4913 results for "*oma"

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• scRNA-seq of LN and lymphoma stroma

  The activities of non-haematopoietic cells (NHCs), including mesenchymal stromal cells and endothelial cells, in lymphomas, reportedly underlie lymphomagenesis. However, understanding of lymphoma NHCs has been hampered by unexplained NHC heterogeneity, even in normal human lymph nodes (LNs). Here, we constructed a single-cell transcriptome atlas of >100,000 NHCs collected from 27 human samples, including LNs and various nodal lymphomas, revealing 30 distinct subclusters, including some that were previously unrecognized. Notably, this atlas was highly useful for comparative analysis with lymphoma NHCs, which revealed an unanticipated landscape of subcluster-specific changes in gene expression and interaction with malignant cells in follicular lymphoma NHCs, facilitating our understanding of stromal remodelling in lymphoma and potentially suggesting novel biomarkers. Our study largely updates NHC taxonomy in human LNs and pertains to analysis of disease status, providing a rich resource and deeper insights into LN and lymphoma biology and offering to advance lymphoma management and therapy.

  Study EGAS00001005732

• A conserved enhancer in ecDNA-containing Medulloblastoma

  Extrachromosomal DNA (ecDNA) fundamentally reshapes the regulatory landscape of cancer cells by providing a platform for massive oncogene amplification and heightened chromatin accessibility. This research investigates how ecDNA-resident enhancers operate within large-scale molecular hubs to drive potent, long-range transcriptional activation that transcends standard chromosomal boundaries. By analyzing the unique structural configurations of these elements, the work identifies key mechanisms that contribute to rapid tumor evolution and significant phenotypic plasticity. These findings highlight the critical role of non-chromosomal regulatory elements in maintaining oncogenic signaling and suggest new avenues for therapeutic intervention in aggressive, ecDNA-driven malignancies.

  Study EGAS50000001609

• A conserved enhancer in ecDNA-containing Medulloblastoma

  Extrachromosomal DNA (ecDNA) fundamentally reshapes the regulatory landscape of cancer cells by providing a platform for massive oncogene amplification and heightened chromatin accessibility. This research investigates how ecDNA-resident enhancers operate within large-scale molecular hubs to drive potent, long-range transcriptional activation that transcends standard chromosomal boundaries. By analyzing the unique structural configurations of these elements, the work identifies key mechanisms that contribute to rapid tumor evolution and significant phenotypic plasticity. These findings highlight the critical role of non-chromosomal regulatory elements in maintaining oncogenic signaling and suggest new avenues for therapeutic intervention in aggressive, ecDNA-driven malignancies.

  Study EGAS50000001608

• A conserved enhancer in ecDNA-containing Medulloblastoma

  Extrachromosomal DNA (ecDNA) fundamentally reshapes the regulatory landscape of cancer cells by providing a platform for massive oncogene amplification and heightened chromatin accessibility. This research investigates how ecDNA-resident enhancers operate within large-scale molecular hubs to drive potent, long-range transcriptional activation that transcends standard chromosomal boundaries. By analyzing the unique structural configurations of these elements, the work identifies key mechanisms that contribute to rapid tumor evolution and significant phenotypic plasticity. These findings highlight the critical role of non-chromosomal regulatory elements in maintaining oncogenic signaling and suggest new avenues for therapeutic intervention in aggressive, ecDNA-driven malignancies.

  Study EGAS50000001610

• CUT&RUN in G3-MB

  Aligned BAM files from CCUT&RUN sequencing for BRD4 and H3K27ac in Group 3 Medulloblastoma cell models.

  Dataset EGAD50000002301

• G3-MB WGS

  Whole genome sequencing BAM files for four samples of MYC-amplified Group 3 medulloblastoma cell models.

  Dataset EGAD50000002302

• ChIP-seq for G3-MB

  ChIP-seq for H3K27ac and NeuroD1 in Group 3 Medulloblastoma cell models. Input DNA for each sample and target is also included.

