Prevalence and Clinical Implications of Epstein Barr Virus ...Chi Young Ok 1, Ling Li , Zijun Y....

Human Cancer Biology

Prevalence and Clinical Implications of Epstein–Barr VirusInfection in De Novo Diffuse Large B-Cell Lymphoma inWestern Countries

Chi Young Ok1, Ling Li1, Zijun Y. Xu-Monette1, Carlo Visco12, Alexander Tzankov14, Ganiraju C. Manyam2,Santiago Montes-Moreno15, Karen Dybaer16, April Chiu4, Attilio Orazi5, Youli Zu3, Govind Bhagat6,Jiayu Chen18, Kristy L. Richards7, Eric D. Hsi8, William W. L. Choi19, J. Han van Krieken20, Jooryung Huh21,Weiyun Ai9, Maurilio Ponzoni13, Andr�es J.M. Ferreri13, John P. Farnen10, Michael B. M�ller17,Carlo E. Bueso-Ramos1, Roberto N. Miranda1, Jane N. Winter11, Miguel A. Piris15, L. Jeffrey Medeiros1, andKen H. Young1

AbstractPurpose: Epstein–Barr virus–positive (EBVþ) diffuse large B-cell lymphoma (DLBCL) of the elderly is a

variant of DLBCL with worse outcome that occurs most often in East-Asian countries and is uncommon in

the Western hemisphere. We studied the largest cohort of EBVþ DLBCL, independent of age, treated withrituximab combined with CHOP (R-CHOP) in developed Western countries.

Experimental design: A large cohort (n ¼ 732) of patients with DLBCL treated with R-CHOPchemotherapy is included from the multicenter consortium. This study group has been studied for

expression of different biomarkers by immunohistochemistry, genetic abnormalities by FISH andmutation

analysis, genomic information by gene expression profiling (GEP), and gene set enrichment analysis

(GSEA).

Results: Twenty-eight patients (4.0%) were positive for EBV with a median age of 60.5 years. No clinical

characteristics distinguished patients with EBVþ DLBCL from patients with EBV-negative (EBV�) DLBCL.Genetic aberrations were rarely seen. NF-kB p50, phosphorylated STAT-3, and CD30weremore commonlyexpressed in EBVþDLBCLs (P < 0.05). Significant differences in survival were not observed in patients withEBVþ DLBCL versus EBV� DLBCL. However, CD30 expression combined with EBV conferred an inferioroutcome. GEP showed a unique expression signature in EBVþ DLBCL. GSEA revealed enhanced activity ofthe NF-kB and JAK/STAT pathways independent of molecular subtype.Conclusions: The clinical characteristics of patients with EBVþ versus EBV� DLBCL are similar and

EBV infection does not predict a worse outcome. EBVþ DLBCL, however, has a unique genetic signature.CD30 expression is more common in EBVþ DLBCL and, consistent CD30 and EBV is associated with anadverse outcome. Clin Cancer Res; 20(9); 2338–49. �2014 AACR.

IntroductionEpstein–Barr virus–positive (EBVþ) diffuse large B-cell

lymphoma (DLBCL) of the elderly is defined in the 2008World Health Organization (WHO) classification as an

EBVþmonoclonal large B-cell lymphoproliferative disorderin immunocompetent patients >50 years of age (1). Themedian age of patients with these tumors is 71 years (range,50–91), but younger patients can be affected (2, 3). The

Authors' Affiliations: Departments of 1Hematopathology and 2Biostatis-tics and Bioinformatics, The University of Texas MD Anderson CancerCenter; 3The Methodist Hospital, Houston, Texas; 4Memorial Sloan-Ket-tering Cancer Center; 5Weill Medical College of Cornell University; 6Colum-bia University Medical Center and New York Presbyterian Hospital, NewYork, New York; 7University of North Carolina School of Medicine, ChapelHill, North Carolina; 8Cleveland Clinic, Cleveland, Ohio; 9University ofCalifornia San Francisco School of Medicine, San Francisco, California;10Gundersen Lutheran Health System, La Crosse, Wisconsin; 11FeinbergSchool of Medicine, Northwestern University, Chicago, Illinois; 12SanBartolo Hospital, Vicenza; 13San Raffaele H. Scientific Institute, Milan,Italy; 14University Hospital, Basel, Switzerland; 15Hospital UniversitarioMarques de Valdecilla, Santander, Spain; 16Aalborg University Hospital,Aalborg; 17Odense University Hospital, Odense, Denmark; 18MedicalSchool of Taizhou University, Taizhou, Zhejiang; 19University of HongKong Li Ka Shing Faculty of Medicine, Hong Kong, China; 20Radboud

University Nijmegen Medical Centre, Nijmegen, the Netherlands; and21AsanMedical Center, UlsanUniversity College ofMedicine, Seoul, Korea

Note: Supplementary data for this article are available at Clinical CancerResearch Online (http://clincancerres.aacrjournals.org/).

