David W. Hammond

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Posterior uveal melanomas have nonrandom alterations affecting chromosomes 3, 6, and 8. Loss of chromosome 3 in uveal melanoma has been shown to act as a predictor of disease-free and overall survival. To confirm the significance of chromosome 3 loss and to extend the observations to include those of the associated alterations of chromosome 8, we have(More)
The purpose of this study was to identify novel areas of genomic copy number change associated with transformation from follicular lymphoma (FL) to diffuse large B cell lymphoma (DLBL). DNA was extracted from tumour cells micro-dissected from paraffin- embedded tissue sections in 24 patients with FL and subsequent transformation to DLBL and 18 patients with(More)
The atypical teratoid/rhabdoid tumour (AT/RT) is an uncommon tumour of the central nervous system in children, characterized by the presence of a rhabdoid cell component associated with variable combinations of primitive neuroectodermal tumour, mesenchymal and epithelial differentiation. Immunohistochemistry reveals a complex pattern of antigen expression(More)
Transformation of the indolent follicular lymphoma (FL) to the aggressive diffuse large B-cell lymphoma (DLBCL) results in resistance to therapy with shortened survival. It has been demonstrated that the 12q12-14 region was mainly amplified in DLBCL cases but not in their FL counterparts. Therefore, we examined the DNA copy number and protein expression(More)
We have carried out comparative genomic hybridization (CGH) analysis on archival biopsy material from a series of 30 UK mantle cell lymphomas. The most frequent aberrations were gains of 3q (21 cases), 6p (19 cases), 7q (8 cases), 12p (8 cases), 12q (9 cases) and 17q11q21 (8 cases), and losses of 1p13p32 (10 cases), 5p13p15.3 (9 cases), 6q14q27 (11 cases),(More)
This investigation aimed to identify patterns of copy number change in colorectal tumor progression from adenoma to liver metastasis. Fifty-three microdissected sub-regions from 17 cases of colorectal cancer were assigned to one of six histopathologically defined categories: coexisting adenoma, tumor above the muscularis layer, tumor within the muscularis(More)
In a study of abnormal chromosomes in non-Hodgkin's lymphoma (NHL) cells we have identified one case which contained extrachromosomal chromatin bodies that, on the basis of their morphology and negative C-banding, appeared to be double minute chromosomes (dmin). However, fluorescence in-situ hybridization (FISH) analysis using an X-specific centromeric(More)
Ideopathic myelofibrosis (IMF) is a chronic myeloproliferative disorder resulting in bone marrow fibrosis as a consequence of growth factor release from clonal haematopoiesis. Conventional cytogenetic analysis identifies abnormalities in approximately a third of cases at diagnosis, although rarely uncovers unique, primary genetic events. We have used(More)
It has recently been reported that additional X chromosomes occur in over 30% of B-cell non-Hodgkin's lymphomas (NHL), and that monosomy of the X chromosome occurs in 38% of female patients with T-cell leukaemia or lymphoma. These observations have suggested a possible role for the X chromosome in the evolution of NHL. We have now examined 280 cases of NHL,(More)
The etiology of Hodgkin lymphoma (HL) is poorly understood, and studies of the genetics of this disease have been hampered by the scarcity of the Hodgkin and Reed-Sternberg (HRS) cells within tumors. To determine whether recurrent genomic imbalances are a feature of HL, CD30-positive HRS cells were laser-microdissected from 20 classical Hodgkin lymphomas(More)