title: Quantitative estimation of CEA and CK20 expression in tumour tissue of colorectal cancer and its liver metastases with reverse transcription and real-time PCR.
abstract: BACKGROUND
  Carcinoembryonic antigen (CEA) and cytokeratin 20 (CK20) are established tumour markers and the CEA pre-operative levels in serum have prognostic value. The aim of this study was to verify the usefulness of the estimation of CEA and CK20 gene expressions in tissues of colorectal cancers and their liver metastases.
  
  
  METHODS
  Two hundred and twenty-two specimens of colorectal cancers, their liver metastases, other liver tumours and control tissues were analysed by reverse transcription combined with real-time PCR.
  
  
  RESULTS
  The expressions of CEA and CK20 were significantly higher in tumours than in controls; there were differences between tumour types and no relationship to staging or clinical development was found. CK20 expression was inversely dependent on grading. The CEA expression in tumours did not correlate with the CEA levels in serum, but did correlate with serum tissue-specific polypeptide antigen (TPS).
  
  
  CONCLUSIONS
  The measurement of CEA and CK20 gene expressions in tumours did not supply any new prognostic information, but raised the question of the mechanism releasing CEA into the blood.
authors.affiliation: Second Clinic of Internal Medicine, Faculty Hospital Pilsen, Czech Republic.
authors.forename: Monika
authors.initials: M
authors.lastname: Cerna
authors.forename: Lubos
authors.initials: L
authors.lastname: Holubec
authors.forename: Martin
authors.initials: M
authors.lastname: Pesta
authors.forename: Stanislav
authors.initials: S
authors.lastname: Kormunda
authors.forename: Ondrej
authors.initials: O
authors.lastname: Topolcan
authors.forename: Radim
authors.initials: R
authors.lastname: Cerny
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics / Q000276:immunology* / Q000473:pathology / Q000556:secondary; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000097:blood; D002272:Carcinoembryonic Antigen / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D015179:Colorectal Neoplasms / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D015870:Gene Expression; D006801:Humans; D053554:Keratin-20; D007633:Keratins / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D008113:Liver Neoplasms / Q000235:genetics / Q000276:immunology* / Q000556:secondary*; D008875:Middle Aged; D009367:Neoplasm Staging; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D014408:Biomarkers, Tumor; D002272:Carcinoembryonic Antigen; C507499:KRT20 protein, human; D053554:Keratin-20; D012333:RNA, Messenger; D007633:Keratins