C.Y. Ok, L. Li, Z.Y. Xu-Monette, and K.H. Young contributed equally to thisarticle.

Corresponding Author: Ken H. Young, The University of Texas MDAnderson Cancer Center, Department of Hematopathology, 1515 Hol-combe Boulevard, Houston, Texas 77030-4009. Phone: 713-745-2598;Fax: 713-792-7273. E-mail: [email protected]

doi: 10.1158/1078-0432.CCR-13-3157

�2014 American Association for Cancer Research.

ClinicalCancer

Research

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reported prevalence of EBV ismore frequent in East Asia andMexico compared with Western countries, but this concepthas been challenged (4–8). Of note, no consensus has beenreached about the definition or criteria, including a meth-odology to detect EBV infection, separation of EBVþ tumorcells from EBVþ background cells, or cutoff for EBVþ cellsfor EBV positivity. The lack of consensus may impact differ-ences in the reported prevalence. Lymph nodes are com-monly involved (�70%), and extranodal sites of involve-ment are not uncommon (3).Although prognostic significance has not been demon-

strated, twomorphologic variants,monomorphic andpoly-morphic, have been recognized. Recently, Montes-Morenoand colleagues subdivided the polymorphic subtype basedon the relative proportion of large neoplastic cells and thepresence of Hodgkin Reed-Sternberg–like cells into threegroups: (i) canonical large B-cell neoplasm, (ii)DLBCLwithHodgkin lymphoma–like features, and (iii) DLBCL withpolymorphic lymphoproliferative disorder–like features(9). Immunophenotypically, most cases have activated B-cell phenotype. EBV latent membrane protein 1 (LMP1) isexpressed in more than 90% of cases, which denotes EBVlatency type II. EBV nuclear antigen 2 (EBNA2), seen in EBVlatency type III, is expressed in approximately 15% to 30%of cases. Specific cytogenetic and genomic aberrations arenot known.In reports from East Asia, South America, and Europe, a

poor outcome has been observed in patients with EBVþ

DLBCL of the elderly (5, 8, 10, 11). In these studies,however, many patients were treated with cyclophospha-mide, hydroxydoxorubicin, vincristine, and prednisone(CHOP) and not rituximab (R)-CHOP. Therefore, the effectof R-CHOP immunochemotherapy in patients with EBVþ

DLBCL of the elderly is largely unknown. In this study, we

assessed the effect of EBV infection in a large cohort ofpatients with DLBCL treated with R-CHOP in Westerndeveloped countries.

Materials and MethodsPatients

A total of 732 cases (training set, n ¼ 500 and validationset, n ¼ 232) of de novo DLBCL treated with R-CHOP wereevaluated. Formalin-fixed and paraffin-embedded lympho-ma samples were a part of the International DLBCL Ritux-imab-CHOP Consortium Program Study. All cases werereviewed by a group of hematopathologists (A. Tzankov,M.B.M�ller,M.A.Piris, andK.H.Young) andwerediagnosedaccording to the WHO criteria. DLBCLs transformed from alow-grade B-cell lymphoma or associated with acquiredimmunodeficiency (e.g., HIV infection), primary cutaneousDLBCLs, primary central nervous system DLBCLs, and pri-marymediastinal large B-cell lymphomaswere excluded.Wedidnot excludepatients younger than50years.Morphologicvariants of EBVþ DLBCL were classified as described byMontes-Moreno and colleagues (9). This study was con-ducted in accordance with the Declaration of Helsinki andwas approved by the Institutional Review Boards (IRB) of allparticipating collaborative institutions (12, 13). The overallstudywas approvedby the IRB at TheUniversity of TexasMDAnderson Cancer Center (Houston, TX).

Immunohistochemistry and in situ hybridizationmethods

Tissue microarrays (TMAs) were constructed as describedpreviously (12, 13). Immunohistochemical analysis (IHC)for various markers and in situ hybridization (ISH) for EBV-encoded RNA (EBER) were performed. Evaluated IHC mar-kers were B-cell lymphoma 2 (BCL2), B-cell lymphoma 6(BCL6), CD10, CD30, forkhead box protein P1 (FOXP1),germinal center B cell-expressed transcript-1 (GCET1), E3ubiquitin-protein ligase Mdm2 (MDM2), protein Mdm4(MDM4), multiple myeloma oncogene 1 (MUM1), EBVlatent membrane protein 1 (LMP1, ThermoFisher Scientific,Rockford, IL), EBV nuclear antigen 2 (EBNA2, Abcam, Cam-bridge, MA), Myc, NF-kB components (p50, p52, p65, RelB,and c-Rel), p53, and phosphorylated STAT3 (pSTAT3).Receiver-operating characteristic (ROC) curve analysis,described previously (14), was utilized to assess a cutoff withmaximum sensitivity and specificity for each marker. Whenan optimal cutoff could not be determined by ROC curveanalysis, a conventional cutoff value for individual markerswas decided on the basis of a literature review. The cutoffscores for these markers were as follows: 10% for LMP1,MDM2,MDM4, and EBER; 20% for CD30 and p53; 30% forCD10, BCL6, and pSTAT3; 40% for Myc; 60% for GCET1,MUM1, and FOXP1; and 70% for BCL2. Any nuclear expres-sion of each NF-kB component was considered positive.

