位杂交（FISH）方法,对233例DLBCL活体石蜡切片进行Bcl-6、c-myc基因检测。观察Bcl-6、c-myc基因易位与DLBCL患者临床资料的关系,并对不同民族在不同亚型DLBCL中Bcl-6、c-myc基因易位的情况进行比较。   结果  233例DLBCL中,Bcl-6基因重排51例,占21.89%;c-myc基因重排39例,占16.74%;Bcl-6基因易位的表达与患者年龄、性别、发病部位、临床分期和LDH水平无显著相关（P＞0.05）,而与民族、IPI评分、结外侵犯、B症状、DLBCL不同亚型和近期疗效有相关性（P < 0.05）;c-myc基因易位的表达与患者年龄、性别、发病部位、临床分期、LDH水平和DLBCL不同亚型无明显相关性（P＞0.05）,而与民族、IPI评分、结外侵犯、B症状和近期疗效有相关性（P < 0.05）;维、汉不同民族GCB中Bcl-6、c-myc基因易位比较差异均无统计学意义（P＞0.05）;维、汉不同民族非生发中心活化B细胞（non-GCB）中Bcl-6、c-myc基因易位比较差异有统计学意义（P < 0.05）。   结论  Bcl-6,C-myc基因易位的表达与维、汉不同民族、IPI评分、结外侵犯、B症状和近期疗效有相关性;维、汉民族non-GCB亚组中Bcl-6、c-myc基因易位存在差异。      

bcl-6、p53、c-myc基因异常在弥漫大B细胞淋巴瘤中的临床意义

目的 探讨bcl-6 、p53、c-myc基因异常的检测在弥漫大B细胞淋巴瘤（DLBCL）中的临床意义.方法 间期荧光原位杂交（I-FISH）方法检测59例DLBCL患者活体石蜡组织bcl-6、p53蛋白、c-myc基因异常的情况,同时以CHOP及R-CHOP方案化疗,评价疗效.观察bcl-6、p53蛋白、c-myc基因与化疗疗效及生存期的关系.结果 59例DLBCL中,p53丢失18例（30.5％）,bcl-6重排11例（18.6％）,c-myc重排5例（8.5％）.p53丢失阳性组化疗有效率（33.3％）明显低于阴性组（76.5％）（x2=9.560,P=0.002）. bcl-6基因重排阳性组的预后差于基因重排阴性组,但差异无统计学意义[总生存（OS）,P=0.107;无进展生存时间（PFS）,P=0.094]; p53基因丢失阳性组预后明显差于阴性组（OS,P=0.031;IPFS,P=0.028）;c-myc重排阳性组的预后差于基因重排阴性组,但差异无统计学意义（OS,P=0.163;PFS,P=0.167）.其中CHOP化疗组患者,p53基因丢失、c-myc重排阳性组的预后明显差于阴性组,差异有统计学意义（P值均＜ 0.05）;R-CHOP化疗组,bcl-6基因重排阳性组具有较差的预后意义（OS,P=0.003;PFS,P=0.007）.结论 bcl-6 、p53、c-myc基因异常与 DLBCL预后密切相关,可作为预测DLBCL的预后因素并指导治疗.     

弥漫大B细胞性淋巴瘤中t(14;18)易位及BCL2表达的意义

  目的  探讨弥漫大B细胞性淋巴瘤(DLBCL)中t(14;18)易位及BCL2表达的意义。  方法  用石蜡包埋组织免疫组织化学法检测142例淋巴结、胃肠道和咽淋巴环等不同器官或部位发生的DLBCL中CD10、BCL6、MUM1和BCL2的抗原表达, 按免疫表型将DLBCL分成GCB-DLBCL和非GCB-DLBCL两个亚型; 聚合酶链反应(PCR)扩增75例淋巴结结内DLBCL新鲜组织中由t(14;18)易位所形成的MBR/JH和lnfr/JH重组基因。  结果  142例DLBCL中, 75例(52.8%)表达BCL2。分型为GCB-DLBCL的51例中, 18例(35.3%)表达BCL2;分型为非GCB-DLBCL的91例中, 57例(62.6%)表达BCL2, 两者阳性率比较有显著性差异(P=0.002)。同时, BCL2的表达阳性率按不同器官或部位发生的DLBCL作比较, 结果也存在显著性差异(P=0.01)。18.7%的淋巴结结内DLBCL中有t(14;18)易位, 阳性病例主要见于GCB-DLBCL之中。  结论  t(14;18)易位是GCB—DLBCL亚型的遗传学特征, BCL2表达在不同亚型和不同器官或部位发生的DLBCL中有显著性差异。      

