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Ena-DATASET-BCI-11-12-2012-11:04:37:107-8 - samples

ABSTRACT: Whole genome sequencing analysis was performed on 6 patients within matched germline, follicular lymphoma and transformed follicular lymphoma.

PROVIDER: EGAD00001000292 | EGA |

REPOSITORIES: EGA

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Genome-wide copy number analyses reveal genomic abnormalities involved in transformation of follicular lymphoma

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Project description:Follicular lymphoma (FL) is the second most common B-cell malignancy representing one quarter of Non-Hodgkin's Lymphomas. Although the disease has a relatively long median survival, the illness follows a fluctuating course of progression punctuated by remissions of variable duration. For as many as half of patients, transformation to a more aggressive lymphoma (t-FL) may occur; this event is often associated with a particularly poor response to treatment. SNP analysis has revealed the presence of large regions of homozygosity in the absence of copy number change. These events can result in the selection of of daughter cells made homozygous for a pre-existing mutation. We have used SNPs array technology to investigate regions of loss of hetrozygosity in the absence of copy number change in order to establish the contribution of these abnormalities to the evolution of FL and t-FL. Experiment Overall Design: DNA from 26 pairs of follicular and transformed follicular lymphoma samples and 3 cell lines were analysed using Affymetrix 10K SNP arrays. The genotype data of transformed follicular lymphoma samples were compared with the data from the corresponding follicular lymphoma sample.

2008-06-17 | E-GEOD-7425 | biostudies-arrayexpress

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Project description:Affymetrix SNP array data for follicular lymphoma (FL) and transformed follicular lymphoma (tFL) samples

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Gene expression profiling in follicular lymphoma (FL) samples and paired transformed follicular lymphoma (tFL) (n=6 samples)

Project description:Follicular lymphoma (FL) is the second most common forms of B cell lymphoma that result from the expansion of germinal center (GC) B cells. Here, we aimed to find differential expression of genes between patient samples isolated from indoent FL or transformed and aggressive FL.

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Transcription profiling of follicular lymphoma to diffuse large cell lymphoma

Project description:Transformation of Follicular Lymphoma to Diffuse Large Cell Lymphoma: Alternative Patterns with Increased or Decreased Expression of c-myc and its Regulated genes The natural history of follicular lymphoma (FL) is frequently characterized by transformation to a more aggressive diffuse large B cell lymphoma (DLBCL). We compared the gene expression profiles between transformed DLBCL and their antecedent FL. No genes were observed to increase or decrease their expression in all the cases of histological transformation. However, two different gene expression profiles associated with the transformation process were defined, one in which c-myc and genes regulated by c-myc showed increased expression and one in which these same genes showed decreased expression. Further, there was a striking difference in gene expression profiles between transformed DLBCL and de novo DLBCL, since the gene expression profile of transformed DLBCL was more similar to their antecedent FL than to de novo DLBCL. The study demonstrates that transformation from FL to DLBCL can occur by alternative pathways and that transformed DLBCL and de novo DLBCL have very different gene expression profiles that may underlie the different clinical behaviors of these two types of morphologically similar lymphomas.

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