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Prediction of response to bevacizumab

ABSTRACT: The patients who underwent surgery for primary lesions were examined. All patients had metastatic or recurrent CRC and received bevacizumab therapy as first line or second line treatment. Responders and nonresponders were determined based on RECIST and confirmed by CT or MRI. Gene-expression profiles of primary CRC were determined using Human Genome GeneChip arrays U133.

ORGANISM(S): Homo sapiens

PROVIDER: GSE19862 | GEO | 2013/01/03

SECONDARY ACCESSION(S): PRJNA121947

REPOSITORIES: GEO

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Prediction of response to bevacizumab

Project description:The patients who underwent surgery for primary lesions were examined. All patients had metastatic or recurrent CRC and received bevacizumab therapy as first line or second line treatment. Responders and nonresponders were determined based on RECIST and confirmed by CT or MRI. Gene-expression profiles of primary CRC were determined using Human Genome GeneChip arrays U133. Colorectal cancer patients who had undergone surgical resection of colorectal cancer were studied. To identify molecular signatures to predict response to bevacizumab, gene expression profiles were compared between Reponder and Non-responder.

2013-01-03 | E-GEOD-19862 | biostudies-arrayexpress

Prediction of response to FOLFOX

Project description:The patients who underwent surgery for primary lesions were examined. All patients had metastatic or recurrent CRC and received modified FOLFOX6. Responders and nonresponders were determined based on the best observed response at the end of the first-line treatment, mFOLFOX6. Gene-expression profiles of primary CRC were determined using Human Genome GeneChip arrays U133. Colorectal cancer patients who had undergone surgical resection of colorectal cancer were studied. To identify molecular signatures to predict response to mFOLFOX6 regimen, gene expression profiles were compared between Reponder and Non-responder. Some patients are overlapped with Bevacizumab therapy.

2013-01-03 | E-GEOD-19860 | biostudies-arrayexpress

Prediction of response to FOLFOX

2013-01-03 | GSE19860 | GEO

Immuno-priming with bevacizumab: durvalumab plus bevacizumab after prolonged exposition to bevacizumab in breast cancer

Project description:Purpose: To study the potential priming benefit of bevacizumab from subsequent immunotherapy (durvalumab) in advanced breast cancer patients Methods: We tested this hypothesis by adding durvalumab after progression to maintenance single-agent bevacizumab treatment in advanced HER2-negative patients (average 3 treatment lines). In order to study the potential priming benefit, patients had to experience disease progression while on bevacizumab maintenance prior to entering the trial. In addition, we sought to find traits in peripheral-blood mononuclear cells (PBMCs) and tumor biopsies that informed about this immuno-priming, in an attempt to search for novel biomarkers of efficacy of the combo and obtain a better understanding of the biology of this clinical scenario. Results: Patients that experienced clinical benefit, compared with the remaining patients, displayed a lymphocyte pattern in PBMCs consisting on increased T-effector subpopulations (CD4- and CD8- effector and effector-memory) and decreased immunosuppressive T-regulatory cells. Gene-expression studies in tumor samples showed a congruent pattern, with increased T-effector and memory T cell signatures in responders, and increased T-regulatory and decreased active dendritic cells in non-responders. These events were observed in patients that displayed vascular normalization features as a result of previous bevacizumab, supporting the immuno-priming effects of this strategy.

2020-10-15 | GSE139050 | GEO

Immuno-priming with bevacizumab: durvalumab plus bevacizumab after prolonged exposition to bevacizumab in breast cancer

Project description:Immuno-priming with bevacizumab: durvalumab plus bevacizumab after prolonged exposition to bevacizumab in breast cancer

| PRJNA578152 | ENA

Transcription profiling of human xenografts produced from an endometrial cell line treated with bevacizumab (Avastin)