CYP2A6基因多态性对胃癌术后含S-1辅助化疗方案疗效的影响

  目的  S-1（替吉奥）的活性前体为替加氟,主要通过细胞色素P450酶2A6（human cytochrome P450,family 2,subfamily A,polypeptide 6,CYP2A6）代谢为5-FU而发挥细胞毒作用。本研究探讨CYP2A6基因多态性与胃癌术后患者含S-1辅助化疗方案疗效的相关性。  方法  选取2007年11月至2013年5月于郑州市人民医院收治的胃癌患者200例,给予标准给药方案。在CYP2A6基因分析中,选取野生型的CYP2A6*1,突变型的CYP2A6*4、*7、*9、*10等位点进行分析。  结果  200例患者中位随访时间为46.4（12.5~80.1）个月。野生型（W/W）3年无复发生存（relapse free survival,RFS）率为95.9%、突变杂合子（W/V）型为83.1%、突变纯合子（V/V）型为72.5%（P=0.032）。不同基因型之间的3~4级不良反应的差异无统计学意义（P=0.628,P=0.227）。  结论  CYP2A6基因型与含S-1化疗方案的长期疗效有关,突变型患者的3年RFS降低。      

弥漫大B细胞淋巴瘤免疫表型及临床参数与其预后的关系

目的探讨采用R-CHOP方案治疗的弥漫大B细胞淋巴瘤(DLBCL)的免疫表型及临床参数与其预后的关系。方法采用免疫组化SP法,检测57例DLBCL中CD10、bcl-6、MUMl和CD5的表达,根据Hans分型将其分为GCB型和non-GCB型。结果 57例DLBCL中表达CD10、bcl-6、MUM1和CD5分别有9例(15.8%)、36例(63.2%)、34例(59.6%)、4例(7.0%);GCB型17例(29.8%)、non-GCB型40例(70.2%)。57例DLBCL中死亡19例,GCB型预后与non-GCB型相比差异无统计学意义(P=0.132);CD5阳性患者死亡率高,但与CD5阴性者相比差异无统计学意义(P=0.594)。Ⅲ~Ⅳ期和年龄>60岁DLBCL患者死亡率高(P=0.001、P=0.017)。结论应用R-CHOP方案治疗的DLBCL其预后与患者年龄和肿瘤临床分期有关,与Hans分型无关。     

原发性睾丸DLBCL临床病理特征和免疫表型分析

目的 探讨原发性睾丸弥漫大B细胞性淋巴瘤（DLBCL）的临床病理和免疫表型特征。方法分析10例原发性睾丸DLBCL的临床病理特点;免疫组织化学检测CD10、Bcl-6、MUM1、Bcl-2和Ki-67的表达,并进一步区分其生发中心B细胞(GCB)或非GCB细胞免疫表型。 结果 10例患者平均年龄65岁（51~79岁）,Ⅰ~Ⅱ期8例（87.5%）。失访3例,6例患者在发病后5~42月内复发或死亡。CD10、Bcl-6、MUM1、Bcl-2的表达率依次为0,50%,70%,100%。9例显示非GCB细胞免疫表型,1例显示GCB免疫表型。Ki-67平均指数70%。结论 原发性睾丸弥漫大B细胞性淋巴瘤显示非GCB细胞免疫表型特征及Bcl-2和Ki-67高表达可能与其不良预后有关。     

