title: Identification of common predictive markers of in vitro response to the Mek inhibitor selumetinib (AZD6244; ARRY-142886) in human breast cancer and non-small cell lung cancer cell lines.
abstract: Selumetinib (AZD6244; ARRY-142886) is a tight-binding, uncompetitive inhibitor of mitogen-activated protein kinase kinases (MEK) 1 and 2 currently in clinical development. We evaluated the effects of selumetinib in 31 human breast cancer cell lines and 43 human non-small cell lung cancer (NSCLC) cell lines to identify characteristics correlating with in vitro sensitivity to MEK inhibition. IC(50) <1 micromol/L (considered sensitive) was seen in 5 of 31 breast cancer cell lines and 15 of 43 NSCLC cell lines, with a correlation between sensitivity and raf mutations in breast cancer cell lines (P = 0.022) and ras mutations in NSCLC cell lines (P = 0.045). Evaluation of 27 of the NSCLC cell lines with Western blots showed no clear association between MEK and phosphoinositide 3-kinase pathway activation and sensitivity to MEK inhibition. Baseline gene expression profiles were generated for each cell line using Agilent gene expression arrays to identify additional predictive markers. Genes associated with differential sensitivity to selumetinib were seen in both histologies, including a small number of genes in which differential expression was common to both histologies. In total, these results suggest that clinical trials of selumetinib in breast cancer and NSCLC might select patients whose tumors harbor raf and ras mutations, respectively.
authors.affiliation: 1Department of Medicine, Division of Hematology/Oncology, Geffen School of Medicine at UCLA, Los Angeles, California, USA. egaron@mednet.ucla.edu
authors.forename: Edward B
authors.initials: EB
authors.lastname: Garon
authors.forename: Richard S
authors.initials: RS
authors.lastname: Finn
authors.forename: Wylie
authors.initials: W
authors.lastname: Hosmer
authors.forename: Judy
authors.initials: J
authors.lastname: Dering
authors.forename: Charles
authors.initials: C
authors.lastname: Ginther
authors.forename: Shahriar
authors.initials: S
authors.lastname: Adhami
authors.forename: Naeimeh
authors.initials: N
authors.lastname: Kamranpour
authors.forename: Sharon
authors.initials: S
authors.lastname: Pitts
authors.forename: Amrita
authors.initials: A
authors.lastname: Desai
authors.forename: David
authors.initials: D
authors.lastname: Elashoff
authors.forename: Tim
authors.initials: T
authors.lastname: French
authors.forename: Paul
authors.initials: P
authors.lastname: Smith
authors.forename: Dennis J
authors.initials: DJ
authors.lastname: Slamon
mesh_terms: D001562:Benzimidazoles / Q000494:pharmacology*; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000235:genetics; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D016000:Cluster Analysis; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D020128:Inhibitory Concentration 50; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D019950:Mitogen-Activated Protein Kinase 1 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D011237:Predictive Value of Tests; D047428:Protein Kinase Inhibitors / Q000494:pharmacology*; D051057:Proto-Oncogene Proteins c-akt / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D048490:raf Kinases / Q000235:genetics; D018631:ras Proteins / Q000235:genetics
chemical_list: C517975:AZD 6244; D001562:Benzimidazoles; D014408:Biomarkers, Tumor; D047428:Protein Kinase Inhibitors; D051057:Proto-Oncogene Proteins c-akt; D048490:raf Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D018631:ras Proteins