Gene expression profiling and gene set enrichmentanalysis

Total RNA was extracted from 474 formalin-fixed, paraf-fin-embedded tissue samples in the training set using the

Translational RelevanceEpstein–Barr virus–positive (EBVþ) diffuse large B-cell

lymphoma (DLBCL) is a genetically unique subgroup ofDLBCL with activated canonical NF-kB and JAK/STATpathways. CD30 is more commonly expressed in thissubset compared with DLBCL without EBV infection.The disease has been reported to have inferior outcomecompared with DLBCL without EBV infection, but asignificant proportion of data was gleaned from patientstreated with cyclophosphamide, hydroxydaunorubicin,vincristine, and prednisone (CHOP). In our group ofpatients in Western developed countries treated withrituximab combined with CHOP (R-CHOP), EBV infec-tion determined by positive expression of EBV-encodedsmall RNA (EBER) in tumor cells did not predict inferioroutcome. However, CD30 coexpression with EBER sug-gests a poorer prognosis. This study provides a strongrationale for using anti-CD30 therapy, brentuximabvedotin (Adcetris), in patients whose tumors coexpressCD30 and EBER.

Prevalence and Clinical Implications of EBVþ DLBCL

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High Pure RNA Extraction Kit (Roche Applied Science) andsubjected to gene expression profiling (GEP) as describedpreviously (14). We used the DQN algorithm, which is thenoncentral trimmed mean of differences between perfectmatch and mismatch intensities with quantile normaliza-tion, for data analysis and classification (15). DQN wasnormalized with beta distribution and a Bayesian modelwas used to determine the classification probability. Themethodology developed in this study has been validatedwith the Lymphoma Leukemia Molecular Profiling Pro-gram dataset in the Gene Expression Omnibus GenomicsSpatial Event database #10846, which has 181 CHOP-treated and 233 R-CHOP–treated patients with DLBCL. Weobtained an 80% concordance rate of classification for allthree classes, germinal center B-cell (GCB), activated B-cell(ABC), and unclassified, and a 97% rate for GCB and ABC(excluding unclassified). Cell-of-origin (COO) classifica-tion was established by GEP (considered the "gold stan-dard") and/or in combinationwith IHCdata.WhenCOO isnot classifiable with GEP, it was determined by IHC accord-ing to Visco-Young (the first choice) and Choi (the secondchoice) algorithms (14, 16). The correlation between GEPand IHC for COO classification was 86.3% overall (17).

Gene set enrichment analysis (GSEA)wasperformedwithGSEA application (Broad Institute at MIT, Cambridge, MA)using Kyoto Encyclopedia of Genes and Genomes (KEGG)pathway gene sets and the curated gene sets from theMolecular Signature Database. Gene sets with a false dis-covery rate q value

aberrations involving BCL2, BCL6, MYC, MDM2, MDM4,and TP53 were infrequently observed in EBVþ DLBCLs. Ofnote, no cases of EBVþ DLBCL showed rearrangements ofbothMYC andBCL2. Inmultivariate analysis, EBVpositivitydid not have an increased HR (Table 3).

Expression of NF-kB components and phosphorylatedSTAT3 in EBVþ DLBCLComponents of NF-kB (p50, p65, and c-Rel) and pSTAT3

were assessed by IHC. Expression of p50 was more com-monly observed in EBVþ DLBCLs compared with EBV�

DLBCLs (65.2% vs. 35.9%, P ¼ 0.007). In contrast, expres-sionof p65 and c-Rel showednodifference between the twogroups. These findings could suggest that the canonical NF-kB pathway is activated using both p65 and c-Rel as dimer-ization partners for p50. Of note, nuclear expression ofcanonical NF-kB molecules was also expressed in GCBsubtype of EBVþ DLBCLs (55.6%, 54.8%, and 33.3% for

p50, p65, and c-Rel, respectively), suggesting EBV-associat-ed canonical NF-kB induction. However, single LMP1 orEBNA2 did not show significant correlation with any of theNF-kB molecules (all P > 0.05). pSTAT3 was more com-monly expressed in EBVþ DLBCLs compared with EBV�

DLBCLs (56.5% vs. 34.9%, P ¼ 0.044). However, pSTAT3did not show significant correlation with LMP1 (P > 0.05).

