title: Analysis of gene expression profile of pancreatic carcinoma using cDNA microarray.
abstract: OBJECTIVE
  To identify new diagnostic markers and drug targets, the gene expression profiles of pancreatic cancer were compared with that of adjacent normal tissues utilizing cDNA microarray analysis.
  
  
  METHODS
  cDNA probes were prepared by labeling mRNA from samples of six pancreatic carcinoma tissues with Cy5-dUTP and mRNA from adjacent normal tissues with Cy3-dUTP respectively through reverse transcription. The mixed probes of each sample were then hybridized with 12 800 cDNA arrays (12 648 unique human cDNA sequences), and the fluorescent signals were scanned by ScanArray 3 000 scanner (General Scanning, Inc.). The values of Cy5-dUTP and Cy3-dUTP on each spot were analyzed and calculated by ImaGene 3.0 software (BioDiscovery, Inc.). Differentially expressed genes were screened according to the criterion that the absolute value of natural logarithm of the ratio of Cy5-dUTP to Cy3-dUTP was greater-than 0.69.
  
  
  RESULTS
  Among 6 samples investigated, 301 genes, which accounted for 2.38 % of genes on the microarry slides, exhibited differentially expression at least in 5. There were 166 over-expressed genes including 136 having been registered in Genebank, and 135 under-expressed genes including 79 in Genebank in cancerous tissues.
  
  
  CONCLUSIONS
  Microarray analysis may provide invaluable information on disease pathology, progression, resistance to treatment, and response to cellular microenvironments of pancreatic carcinoma and ultimately may lead to improving early diagnosis and discovering innovative therapeutic approaches for cancer.
authors.affiliation: Department of General Surgery, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.
authors.forename: Zhi-Jun
authors.initials: ZJ
authors.lastname: Tan
authors.forename: Xian-Gui
authors.initials: XG
authors.lastname: Hu
authors.forename: Gui-Song
authors.initials: GS
authors.lastname: Cao
authors.forename: Yan
authors.initials: Y
authors.lastname: Tang
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D004798:Enzymes / Q000235:genetics; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D005819:Genetic Markers; D006801:Humans; D009363:Neoplasm Proteins / Q000032:analysis / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D010190:Pancreatic Neoplasms / Q000235:genetics*; D012334:RNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification
chemical_list: D014408:Biomarkers, Tumor; D004798:Enzymes; D005819:Genetic Markers; D009363:Neoplasm Proteins; D012334:RNA, Neoplasm