Genomic alterations and gene expression in primary diffuse large B-cell lymphomas of immune-privileged sites: the importance of apoptosis and immunomodulatory pathways

The Journal of Pathology
Marije BoomanPm Kluin

Abstract

Primary diffuse large B-cell lymphomas of different immune-privileged sites (IP-DLBCLs) share many clinical and biological features, such as a relatively poor prognosis, preferential dissemination to other immune-privileged sites, and deletion of the HLA region, which suggests that IP-DLBCL represents a separate entity. To further investigate the nature of IP-DLBCL, we investigated site-specific genomic aberrations in 16 testicular, nine central nervous system (CNS), and 15 nodal DLBCLs using array CGH. We also determined minimal common regions of gain and loss. Using robust algorithms including multiple testing procedures and the ACE-it script, which is specifically designed for this task, the array CGH data were combined with gene expression data to explore pathways deregulated by chromosomal aberrations. Loss of 6p21.32-p25.3, including the HLA genes, was associated with both types of IP-DLBCL, whereas gain of 2p16.1-p25.3 was associated with nodal DLBCL. Gain of 12q15-q21.1 and 12q24.32-q24.33 was associated with CNS DLBCL and gain of 19q13.12-q13.43 with testicular DLBCL. Analysis of candidate genes in site-specific regions and minimal common regions revealed two major groups of genes: one involved in the immune response, ...Continue Reading

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