CD30 expression predicts adverse outcome in patientswith EBVþ DLBCL

Our group previously found that coexpression of CD30and EBER in de novo DLBCLs harbors poor prognosis (12).To evaluate the effect of CD30 in EBVþDLBCL, we analyzedfour groups based on expression of EBER and CD30. CD30expression was significantly higher in EBVþ DLBCLs com-pared with EBV� DLBCLs (42.9% vs. 15.5%, respectively,P¼ 0.001). In EBERþ/CD30�patients,OS and PFSwere notsignificantly different from EBER�/CD30� DLBCL (P ¼

Table 1. Clinical characteristics and outcomeof 732 cases ofde novoDLBCL treatedwithR-CHOP regimen

All patients (n ¼ 732) EBVþ (n ¼ 28) EBV� (n ¼ 675) PMedian age 63.0 (16.0–95.0) 60.5 (35.0–86.0) 63.5 (16.0–95.0) 0.426Gender

Male 421 (57.5%) 18 (64.3%) 387 (57.3%)Female 311 (42.5%) 10 (35.7%) 288 (42.7%) 0.560

Age�60 313 (42.8%) 14 (50.0%) 283 (41.9%)>60 419 (57.2%) 14 (50.0%) 392 (58.1%) 0.438

B symptomsAbsence 423 (64.4%) 14 (58.3%) 397 (64.8%)Presence 234 (35.6%) 10 (41.7%) 216 (35.2%) 0.521

ECOG performance status

0.560 and P ¼ 0.343 for OS and PFS, respectively; Fig. 2Aand B). However, when CD30 was coexpressed with EBERin DLBCL, a worse outcome in OS, but not PFS, wasobserved compared with EBER�/CD30� (P ¼ 0.014 andP ¼ 0.257 for OS and PFS, respectively; Fig. 2C and D).Comparing EBERþ/CD30þ DLBCL with EBERþ/CD30�

DLBCL, inferior outcome in OS, but not in PFS, was seenin the former (P ¼ 0.042 and P ¼ 0.145 for OS and PFS,respectively; Fig. 2E and F). EBERþ/CD30þ DLBCLs hadsignificantly poorer outcomes compared with EBER�

/CD30þ counterparts (P < 0.001 and P ¼ 0.001 for OS andPFS, respectively; Fig. 2G and H).

Gene expression signature and GSEA of EBVþ DLBCLWeevaluatedGEP signaturesof EBVþ andEBV�DLBCL to

better understandmolecular mechanisms involved in EBVþ

DLBCL (Fig. 3A). A total of 24 genes were differentiallyexpressed between the two groups. In EBVþ DLBCL, sevengenes were upregulated and 17 genes were downregulated(Supplementary Table S1). Among the upregulated genes,

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Figure 1. Impact of EBV infection on overall and PFS of patients with DLBCL. A and B, in the training set (n¼ 500), OS and PFS were not significantly differentbetween EBVþ DLBCL and EBV� DLBCL (P ¼ 0.189 and P ¼ 0.687, respectively). C, lack of difference in OS between EBVþ DLBCL and EBV� DLBCLwas reproduced (P ¼ 0.849) in the validation set (n ¼ 232). D, combining the training set and validation set, OS was not significantly different betweenEBVþ DLBCL and EBV� DLBCL (P ¼ 0.192). E and F, EBV positivity in DLBCL also failed to show any significant difference in cases of GCB versus ABCphenotype, OS (P ¼ 0.650 and P ¼ 0.290, respectively).

Ok et al.

Clin Cancer Res; 20(9) May 1, 2014 Clinical Cancer Research2342




FTH1, PDXK, MRPL44, P4HB, and ENTPD6 were notewor-thy. FTH1 is a known NF-kB target gene that denotes anactivated NF-kB pathway. PDXK is positively related to cellproliferation. MRPL44 involves cell-cycle regulation andP4HB and ENTPD6 are involved in cellmetabolism. Among

the downregulated genes, MIR17HG, MOCOS, and EYA4were prominent. Downregulation of MIR17HG has beenshown in CD30þ DLBCL by Hu and colleagues (12), andour finding underscores an association between CD30expression and EBV infection. MOCOS sulfurates the

Table 2. Protein expression and genetic aberrations of 732 cases of de novoDLBCL treated with R-CHOPregimen

All patients (n ¼ 732) EBVþ (n ¼ 28) EBV� (n ¼ 675) PCOO classGCB 370 (51.0%) 11 (39.3%) 342 (51.0%) —ABC 355 (49.0%) 17 (60.7%) 329 (49.0%) 0.251

CD30 118 (16.4%) 12 (42.9%) 103 (15.5%) 0.001NF-kBp50 237 (36.9%) 15 (65.2%) 220 (35.9%) 0.007p65 191 (28.6%) 7 (25.9%) 182 (28.8%) 0.831c-Rel 148 (23.2%) 5 (21.7%) 139 (22.8%) 1.000

