1 Genome-wide profiling of follicular lymphoma by array comparative genomic hybridization reveals prognostically significant DNA copy number imbalances K-John J Cheung, 1 Sohrab P Shah, 2 Christian Steidl, 1 Nathalie Johnson 1 , Thomas Relander, 1 Adele Telenius, 1 Betty Lai, 1 Kevin P Murphy, 2 Wan Lam, 3 Abdulwahab J Al- Tourah, 1 Joseph M Connors, 1 Raymond T Ng, 2 Randy D Gascoyne, 1 and Douglas E Horsman. 1 1 Center for Lymphoid Cancer, British Columbia Cancer Agency; 2 Department of Computer Science, University of British Columbia; 3 Cancer Genetics and Developmental Biology, British Columbia Cancer Research Center, Vancouver, BC. K.J.C and S.P.S. contributed equally to this study Correspondence: Dr. Doug Horsman, Center for Lymphoid Cancer, British Columbia Cancer Agency, 600 West 10 th Avenue, Vancouver, British Columbia V5Z 4E6; Phone: 604.877.6000 ext 2095; Fax: 604.877.6178; E-mail: [email protected]Word counts: Abstract-188; Text-4994 Scientific category: Neoplasia Running title: Genomic profiling of follicular lymphoma Key words: Array comparative genomic hybridization, follicular lymphoma, hidden markov model, cluster analysis, overall survival, transformation risk, Kaplan-Meier analysis, Cox proportional-hazards model Abbreviations: Array CGH, Array comparative genomic hybridization; Copy-neutral LOH, copy-neutral loss of heterozygosity; FISH, fluorescence in situ hybridization; CNVs, copy number variants; FL, follicular lymphoma; DLBCL, diffuse large B-cell lymphoma; MCL, mantle cell lymphoma; HMM, hidden markov model; ROC, receiver operator characteristic; TPR, true positive rate; FPR, false positive rate; AUC, area under the ROC curve; BCCA, British Columbia Cancer Agency. The online version of the article contains a data supplement
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Genome-wide profiling of follicular lymphoma by array comparative genomic hybridization reveals prognostically significant DNA copy number imbalances K-John J Cheung,1 Sohrab P Shah,2 Christian Steidl,1 Nathalie Johnson1, Thomas Relander,1 Adele Telenius,1 Betty Lai,1 Kevin P Murphy,2 Wan Lam,3 Abdulwahab J Al-Tourah,1 Joseph M Connors,1 Raymond T Ng,2 Randy D Gascoyne,1 and Douglas E Horsman.1 1Center for Lymphoid Cancer, British Columbia Cancer Agency; 2Department of Computer Science, University of British Columbia; 3Cancer Genetics and Developmental Biology, British Columbia Cancer Research Center, Vancouver, BC. K.J.C and S.P.S. contributed equally to this study Correspondence: Dr. Doug Horsman, Center for Lymphoid Cancer, British Columbia Cancer Agency, 600 West 10th Avenue, Vancouver, British Columbia V5Z 4E6; Phone: 604.877.6000 ext 2095; Fax: 604.877.6178; E-mail: [email protected]
Word counts: Abstract-188; Text-4994 Scientific category: Neoplasia Running title: Genomic profiling of follicular lymphoma Key words: Array comparative genomic hybridization, follicular lymphoma, hidden markov model, cluster analysis, overall survival, transformation risk, Kaplan-Meier analysis, Cox proportional-hazards model Abbreviations: Array CGH, Array comparative genomic hybridization; Copy-neutral LOH, copy-neutral loss of heterozygosity; FISH, fluorescence in situ hybridization; CNVs, copy number variants; FL, follicular lymphoma; DLBCL, diffuse large B-cell lymphoma; MCL, mantle cell lymphoma; HMM, hidden markov model; ROC, receiver operator characteristic; TPR, true positive rate; FPR, false positive rate; AUC, area under the ROC curve; BCCA, British Columbia Cancer Agency.
The online version of the article contains a data supplement
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Abstract
The secondary genetic events associated with follicular lymphoma (FL) progression are
not well defined. We applied genome-wide BAC array comparative genomic
hybridization to 106 diagnostic biopsies of FL to characterize regional genomic
imbalances. Using an analytical approach that defined regions of copy number change
as intersections between visual annotations and a Hidden Markov model-based
algorithm, we identified 71 regional alterations that were recurrent in ≥10% of cases.
These ranged in size from ~200 kb to 44 Mb, affecting chromosomes 1, 5, 6, 7, 8, 10,
12, 17, 18, 19, and 22. We also demonstrated by cluster analysis that 46.2% of the 106
cases could be sub-grouped based on the presence of +1q, +6p/6q-, +7 or +18.
Survival analysis showed that 21 of the 71 regions correlated significantly with inferior
overall survival (OS). Of these 21 regions, 16 were independent predictors of OS using
a multivariate Cox model that included the International Prognostic Index (IPI) Score.
Two of these 16 regions (1p36.22-p36.33 and 6q21-q24.3) were also predictors of
transformation risk and independent of IPI. These prognostic features may be useful to
identify high-risk patients as candidates for risk-adapted therapies.
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Introduction
Lymphoid malignancies account for ~5% of cases of cancer in the U.S. and have
continued to rise in frequency at 3-4% annually.1, 2 Of the different types of indolent
lymphoma, follicular lymphoma (FL) ismostprevalent andhas a variable clinical course
with a median survival of 10 years.3 While management strategies have changed,
advanced‐stage FL remains an incurable disease using conventional therapies.4
Approximately 85% of FL is associated with a specific balanced translocation,
information related to transformation. J.M.C., R.D.G. and D.E.H were directly or
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indirectly involved in the selection and procurement of clinical specimens, conceived the
study, and involved in the writing of the manuscript. All authors agreed on the final
version of the manuscript.
Conflict of interest disclosure: The authors declare no competing financial interests.
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Table legends
Table 1. Patient characteristics of 106 FL specimens acquired at diagnosis
Clinical characteristics
n=106 (%)
Log rank p value for survival
Log rank p value for
transformation Median Age, years Male sex Age>60 PS > 1 LDH > normal Extranodal sites > 1 Stage III/IV IPI score: 0-1 2-3 4-5 Diagnostic Pathology: FOLL1 FOLL2 FOLL3A Primary therapy: Observation Rad alone Single agent chemo Multi-agent chemo +/- rad Multi-agent chemo + rituximab Outcome: Transformation: Biopsy proven Clinical Death: Unrelated From transformation From progressive indolent FL Median follow up alive = 7.33 years Median overall survival = 10.83 years Median time to transformation = 6.61 years