Project description:Analysis of mRNA profiles after MEK1/2 inhibition in human pancreatic cancer cell lines reveals pathways involved in drug sensitivity. We used microarrays to find gene expression patterns associated with drug response and also identified genes regulated by the MAP kinase pathway 22 pancreatic cell lines were grown in culture media containing serum and either treated with vehicle control or CI-1040 for 24 hours
Project description:RATIONALE: CI-1040 may stop the growth of tumors by blocking the enzymes necessary for cancer cell growth and by stopping blood flow to the tumor.
PURPOSE: Phase II trial to study the effectiveness of CI-1040 in treating patients who have metastatic or unresectable breast, colon, pancreatic, or non-small cell lung cancer.
| 2007351 | ecrin-mdr-crc
Project description:Expression Data from pancreatic cancer cell lines and orthotopic tumors grown with and without MEK inhibitor
Project description:We used microarrays to analyze the global expression patterns for 22 commercially available pancreatic cancer cell lines 22 pancreatic cancer cell lines were grown to 80% confluence in DMEM/FBS/PenStrep media and then harvested for total RNA
Project description:CI-1040 is an experimental drug that is being tested in patients who have advanced colorectal and lung cancer who failed no more than one prior chemotherapy regimen, breast cancer who have failed no more than 2 prior regimens and in patients with pancreatic cancer who have received no prior chemotherapy. CI-1040 is taken orally twice daily with meals. Patients are required to have blood tests periodically while receiving treatment and will be monitored closely throughout the trial for possible side effects and for response.
Project description:Melanoma cell lines were assessed for differences in gene expression patterns between the lines sensitive and resistant to BRAF and MEK inhibitor drugs. 22 BRAF-mutant melanoma cell lines were assessed for response to BRAF and MEK inhibitors in a 3 day drug treatment dose response assay. Based on the IC50, 18 lines were found to be responsive to BRAF or MEK inhibition and 4 were resistant. Normalised gene expression data generated from experimental replicate affymetrix arrays was assessed to identify differential patterns of inherent gene expression between the cell lines grouped as drug-responsive or drug-resistant. This were used to idenify specific candidate genes and pathways associated with inherent BRAF/MEK inhibitor drug resistance in melanoma cells.
Project description:The clinical efficacy of EGFR kinase inhibitors gefitinib and erlotinib is limited by the development of drug resistance. The most common mechanism of drug resistance is the secondary EGFR T790M mutation. Strategies to overcome EGFR T790M mediated drug resistance include the use of mutant selective EGFR inhibitors, including WZ4002, or by the use of high concentrations of irreversible quinazoline EGFR inhibitors such as PF299804. In the current study we develop drug resistant versions of the EGFR mutant PC9 cell line which reproducibly develops EGFR T790M as a mechanism of drug resistance to gefitinib. Neither PF299804 resistant (PFR) or WZ4002 resistant (WZR) clones of PC9 harbor EGFR T790M. Instead, they demonstrate activated IGF1R signaling as a result of loss of expression of IGFBP3 and the IGF1R inhibitor, BMS 536924, restores EGFR inhibitor sensitivity. Intriguingly, prolonged exposure to either PF299804 or WZ4002 results in the emergence of a more drug resistant subclone which contains ERK activation. A MEK inhibitor, CI-1040, partially restores sensitivity to EGFR/IGF1R inhibitor combination. Moreover, an IGF1R or MEK inhibitor used in combination with either PF299804 or WZ4002 completely prevents the emergence of drug resistant clones in this model system. Our studies suggest that more effective means of inhibiting EGFR T790M will prevent the emergence of this common drug resistance mechanism in EGFR mutant NSCLC. However, multiple drug resistance mechanisms can still emerge. Preventing the emergence of drug resistance, by targeting pathways activated in resistant cancers before they emerge, may be a more effective clinical strategy. Total of three samples with duplicate or triplicate each were analyzed.
Project description:Transcriptional changes were analyzed in two colorectal cancer, two pancreatic cancer, and one small cell lung cancer cell line following treatment with the BET inhibitor GSK525762 and/or the MEK inhibitor trametinib using Affymetrix Human Genome U133 Plus 2.0 Arrays.
Project description:In this study, we compared expression profiles between luciferase-expressing pancreatic cancer cell line MIA/luc with and without MEK inhibitor PD325901treatment in vivo.