pSTAT3 221 (35.5%) 13 (56.5%) 206 (34.9%) 0.044BCL2 protein 359 (49.9%) 11 (39.3%) 339 (50.6%) 0.254BCL6 protein 537 (75.1%) 14 (50.0%) 507 (76.1%) 0.003p53 protein 260 (36.9%) 8 (34.8%) 240 (36.5%) 1.000MDM2 protein 202 (42.3%) 12 (63.2%) 179 (40.7%) 0.059MDM4 protein 468 (97.7%) 18 (94.7%) 432 (97.7%) 0.374Myc protein 440 (60.9%) 17 (60.7%) 413 (61.7%) 1.000Myc and BCL2 237 (33.0%) 8 (28.6%) 225 (33.7%) 0.685BCL2 rearrangement 79 (13.3%) 1 (5.0%) 76 (13.4%) 0.497BCL6 rearrangement 120 (25.2%) 1 (6.3%) 118 (26.2%) 0.083TP53 mutation 109 (22.0%) 2 (10.0%) 102 (22.6%) 0.271MDM2 aberration 3 (0.8%) 1 (7.1%) 2 (0.6%) 0.108MDM4 aberration 2 (0.5%) 1 (7.1%) 1 (0.3%) 0.073MYC rearrangement 40 (8.4%) 2 (11.1%) 38 (8.4%) 0.660MYC/BCL2 doublea 11 (1.8%) 0 (0%) 11 (1.9%) 1.000

NOTE: Cutoff for each protein biomarker can be found out in Materials and Methods.aBoth MYC and BCL2 are rearranged.

Table 3. Multivariate analysis of clinicopathologic parameters in 732 cases of de novo DLBCL treated withR-CHOP regimen

OS PFS

HR 95% CI P HR 95% CI P

Age >60 1.697 1.090–2.642 0.019 1.525 0.934–2.491 0.092Gender 0.848 0.596–1.206 0.358 0.975 0.670–1.418 0.894B symptoms 1.116 0.771–1.615 0.561 1.193 0.802–1.774 0.385ECOG �2 1.936 1.244–3.012 0.003 1.738 1.073–2.816 0.025Stage III or IV 2.757 1.615–4.708

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Figure 2. Impact of CD30 expression and EBV infection on OS and PFS of patients with DLBCL. A and B, compared with patients with EBER�CD30�DLBCL,patients with EBERþ CD30� did not have significantly different OS (P ¼ 0.560) and PFS (P ¼ 0.343). C and D, coexpression of EBER and CD30 inDLBCL showed worse OS (P ¼ 0.014) compared with patients with EBER� CD30� DLBCL. However, PFS was not significantly different (P ¼ 0.257)between the two groups. E and F, worse outcome was observed in patients with EBERþ CD30þ DLBCL compared with EBERþ CD30� DLBCL in OS(P¼ 0.042), but not in PFS (P¼0.145). G andH, patientswith EBERþCD30þDLBCLhave significantlyworseOSandPFScomparedwith patientswith EBER�CD30þ DLBCL (P < 0.001 and P ¼ 0.001, respectively).

Ok et al.





molybdenum cofactor, essential for the enzyme activity ofaldehyde oxidase. Because aldehyde oxidase is a majorenzyme involved in drugmetabolism and clearance, down-regulation of MOCOS could be a possible mechanism ofchemotherapeutic resistance (18). EYA4 is a gene involvedin DNA repair and EYA4 downregulation has been associ-ated with poor clinical outcome in patients with non-Hodgkin lymphoma (19).We further conducted GEP in EBERþ/CD30þDLBCL and

EBERþ/CD30� DLBCL. A total of 68 genes were differen-tially expressed between the two groups (Fig. 3B). Among44 upregulated genes in EBERþ/CD30þ DLBCL, NME5 hasan antiapoptotic effect, C10orf46 promotes cell prolifera-tion, and ZC4H2 induces cell-cycle progression. Among 14genes downregulated in EBERþ/CD30þ DLBCL, RSF1,PTPN6, and OSBP were conspicuous. Downregulation ofRSF1, which normally represses the NF-kB pathway, mightcontribute to NF-kB activation. PTPN6 andOSBP normallydephosphorylate substrates, and downregulation of thesegenes could enhance a variety of signal transductionpathways.

We used KEGG gene sets for GSEA. The Toll-like receptorand RIG-1–like receptor signaling pathways were signifi-cantly enriched in EBVþ DLBCL (Fig. 3C). These pathwayscan activate theNF-kBpathway, providing indirect evidenceof enhanced NF-kB activity in EBVþDLBCL. The GSEA alsodemonstrated enrichment of the JAK/STAT signaling path-way, compatible with enhanced expression of pSTAT3 inEBVþ DLBCL (Fig. 3D). This finding suggests that STAT3might be activated by EBV, similar to STAT3 activation byLMP1 in nasopharyngeal carcinoma (20).

