Localisation of a novel region of recurrent amplification in follicular lymphoma to an ∼6.8 Mb region of 13q32‐33

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Abstract
Follicular lymphoma (FL) is characterised by the presence of the t(14;18)(q32;q21) and represents ∼25% of new cases of non-Hodgkin's lymphoma. While the t(14;18) is a well-documented rearrangement, the role of secondary cytogenetic abnormalities in the development and progression of these tumours remains unclear. Comparative genomic hybridisation was used to characterise changes in DNA copy number in tumour DNA from patients with this malignancy. The mean numbers of deletion and amplification events found in each of the 45 samples studied were 1.8 and 2.3, respectively. Regions of recurrent (>10% tumour samples) gain involved chromosomes 2p13-16 (16%), 7 (20%), 12 (16%), 13q21-33 (18%), 18 (27%), and X (36%) and frequent losses localised to 6q (29%) and 17p (20%). Amplification of chromosome 13 represents a novel finding in FL. The minimal amplified region was refined to a 6.8-Mb interval of 13q32-33 between the BAC clones 88K16 and 44H20 by fluorescence in situ hybridisation studies using metaphase chromosomes derived from tumour material. There are a number of reports in the literature suggesting that amplification of chromosome 13 also occurs in other human cancers. The location of the putative oncogene on 13q described here in follicular and transformed lymphoma may also be important in the evolution of many other malignancies.