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Phase 2 Study of ABX-EGF (Panitumumab) in Japanese Subjects With M-colorectal Cancer

ABSTRACT: The primary objective of this study is to assess the effect of treatment with ABX-EGF on best overall objective response rate by modified RECIST (confirmed complete or partial response) in Japanese subjects with metastatic colorectal cancer.

DISEASE(S): Metastatic Colorectal Cancer,Colorectal Cancer,Colorectal Neoplasms

PROVIDER: 2029020 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Evaluating ABX-EGF in Patients With Metastatic ColorectalCarcinoma

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6KR-EGFR expressing MCF7 following EGF or HRG stimulation

Project description:EGF and HRG, growth factor ligands for EGFR and ErbB3/4 receptor, induce transient and sustained ERK activity associated with cellular proliferation and differentiation of MCF-7 cells, respectively. To rigorously analyze the effect of ERK signal duration for mRNA expression dynamics and its relationship with cell determination, we modified the EGF-triggered ERK signal duration by changing the EGFR activation dynamics by impairing the ubiquitination and degradation process. Mutation of the six lysine residues (6KR; K692, K713, K730, K843, K905 and K946) of the EGFR responsible for ubiquitin conjugation has shown sustained phosphorylation of the receptor (Huang et al, 2006; Goh et al, 2010). Therefore we constructed the MCF-7 cell lines that stably express 6KR EGFR (6KR), and analyzed signaling and mRNA expression dynamics in response to EGF and HRG.

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Evaluating ABX-EGF Extended Therapy in Subjects With MetastaticColorectal Cancer

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Egr1 regulates the coordinated expression of numerous EGF receptor target genes as identified by ChIP-on-chip

Project description:Previous studies have revealed that UV-stimulation of a variety of cells leads to activation of the EGF receptor, induction of Egr1, growth inhibition and apoptosis. On the other hand both Egr1 and EGF receptor activation are implicated in promoting the progression of prostate cancer. We treated M12 tumorigenic prostate epithelial cells which express little Egr1 with UV irradiation which rapidly activated the EGF receptor and elevated Egr1. Treatment with specific EGFR and ERKI/II inhibitors (PD153035 and UO126, respectively) confirmed that the upregulation of Egr1 was downstream of EGFR and ERKI/II Map kinase pathway. ChIP on chip experiments using Egr1 antibody identified 288 significantly bound promoters upon UV stimulation. Of these target genes, 40% had consensus Egr1 site in their promoters, considerably greater than that expected by chance (p < 0.005). The array binding results were validated by PCR analysis of 25 genes using DNA from conventional IP experiment. Affymetrix gene expression analysis of UV treated and control cells confirmed that a significant number of these bound promoters showed gene expression changes. Addition of siRNA to Egr1 confirmed that the gene expression changes were dependent upon Egr1 expression. Addition of EGF led to similar expression changes for nine tested genes. Proliferation and apoptosis assays confirmed that M12 cells undergo growth arrest and apoptosis following UV irradiation. Moreover, addition of EGF also promoted significant growth inhibition. These results indicate the M12 cells undergo a EGF receptor dependent apoptosis response upon UV-stimulation and that Egr1 mediates the regulation of numerous genes downstream of the EGF receptor that are associated with this response. Keywords: UV treatment analysis

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Egr1 regulates the coordinated expression of numerous EGF receptor target genes as identified by ChIP-on-chip

2010-05-06 | E-GEOD-10585 | biostudies-arrayexpress

Transcriptional profiling of HT-29 cells stimulated with pairwise combinations of TNF, EGF, and insulin

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A Phase 1b/2 Open Label, Dose Escalation Study of AMG 655 in Combination with AMG 479 in Subjects with Advanced, Refractory Solid Tumors.--------------------------------------------------------Estudio abierto de fase 1b/2 con escalada de dosis de AMG 655 en combinación con AMG 479 en sujetos con tumores sólidos refractarios y avanzados.

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Transcriptional profiling of HT-29 cells stimulated with pairwise combinations of TNF, EGF, and insulin

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Consequences of Nkiras deficiency for the EGF response

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Human Mammary Epithelial Cell Response to EGF, microarray analysis

Project description:To understand how integration of multiple data types can help decipher cellular responses at the systems level, we analyzed the mitogenic response of human mammary epithelial cells to epidermal growth factor (EGF) using whole genome microarrays, mass spectrometry-based proteomics and large-scale western blots with over 1000 antibodies. A time course analysis revealed significant differences in the expression of 3172 genes and 596 proteins, including protein phosphorylation changes measured by western blot. Integration of these disparate data types showed that each contributed qualitatively different components to the observed cell response to EGF and that varying degrees of concordance in gene expression and protein abundance measurements could be linked to specific biological processes. Networks inferred from individual data types were relatively limited, whereas networks derived from the integrated data recapitulated the known major cellular responses to EGF and exhibited more highly connected signaling nodes than networks derived from any individual dataset. While cell cycle regulatory pathways were altered as anticipated, we found the most robust response to mitogenic concentrations of EGF was induction of matrix metalloprotease cascades, highlighting the importance of the EGFR system as a regulator of the extracellular environment. These results demonstrate the value of integrating multiple levels of biological information to more accurately reconstruct networks of cellular response. Keywords: time-course analysis

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