DiscussionIna cohort of732patientswithde novoDLBCL treatedwith

R-CHOP, the prevalence of EBV was 4.0%. A prior reportfromKorea showed that EBER expression (cutoff�20%)wasassociated with >60 years, advanced Ann Arbor stage, �2extranodal site involvement, high intermediate/high inter-national prognostic index, and B symptoms (5). In thepresent study, however, unique clinical characteristics werenot found in EBVþ DLBCLs. Considering the fact that priorstudies were mostly studied on Asian patients with EBVþ de

MIR17HGA B

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P4HB

ENTPD6EBV status Negative Positive

VMO1

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ZC4H2ABHD1

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C9orf80

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OSBP

EBER+ CD30+ EBER+ CD30–

Enrichment plot:KEGG_TOLL_LIKE_RECEPTOR_SIGNALING_PATHWAY

Enrichment plot:KEGG_JAK_STAT_SIGNALING_PATHWAY

0.400.350.300.25

0.25

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–0.25

–0.500 2,500 5,000

Enrichment profile Hits Ranking metric scores Enrichment profile Hits Ranking metric scores

7,500 10,000Rank in ordered dataset Rank in ordered dataset

12,500 15,000 17,500 20,000 0 2,500 5,000 7,500 10,000 12,500 15,000 17,500 20,000

0.200.150.100.050.00

Enr

ichm

ent s

core

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0.400.350.300.25

0.25

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0.200.150.100.050.00

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Figure 3. GEP and GSEA in EBVþ DLBCL. A, a unique gene expression signature was found in EBVþ DLBCL compared with EBV� DLBCL. B, DLBCLs withcoexpression of EBER andCD30 showed a gene expression signature distinct from cases with EBERþCD30�. C andD, GSEA validated enhanced activity ofthe NF-kB pathway and the JAK/STAT pathway in EBVþ DLBCL.






novoDLBCL and our study group is composed of Caucasianpatients, the difference between prior data and oursmight berelated to different characteristics of host factors and ethnicbackground. For example, polymorphisms in chemokine orcytokines such as CCR5-D32, CCR2-64I, SDF1-30A, IL4-589T, and IL10-50592Aare observedwithdifferent frequencybetween European Caucasians and East Asians (21–23). Inaddition, different allele frequency in HLA molecules mightexplain the different clinical manifestations in EBVþ DLBCLcompared with Asian patients. Interestingly, one studyshowed that CCR5-D32 polymorphism, which is found in5% to 15%ofCaucasians but not seen in Asians, reduced therisk of DLBCL and follicular lymphoma in Caucasian men,partly explaining the different prevalence of EBVþ DLBCL indeveloped Western countries (24).

Similar to the host factors, geographic variation of EBVstrainsmight also contribute to the different prevalence andclinical behavior of EBVþ DLBCL. Frequency of type I andtype II EBV, based on genetic polymorphisms in EBNA2 andEBNA3 genes, is different according to geographic region(25). Genome sequencing of three different EBV strains(B95-8, GD1, and AG876) showed that LMP1 sequence inGD1 (in aChinese patientwith nasopharyngeal carcinoma)was markedly different from that in B95-8 (a North Amer-ican patient with infectious mononucleosis) and AG876 (aWestern African patient with Burkitt lymphoma), suggest-ing that tumorigenic potential of LMP1 might be differentbased on geographic location (26). In addition, polymor-phism in theBamHI F region in the EBV genome, "f" variant,is more frequently observed in patients with nasopharyn-geal carcinoma in Southern China compared with patientsin North America (27). One study showed that nasopha-ryngeal carcinoma with "f" variant demonstrated morefrequent expression of phosphorylated STAT3, p53, BCL2,and higher Ki-67 proliferation rate compared with the Fprototype, suggesting that genetic variation in EBV genomecan contribute to the aggressiveness of tumor (28). Takentogether, different genetic variation in the EBV genome isseen in the different geographic regions and might explaindifferences in thedifferent behavior of thedisease. Althoughdistinct clinical features were not observed, interestingpathologic and molecular features were observed in EBVþ

DLBCL. Our data showed slightly higher frequency of theGCB type (39.3%) in EBVþ DLBCL compared with priordata (22%–32%; refs. 5, 8, 9, 11). Unlike others who usedHans or Choi algorithm for determining cell-of-origin, weusedGEP as gold standardwith immunohistochemistry as acomplementary method. Of note, the Hans and Choi algo-rithms have reported 71% and 88% concordance and 96%and 89% concordance with GCB and ABC by GEP classi-fication of DLBCL, respectively (16, 29).

Compared with previous data, LMP1 expression in EBVþ

DLBCL was low (66.7%, n ¼ 8) in our study. Six casesshowed EBER expression in �30% tumor cells, suggestingthat EBERþ cells are unlikely to be reactive cells. Of theremaining 2 patients with EBER expression

of pSTAT3 might potentiate activity of canonical NF-kB inEBVþDLBCL, although its expression did not show statisticsignificant correlation with NF-kB p50.GEP showed that EBVþ DLBCL is distinct from EBV�

