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Chronic lymphocytic leukemia (CLL) is the most common leukemia in the Western world and remains incurable with conventional chemotherapy treatment approaches. CLL as a disease entity is defined by a relatively parsimonious set of diagnostic criteria and therefore likely constitutes an umbrella term for multiple related illnesses. Of the enduring fundamental biological processes that affect the biology and clinical behavior of CLL, few are as central to the pathogenesis of CLL as recurrent acquired genomic copy number aberrations (aCNA) and recurrent gene mutations. Here, a state-of-the-art overview of the pathological anatomy of the CLL genome is presented, including detailed descriptions of the anatomy of aCNA and gene mutations. Data from SNP array profiling and large-scale sequencing of large CLL cohorts, as well as stimulated karyotyping, are discussed. This review is organized by discussions of the anatomy, underlying pathomechanisms and clinical significance of individual genomic lesions and recurrent gene mutations. Finally, gaps in knowledge regarding the biological and clinical effects of recurrent genomic aberrations or gene mutations on CLL are outlined to provide critical stimuli for future research.

The biology and clinical significance of acquired genomic copy number aberrations and recurrent gene mutations in chronic lymphocytic leukemia