title: Gene expression profiles associated with response to chemotherapy in epithelial ovarian cancers.
abstract: OBJECTIVE
  The goal of this study was to determine whether distinct gene expression profiles are associated with intrinsic and/or acquired chemoresistance in epithelial ovarian carcinoma.
  
  
  METHODS
  Gene expression profiles were generated from 21 primary chemosensitive tumors and 24 primary chemo-resistant tumors using cDNA-based microarrays. Gene expression profiles of both groups of primary tumors were then compared with those of 15 ovarian carcinomas obtained following platinum-based chemotherapy ("post-chemotherapy" tumors). A theme discovery tool was used to identify functional categories of genes involved in drug resistance.
  
  
  RESULTS
  Comparison of primary chemosensitive and chemo-resistant tumors revealed differential expression of 85 genes (P < 0.001). Comparison of gene expression profiles of primary chemosensitive tumors and post-chemotherapy tumors revealed more robust differences with 760 genes differentiating the two groups (P < 0.001). In contrast, only 230 genes were differentially expressed between primary chemo-resistant and post-chemotherapy groups (P < 0.001). Common to both gene lists were 178 genes representing transcripts differentially expressed between post-chemotherapy tumors and all primary tumors irrespective of intrinsic chemosensitivity. The gene expression profile of post-chemotherapy tumors compared with that of primary tumors revealed statistically significant overrepresentation of genes encoding extracellular matrix-related proteins.
  
  
  CONCLUSIONS
  These data show that gene expression profiling can discriminate primary chemo-resistant from primary chemosensitive ovarian cancers. Gene expression profiles were also identified that correlate with states of intrinsic and acquired chemoresistance and that represent targets for future investigation and potential therapeutic interventions.
authors.affiliation: Laboratory of Biosystems and Cancer, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland, USA.
authors.forename: Amir A
authors.initials: AA
authors.lastname: Jazaeri
authors.forename: Christopher S
authors.initials: CS
authors.lastname: Awtrey
authors.forename: Gadisetti V R
authors.initials: GV
authors.lastname: Chandramouli
authors.forename: Yao Eric
authors.initials: YE
authors.lastname: Chuang
authors.forename: Javed
authors.initials: J
authors.lastname: Khan
authors.forename: Christos
authors.initials: C
authors.lastname: Sotiriou
authors.forename: Olga
authors.initials: O
authors.lastname: Aprelikova
authors.forename: Cindy J
authors.initials: CJ
authors.lastname: Yee
authors.forename: Kristin K
authors.initials: KK
authors.lastname: Zorn
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Birrer
authors.forename: J Carl
authors.initials: JC
authors.lastname: Barrett
authors.forename: Jeff
authors.initials: J
authors.lastname: Boyd
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000235:genetics*; D018269:Carcinoma, Endometrioid / Q000188:drug therapy / Q000235:genetics; D018284:Cystadenocarcinoma, Serous / Q000188:drug therapy / Q000235:genetics; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007124:Immunoenzyme Techniques; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000235:genetics*; D009367:Neoplasm Staging; D020411:Oligonucleotide Array Sequence Analysis; D010051:Ovarian Neoplasms / Q000188:drug therapy / Q000235:genetics*; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000970:Antineoplastic Agents; D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins; D012334:RNA, Neoplasm