瘦素受体和磷酸化信号转导与转录激活因子3在弥漫大B细胞淋巴瘤中的表达及其意义

 【摘要】　目的　探讨瘦素受体（OBR）和磷酸化信号转导与转录激活因子（p-STAT3）在弥漫大B细胞淋巴瘤（DLBCL）中的表达及其与DLBCL免疫表型和临床特征的关系。方法　应用免疫组织化学方法检测80例DLBCL和10例反应性增生淋巴结（RLH）组织中OBR和p-STAT3的表达,并应用免疫组织化学方法检测DLBCL的CD20、CD10、bcl-6、Mum-1免疫标志,根据Hans分型方法将DLBCL分为生发中心B细胞样（GCB）型和非生发中心B细胞样（non-GCB）型。结果　OBR和p-STAT3在DLBCL中的高表达率分别为45.0 %（36／80）和28.8 %（23／80）,在RLH中均低表达,差异均有统计学意义（均P＜0.05）。p-STAT3在non-GCB型中高表达率为36.8 %（21／57）,明显高于GCB型的8.7 %（2／23）（P＜0.05）,OBR与DLBCL的免疫表型无关（P＞0.05）。OBR及p-STAT3在DLBCL临床Ⅲ、Ⅳ期中的高表达率分别为61.9 %（13／21）和38.1 %（8／21）,高于Ⅰ、Ⅱ期[46.2 %（18／39）和25.6 %（10／39）],但差异无统计学意义（P＞0.05）。OBR和p-STAT3的表达与患者年龄、性别、结外浸润、乳酸脱氢酶水平、B症状及国际预后指数（IPI）评分无关（P＞0.05）。OBR和p-STAT3在DLBCL中的表达呈正相关（r＝0.232,P＝0.039）。结论　OBR可激活JAK-STAT信号途径、促进STAT3磷酸化过程,其可能参与DLBCL的发病和non-GCB型DLBCL的进展。     

R-CHOP regimen can significantly decrease the risk of disease relapse and progression in patients with non-germinal center B-cell subtype diffuse large B-cell lymphoma

To further explore the role of rituximab when added to the CHOP-like regimen in the treatment of immunohistochemically defined non-germinal center B-cell subtype (non-GCB) diffuse large B-celllymphoma (DLBCL), 159 newly diagnosed DLBCL patients were studied retrospectively based on the immunohistochemical evaluation of CD10, Bcl-6, MUM-1, and Bcl-2. Altogether, 110 patients underwent the CHOP-like regimen, and rituximab was added for the other 49 patients. Cox regression analysis showed that compared with the CHOP-like regimen, the rituximab-based regimen (R-CHOP regimen)significantly decreased the risk of disease relapse and progression in CD10-negative patients (P=0.001),Bcl-6-negative patients (P=0.01), and MUM-1-positive patients (P=0.003). The risk of disease relapse in patients with non-GCB subtype (P=0.002) also decreased. In contrast, patients with the opposite immunohistochemical marker expression profile and GCB subtype did not benefit from treatment with the R-CHOP regimen. In addition, non-GCB subtype patients had a significantly higher expression rate of Bcl-2 than GCB subtype patients (P=0.042). Although univariate analysis found that both Bcl-2-positive and-negative patients had significantly higher event-free survival rates with the R-CHOP regimen, only Bcl-2 positivity (P=0.004) maintained significance in the Cox regression analysis. We conclude that the addition of rituximab can significantly improve the prognosis of patients with non-GCB subtype DLBCL, which is closely related to the expression of CD10, Bcl-6, MUM-1, and Bcl-2.     

R-CHOP和CHOP方案治疗两种亚型弥漫大B细胞淋巴瘤患者的近期疗效

背景与目的：根据肿瘤细胞起源不同,可将弥漫大B细胞淋巴瘤（diffuselarge Bcelllymphoma,DLBCL）分为生发中心来源（germinalcenter Bcell like,GCB）及非生发中心来源（non-GCB）两种亚型。在以CHOP方案为标准的化疗基础上,前者预后优于后者。本研究通过比较R-CHOP（Rituximab联合CHOP）和CHOP方案治疗不同亚型DLBCL患者的近期疗效,寻找初诊DLBCL患者最佳一线治疗方案。方法：将2006年11月至2008年2月中山大学肿瘤防治中心内科收治的83例初治DLBCL患者分为GCB和non-GCB两组。按照修订版淋巴瘤疗效评价标准,比较接受R-CHOP或CHOP方案治疗患者的近期疗效;观察Bcl-2在两种亚型中的表达情况,并分析其与近期疗效的关系。结果：83例DLBCL患者中GCB组35例（42．2％）,non-GCB组48例（57．8％）。GCB组一线化疗近期总缓解率74．3％,non-GCB组60．4％,两组相比差异有显著性（P=0．006）。Bcl-2在GCB和non-GCB两亚组的表达差异没有显著性：Bcl-2阳性患者采用R．CHOP方案治疗的近期缓解率（75．6％）明显高于用CHOP方案治疗者（47．8％）,两组相比差异有显著性（P=0．031）：采用不同方案化疗的Bcl-2阴性患者的近期缓解率则差异无显著性（P〉0．05）。结论：GCB组患者接受标准R—CHOP或CHOP方案治疗近期缓解率高于non-GCB组,提示预后良好。加用Rituximab可提高Bcl-2阳性患者的近期缓解率。     

Comparison of the expression and prognostic significance of differentiation markers between diffuse large B-cell lymphoma of central nervous system origin and peripheral nodal origin.