DLBCL at the molecular level. Distinctly upregulated genesin EBVþDLBCL are involved in enhanced activity of NF-kB,cell proliferation, cell-cycle progression, and cell metabo-lism. Meanwhile, downregulated genes suggest possiblechemotherapeutic resistance, poor prognosis, and EBV-associated CD30 expression. By GSEA, immunohistochem-ical evidence of activated NF-kB pathway was reproduced.Gene set enrichment of the JAK/STAT pathway, in tandemwith significant overexpression of pSTAT3 in EBVþ DLBCLmight provide a rationale for new therapeutic options.Contrary to most previous reports, we showed that EBER

positivity does not predict poorer survival in patients withDLBCL in developed countries irrespective of COO stratifi-cation and entire cohort. Because all cases in our cohortexpressedCD20,we cannot entirely exclude apossibility thatanti-CD20 agent overcomes inferior outcome observed inthe CHOP era, because we did not have a well-selectedcohort treated with CHOP for comparison. No large reliablecohort study has been performed in the Western countriesfor EBVþ de novo DLBCL patients treated with the CHOPregimen that could be used for comparison. Theoretically,because all EBERþ and EBER� DLBCL cells express CD20with similar intensity, we believe that rituximab should excelits anti-lymphoma functions more or less similarly in boththe EBERþ and EBER� DLBCL patients. Our results are inaccordance with a few reports that EBVþ DLBCL did notdemonstrate poor outcome (4, 38, 39). Despite such ahypothesis, rituximabhas shown its variable anti-lymphomafunctions in individual patients due to the heterogeneity oftumor cells or pathologic biology related to the genomic andepigenetic status within the tumor cells, including variableCD20 antigen expression intensity, antibody-dependentcell-mediated cytotoxicity efficacy, microenvironment regu-latory role, chemokine and cytokine expression, B-cell recep-tor signaling inhibition, CD30 activation and death signal-ing pathway regulation, and EBV-specific microRNA expres-sion. In fact, coexpression of CD30 and EBER in DLBCLshowed a worse outcome. This result suggests that (i) pre-viously reported worse outcome in EBVþ DLBCLs could beassociated with coexpression of CD30 and EBER, not justsingle expressionof EBER, and (ii) theremight be geographicdifferences in EBV strains so that prognostic effects might bevariable. We therefore recommend CD30 assessment beincluded in a daily diagnostic practice daily diagnostic prac-tice for any patient with EBVþ lymphoma.We further showed by using GEP that EBERþ CD30þ

DLBCL is a unique subgroup of EBVþ DLBCL. Comparedwith EBERþ/CD30� DLBCL, DLBCL with coexpression ofEBER and CD30 was characterized by increased activity ofthe NF-kB pathway, cell proliferation, and cell-cycle pro-gression. Unique features of GEP in EBERþ/CD30þ DLBCLsuggest the need for a larger study focusing on a directcomparison of CD30 expression among patients with EBVþ

DLBCLs.

Our findings also suggest a rationale for targeted therapyfor patients with EBVþ DLBCL. Brentuximab vedotin is aCD30-specific antibody–drug conjugate. Although a recentreport of a clinical trial with brentuximab in patients withCD30þ DLBCL was not promising, the result of this trialmight not be applicable to EBVþ CD30þ DLBCL, as only 2patients were EBERþ (40). Our study suggests that morespecifically selected patients are needed for a clinical trialwith brentuximab. We also showed enhanced NF-kB activ-ity in EBVþ DLBCL, even in the GCB type. Therefore,inhibitors of theNF-kB pathwaywould be good therapeuticoptions for these patients irrespective of COO. A phase I/IIclinical trial with bortezomib plus R-CHOP in patients withDLBCL negated the adverse outcome of non-GCB subtypeand showed similar survival rates in patients with GCBversus non-GCB subtype (41). Another NF-kB pathwayinhibitor, MLN4924, was shown to induce apoptosis andtumor regression in ABC DLBCL cell lines and xenograftmodels (42). Currently, a clinical trial is under way withMLN4924 in patients with DLBCL (NCT01415765).NEMO-binding domain peptide has also been shown toinhibit NF-kB target gene expression and reduce tumorburden in an in vivo mouse model (43). In addition, inparallel with NF-kB inhibition, targeting or cotargeting theJAK/STAT pathwaymight be an attractive strategy. As shownby Lam and colleagues, a JAK inhibitor in combinationwithan inhibitor of IkBkinase (IKK) inhibitor killedABCDLBCLcell lines more potently (44).

Two morphologic variants of EBVþ DLBCL, monomor-phic and polymorphic, have been recognized. Montes-Moreno and colleagues have subdivided the polymorphicsubtype into three groups based on the relative proportionof large neoplastic cells and Hodgkin Reed-Sternberg–likecells: (i) canonical large B-cell neoplasm, (ii) DLBCL withHodgkin lymphoma–like features, and (iii) DLBCL withpolymorphic lymphoproliferative disorder–like features(9). Although elucidation of these morphologic variants isof value to pathologists to facilitate recognition of EBVþ

DLBCLs, in this study these morphologic variants did nothave prognostic relevance.

Our study has shown that EBVþ DLBCL is a geneticallyunique subset with increased canonical NF-kB and JAK/STAT pathway activation, but EBV infection itself does notpredict inferior outcome in Western developed countries ifCD30 is not expressed. This is the first comprehensive studyin this uniquely classified groupof lymphomapatients fromWestern countries, providing a strong rationale of targetedtherapy on the CD30 activation pathway for this subset ofpatients with DLBCL.