Project description:Microarrays were used to determine the efficacy of bevacizumab (a monoclonal antibody against the vascular endothelial growth factor and its receptors.) on endometrial cancer cells. Endometrial cancer is the most frequent gynecologic cancer in women. Long term outcomes for patients with advanced stage or recurrent disease are poor. Targeted molecular therapy against the vascular endothelial growth factor (VEGF) and its receptors constitute a new therapeutic option for these patients. The goal of our work was to assess the potential effectiveness of inhibition of VEGF/VEGFR signaling in a xenograft model of endometrial cancer using bevacizumab (Avastin, a humanized antibody against VEGFA). We also aimed to identify molecular markers of sensitivity or resistance to this agent. We show that bevacizumab retards tumor growth in athymic mice by inhibiting molecular components of signaling pathways that sustain cell survival and proliferation. We also demonstrate that resistance to bevacizumab may involve up-regulation of antiapoptotic genes and certain proto-oncogenes. Experiment Overall Design: Human xenografts produced from endometrial cell line, grown in athymic mice, were treated in vivo with bevacizumab.

2009-11-16 | E-GEOD-18195 | biostudies-arrayexpress

TMT analysis of tissue proteomics in bevacizumab-resistant xenograft tumor tissuein nude mice

Project description:TMT proteomics was used to detect the difference in protein expression of bevacizumab-resistant xenograft tumor tissue in nude mice.

2022-10-13 | PXD030202 | Pride

Real-time quantitative PCR analysis of U87ΔEGFR intracranial mouse models treated with bevacizumab

Project description:The combination of bevacizumab with temozolomide and radiotherapy was shown to prolong progression-free survival in newly diagnosed glioblastoma patients, and this emphasizes the potential of bevacizumab as a glioma treatment. However, while bevacizumab effectively inhibits angiogenesis, it has also been reported to induce invasive proliferation. This study examined gene expression in glioma cells to investigate the mechanisms of bevacizumab-induced invasion. We made a human glioma U87ΔEGFR cell xenograft model by stereotactically injecting glioma cells into the brain of animals. We administered bevacizumab intraperitoneally three times per week. At 18 days after tumor implantation, the brains were removed for histopathology and mRNA was extracted. In vivo, bevacizumab treatment increased glioma cell invasion. qRT-PCR array analysis were perfomed.

2019-02-07 | GSE126168 | GEO

Sequencing in transcriptomes in Ovarian cancer cell line SKOV3 and bevacizumab-treated SKOV3

Project description:To investigate the possible mechanism of bevacizumab resistance in ovarian cancer ,we examined the changes in gene expression of SKOV3 before and after bevacizumab intervention. Results provide insight into molecular mechanisms of acquired resistance to bevacizumab in ovarian cancer.

2023-12-31 | GSE165419 | GEO

Patients With Proneural Glioblastoma May Derive Overall Survival Benefit From the Addition of Bevacizumab to First-Line Radiotherapy and Temozolomide: Retrospective Analysis of the AVAglio Trial

Project description:The AVAglio and RTOG-0825 randomized, placebo-controlled phase III trials in newly diagnosed glioblastoma reported prolonged progression-free survival (PFS), but not overall survival (OS), with the addition of bevacizumab to radiotherapy/temozolomide. To establish whether certain patient subgroups derived OS benefit from the addition of bevacizumab to first-line standard-of-care therapy, AVAglio patients were retrospectively evaluated for molecular subtype, and bevacizumab efficacy assessed for each patient subgroup. A multivariate analysis accounting for prognostic covariates revealed that bevacizumab conferred a significant OS advantage versus placebo for patients with Proneural IDH1 wild-type tumors (17.1 v 12.8 months, respectively; hazard ratio, 0.43; 95% CI, 0.26 to 0.73; P = .002). This analysis also revealed an interaction between the Proneural subtype biomarker and treatment arm (P = .023). The group of patients with Mesenchymal and Proneural tumors derived a PFS benefit from bevacizumab, compared with placebo; however, this translated to an OS benefit in the Proneural subset only. Retrospective analysis of AVAglio data suggests that patients with IDH1 wild-type Proneural glioblastoma may derive OS benefit from first-line bevacizumab treatment. The predictive value of the Proneural subtype observed in AVAglio should be validated in an independent dataset.

2016-07-06 | GSE84010 | GEO

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