PURPOSE: Whether diffuse large B-cell lymphoma (DLBCL) of primary central nervous system origin (PCNSL) is biologically different from DLBCL of peripheral nodal origin (NL) remains unclear. The purpose of this study was to compare the expression frequencies and prognostic significance of a panel of cell differentiation markers between these two disease entities. EXPERIMENTAL DESIGN: This study included HIV-unrelated patients with PCNSL (n = 51) and NL (n = 72) treated at four hospitals in Taiwan for whom archival tumor tissue was available. Immunohistochemistry for CD10, BCL-6, MUM-1, vs38c, CD138, and BCL-2 was done. CD10, BCL-6, and MUM-1 expression results were used to classify all cases into the germinal center B-cell (GCB) or the non-GCB subgroup. The prognostic significances of clinical and immunophenotypic markers were evaluated. RESULTS: Nuclear MUM-1 expression was significantly higher in PCNSL than in NL (P < 0.001; 84% versus 53%). PCNSL tumors were more frequently classified into the non-GCB subgroup than NL tumors (P = 0.020; 78% versus 62%). For patients with PCNSL, univariate analysis showed that patients with BCL-6 expression had a trend towards longer survival (P = 0.073; median survival, 25.3 versus 7.3 months), and multivariate analysis showed BCL-6 was an independent prognostic factor (P = 0.026). For patients with NL, both of univariate (P = 0.003) and multivariate analyses (P = 0.002) showed that GCB was significantly associated with favorable survival. CONCLUSION: The higher frequency of non-GCB subclassification, which was mainly contributed by nuclear MUM-1 expression in PCNSL implies that it has a more differentiated cellular origin than NL. BCL-6 expression in patients with PCNSL and GCB subgroup in patients with NL were favorable prognostic factors.     

Prognostic impact of immunohistochemical biomarkers in diffuse large B-cell lymphoma in the rituximab era

We evaluated the usefulness of prognostic markers in patients with diffuse large B-cell lymphoma (DLBCL) treated with cyclophosphamide, vincristine, doxorubicin, and prednisolone (CHOP) ± rituximab (R-CHOP) in Japan. We studied 730 patients with DLBCL; 451 received CHOP and 279 R-CHOP. We analyzed biopsy samples immunohistochemically for markers of germinal center B cells (CD10, Bcl-6), postgerminal center B cells (Multiple myeloma-1), and apoptosis (Bcl-2). The median follow-up period for surviving patients was 56.4 months for the CHOP group and 25.2 months for the R-CHOP group. DLBCL were categorized as germinal center B (GCB) subtype (352/730; 48.2%) or non-GCB subtype (378/730; 51.8%). In the CHOP group, the high expression of CD10 ( P  = 0.022) or Bcl-6 ( P  = 0.021), or GCB subtype ( P  = 0.05) was associated with better overall survival, whereas the high expression of Bcl-2 ( P  = 0.001) or MUM1 ( P  = 0.011), or non-GCB subtype ( P  = 0.05) was associated with worse overall survival. In the R-CHOP group, however, these biomarkers except Bcl-6 were not significant prognostic factors. The patients with non-GCB subtype showed improved survival in the R-CHOP group ( P  = 0.756). The International Prognostic Index was a useful clinical marker of survival in the CHOP group ( P  < 0.001) and also in the R-CHOP group ( P  < 0.001). Results of improved survival with rituximab addition indicate that the relevance of previously recognized prognostic factors should be re-evaluated. ( Cancer Sci  2009; 100: 1842–1847)     