  Dataset EGAD50000002303

• Identification of gene mutations and fusion genes in patients with Sézary Syndrome

  Sezary syndrome (SS) is a leukemic form of cutaneous T-cell lymphoma (CTCL) with an aggressive clinical course. The goal of our study is to understand the genetic basis of the disease by looking for driver gene mutations and fusion genes in 15 erythrodermic patients with circulating Sezary cels, fourteen of them fulfilling the diagnostic criteria of SS. Peripheral blood samples were collected for each patient and CD4+ T-lymphocytes and Granulocytes were isolated. DNA and RNA was extracted for matched normal and tumor materials. Whole exome sequencing was performed on matched normal and tumor tissues of 12 patients and RNA sequencing was performed on 10 patients. For 7 of these patients, we have both exome as well as RNA sequencing data. In this study, we present a complex genomic landscape of Sezary syndrome with several point mutations, copy number variations and fusion events which could contribute to the pathogenesis of SS.

  Study EGAS00001001706

• Prognostic relevance of microenvironmental factors CD163 and CD8 combined with EZH2 and chromosome 18 gain in a validation cohort of follicular lymphoma patients of the Lunenburg Lymphoma Biomarker Consortium

  Background: In follicular lymphoma (FL), studies addressing the prognostic value of microenvironment-related immunohistochemical (IHC) markers and tumor cell-related genetic markers have yielded conflicting results, precluding implementation in practice. Therefore, the Lunenburg Lymphoma Biomarker Consortium (LLBC) performed a validation study for published markers. Methods: To maximize sensitivity, an end-of-spectrum design was applied for 122 uniformly immunochemotherapy-treated FL patients retrieved from international trials and registries; early failure (EF): progression or lymphoma-related death <2 years versus long remission: response duration of >5 years. IHC staining for T-cells and macrophages was performed on tissue microarrays from initial biopsy and scored with a validated computer-assisted protocol. Shallow whole-genome and deep targeted sequencing was performed on the same samples. Results: 96/122 cases with complete molecular and immunohistochemical data were included in the analysis. EZH2 wild-type (p=0.006), gain of chromosome 18 (p=0.002), low percentages of CD8+ cells (p=0.011) and CD163+ areas (p=0.038) were associated with EF. No significant differences in other markers were observed, thereby refuting previous claims on their prognostic significance. Conclusion: Using an optimized study design, this LLBC study validates wild-type EZH2 status, gain of chromosome 18, low percentages of CD8+ cells and CD163+ area as predictors of EF to immunochemotherapy in FL.

  Study EGAS00001002049

• MutWP1__CRUK_Grand_Challenge_Mutographs_of_Cancer__clear_cell_renal_cell_carcinoma

  The Mutographs project aims to advance our understanding of the causes of cancer through studies of mutational signatures. Led by Mike Stratton, together with Paul Brennan, Ludmil Alexandrov, Allan Balmain, David Phillips and Peter Campbell, this large-scale international research endeavour was awarded a Cancer Research UK Grand Challenge. Different patterns of somatic mutation are generated by the different environmental, lifestyle and genetic factors that cause cancer, many of them are still unknown. Within Mutographs, the International Agency for Research on Cancer is coordinating the recruitment of 5000 individuals with cancer (colorectal, renal, pancreatic, oesophageal adenocarcinoma or oesophageal squamous cancers) across 5 continents to explore whether different mutational signatures explain marked variation in incidence. In brief, through an international network of collaborators around the world, biological materials are collected, along with demographic, histological, clinical and questionnaire data. Whole genome sequences of tumour-germline DNA pairs are generated at the Wellcome Trust Sanger Institute. Somatic mutational signatures are subsequently extracted by non-negative matrix factorisation methods and correlated with risk factors data. Through an enhanced understanding of cancer aetiology, Mutographs unprecedented effort is anticipated to outline modifiable risk factors, lead to new approaches to prevent cancer, and provide opportunities to empower early detection, refine high-risk groups and contribute to further therapeutic development.

  Study EGAS00001002608