Disclosure of Potential Conflicts of InterestA. Orazi is a consultant/advisory board member for Incyte Corporation.

C.E. Bueso-Ramos has received speakers bureau honoraria from Novartis.No potential conflicts of interest were disclosed by the other authors.

Authors' ContributionsConception and design: C.Y. Ok, K.H. YoungDevelopment of methodology: C.Y. Ok, Z.Y. Xu-Monette, K.H. YoungAcquisitionofdata (provided animals, acquired andmanagedpatients,provided facilities, etc.):C.Y. Ok, Z.Y. Xu-Monette, C. Visco, A. Tzankov, S.






Montes-Moreno, K. Dybkær, A. Chiu, A. Orazi, Y. Zu, G. Bhagat, J. Chen, K.L.Richards, E.D.Hsi,W.W.L. Choi, J.H. vanKrieken, J. Huh,W. Ai,M. Ponzoni,A.J.M. Ferreri, J.P. Farnen, M.B. M�ller, J.N. Winter, M.A. Piris, K.H. YoungAnalysis and interpretation of data (e.g., statistical analysis, biosta-tistics, computational analysis): C.Y. Ok, L. Li, Z.Y. Xu-Monette, C. Visco,G.C. Manyam, J. Chen, W.W.L. Choi, J. Huh, M.B. M�ller, K.H. YoungWriting, review, and/or revision of the manuscript: C.Y. Ok, Z.Y. Xu-Monette, C. Visco, A. Tzankov, G.C. Manyam, K. Dybkær, A. Chiu, A. Orazi,G. Bhagat, J. Chen, K.L. Richards, E.D.Hsi, J.H. van Krieken, J. Huh,W. Ai,M.Ponzoni, A.J.M. Ferreri, M.B. M�ller, C.E. Bueso-Ramos, R.N. Miranda, J.N.Winter, M.A. Piris, L.J. Medeiros, K.H. YoungAdministrative, technical, or material support (i.e., reporting or orga-nizing data, constructing databases): L. Li, Z.Y. Xu-Monette, A. Chiu, G.Bhagat, J. Chen, W.W.L. Choi, J. Huh, M.B. M�ller, C.E. Bueso-Ramos, L.J.Medeiros, K.H. YoungStudy supervision: C. Visco, K.H. Young

Grant SupportThis work was supported by the Hematopathology Fellowship Award (to

C.Y. Ok), Hematology/Oncology Scholarship Award (to L. Li), Harold C.

and Mary L. Daily Endowment Fellowships and Shannon Timmins Fel-lowship for Leukemia Research Award (to Z.Y. Xu-Monette), the ZurichStiftung zur Krebsbekaempfung (to A. Tzankov), The University of TexasMD Anderson Cancer Center Institutional Research Grant Award, anMD Anderson Lymphoma Specialized Programs of Research Excellence(SPORE) Research Development Program Award, an MD Anderson Mye-loma SPORE Research Development Program Award, and MD AndersonCollaborative Research Funds with High-Throughput Molecular Diagnos-tics, Daiichi Sankyo, and Roche Molecular Systems (to K.H. Young).This work was also partially supported by National Cancer Instituteand NIH grants (R01CA138688, 1RC1CA146299, P50CA136411, andP50CA142509), and by the MD Anderson Cancer Center Support GrantCA016672.

The costs of publication of this article were defrayed in part by thepayment of page charges. This article must therefore be hereby markedadvertisement in accordance with 18 U.S.C. Section 1734 solely to indicatethis fact.

ReceivedNovember 19, 2013; revised January 21, 2014; accepted February2, 2014; published OnlineFirst February 28, 2014.

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Correction

Correction: Prevalence and Clinical ImplicationsofEpstein–BarrVirus Infection inDeNovoDiffuseLarge B-Cell Lymphoma in Western Countries

In this article (Clin Cancer Res 2014;20:2338–49), which was published in theMay 1, 2014, issue of Clinical Cancer Research (1), the name of one author wasmisprinted. The corrected name should read as follows: "Karen Dybkær." Thepublisher regrets this error.

Reference1. Ok CY, Li L, Xu-Monette ZY, Visco C, Tzankov A, Manyam GC, et al. Prevalence and clinical

implications of Epstein–Barr virus infection in de novo diffuse large B-cell lymphoma in Westerncountries. Clin Cancer Res 2014;20:2338–49.

Published online September 15, 2014.doi: 10.1158/1078-0432.CCR-14-1858�2014 American Association for Cancer Research.

ClinicalCancer

Research

Clin Cancer Res; 20(18) September 15, 20144974

2014;20:2338-2349. Published OnlineFirst February 28, 2014.Clin Cancer Res Chi Young Ok, Ling Li, Zijun Y. Xu-Monette, et al.

Diffuse Large B-Cell Lymphoma in Western CountriesDe Novoin Barr Virus Infection−Prevalence and Clinical Implications of Epstein

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