乳腺弥漫大B细胞淋巴瘤临床特点及预后分析

目的:探讨乳腺弥漫大B细胞淋巴瘤（DLBCL）患者的临床特征及预后。方法:回顾性分析2014年5月起至2018年12月我院收治的18例乳腺DLBCL患者的临床特点及预后。结果:在18例患者中,17例为女性,中位年龄为57岁,病变主要累及右侧乳腺（11/18,61.1%）。将其分为原发性乳腺DLBCL（PB-DLBCL）和继发性乳腺DLBCL（SB-DLBCL）两大类。11例（57.6%）PB-DLBCL与7例（42.4%）SB-DLBCL相比,其具有Ann Arbor分期多为Ⅰ-Ⅱ期（P＜0.01）、B症状少（P=0.013）、相对更高的白细胞计数（P=0.041）、骨髓未累及（P=0.043）、完全缓解（CR）率高（P=0.049）等特点。生存分析发现PB-DLBCL患者5年总生存期（OS）显著长于SB-DLBCL患者（P=0.013）。本研究以非生发中心B细胞型（non-GCB）居多,生发中心型（GCB）与non-GCB型之间OS无显著差异（P=0.885）。所有获得CR患者的生存期均显著延长（P=0.008）。结论:乳腺DLBCL多见于中年女性,以右侧乳腺肿块为主要临床表现,分子分型多为non-GCB型。与SB-DLBCL患者相比,PB-DLBCL患者具有Ann Arbor分期早、B症状少、相对更高的白细胞计数、骨髓未累及、CR率高等特点,并且生存期显著延长。无论是PB-DLBCL和SB-DLBCL,还是GCB型和non-GCB型,获得CR提示预后良好。     

miR-320d与弥漫大B细胞淋巴瘤预后的相关性研究

目的 探讨miR-320d表达与弥漫大B细胞淋巴瘤（DLBCL）预后的关系.方法 应用EnVision法对山西省肿瘤医院有随访资料的原发于淋巴结的DLBCL 62例石蜡标本进行CD20、CD3、CD10、bcl-6、Mum-1免疫标记检测,根据Hans分类方法将DLBCL分为生发中心B细胞（GCB）型和非生发中心B细胞（non-GCB）型.采用安捷伦16.0高密度芯片对24例DLBCL石蜡标本进行miRNA表达谱筛选,用实时荧光定量PCR方法对62例DLBCL石蜡标本进行miR-320d表达验证.将1 1例淋巴结反应性增生标本作为对照.结果 62例DLBCL中,GCB型22例（35.5％）,non-GCB型40例（64.5％）,GCB型miR-320d表达水平是non-GCB型的3.43倍（P=0.034）.miR-320d在对照组的表达量是DLBCL的5.65倍（P＜ 0.001）.单因素分析示DLBCL中miR-320d低表达组总生存期低于高表达组,差异有统计学意义（P=0.021）.多因素Cox回归模型分析示62例DLBCL中,miR-320d低表达（RR=2.434,95％CI1.148～5.159,P=0.020）为独立于国际预后指数（IPI）的预后不良因素.结论 miR-320d表达下调预示DLBCL预后不良.     

Low incidence of BCL-6 gene alterations for diffuse large B-cell lymphomas in Taiwan Chinese

BACKGROUND: In Western populations, rearrangement of the BCL-6 gene can be identified in 20-40% of patients with diffuse large B-cell lymphoma (DLBCL). Analysis of the BCL-6 gene has revealed the presence of point mutations or small deletions in 70% of DLBCL tumors; however, few studies have investigated BCL-6 gene alteration in patients with non-Hodgkins lymphoma (NHL) of Chinese descent. METHODS: Samples from 135 Taiwanese patients with NHL were examined (28 samples of T-cell NHL and 107 samples of B-cell NHL; 59 samples from patients with DLBCL) for gene rearrangement and mutation of the BCL-6 proto-oncogene using Southern blot analysis and single-strand conformation polymorphism (SSCP) followed by sequence analysis. RESULTS: BCL-6 rearrangement and point mutations were found in 14.8% of patients (n = 20) and in 7.4% of patients (n = 10), respectively. All BCL-6 gene alterations occurred in patients with B-cell NHL, and none occurred in patients with T-cell NHL. Among the 59 patients with DLBCL, BCL-6 gene rearrangements were identified in 10 patients (16.9%), and mutations were identified in 8 patients (13.6%), with the BCL-6 mutation occurring independent of the BCL-6 rearrangement. The incidence of BCL-6 gene rearrangement and mutations in patients with extranodal DLBCL was 9.5% (2 of 21 patients) and 23.8% (5 of 21 patients), respectively. Univariate analysis and multivariate logistic regression found no association between BCL-6 gene alternations and clinical characteristics, including extranodal tumors in patients with DLBCL, and no association between the BCL-6 alterations and prognosis was found. CONCLUSIONS: The incidence of BCL-6 alterations was lower in Taiwanese patients with DLBCL compared with Western populations, and BCL-6 gene alterations showed no prognostic significance in patients with DLBCL.