title: Expression of P53, P27 and KI-67 in colorectal cancer patients of various ethnic origins: clinical and tissue microarray based analysis.
abstract: BACKGROUND
  This study was conducted to determine survival according to the expression of molecular markers in colorectal cancer (CRC) patients of various ethnic origins.
  
  
  METHODS
  Resection of primary tumor was conducted on 171 patients with CRC. Corresponding archived paraffin-embedded blocks were retrieved and tissue microarray (TMA) constructed. Immunohistochemical staining of the TMA for p53, p27 and Ki-67 was quantified by two independent pathologists. Survival was analyzed using the Kaplan-Meier product limit method.
  
  
  RESULTS
  With a median follow-up of 65 months, 56 patients (32.7%) died of disease. AJCC stage correlated with disease-free (DFS, P < 0.0001) and overall survival (OS, P < 0.0001). IHC staining was positive for Ki-67 in 77.4%, p53 in 55.8% and p27 in 54.2% of patients. Primary tumor marker expression did not correlate with DFS or OS. The 5-year DFS for Ashkenazi Jews was 75%, significantly higher than Sephardic Jews (SJ) 64% and Palestinian Arabs (PA) 38%, P = 0.001.
  
  
  CONCLUSIONS
  Ethnicity among Ashkenazi and SJ and PA appears to have a significant impact on disease outcome in patients with CRC patients, while primary tumor expression of p53, p27 and Ki-67 was unrelated to disease outcome.
authors.affiliation: Department of Surgery, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
authors.forename: Tzeela
authors.initials: T
authors.lastname: Cohen
authors.forename: Diana
authors.initials: D
authors.lastname: Prus
authors.forename: Jinru
authors.initials: J
authors.lastname: Shia
authors.forename: Bassam
authors.initials: B
authors.lastname: Abu-Wasel
authors.forename: Meir G
authors.initials: MG
authors.lastname: Pinto
authors.forename: Herbert R
authors.initials: HR
authors.lastname: Freund
authors.forename: Alexander
authors.initials: A
authors.lastname: Stojadinovic
authors.forename: Anna
authors.initials: A
authors.lastname: Grakov
authors.forename: Tamar
authors.initials: T
authors.lastname: Peretz
authors.forename: Aviram
authors.initials: A
authors.lastname: Nissan
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000401:mortality / Q000473:pathology; D000328:Adult; D000367:Age Factors; D018912:Arabs; D014408:Biomarkers, Tumor / Q000378:metabolism; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D050760:Cyclin-Dependent Kinase Inhibitor p27 / Q000378:metabolism*; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007150:Immunohistochemistry; D007585:Jews; D019394:Ki-67 Antigen / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009364:Neoplasm Recurrence, Local; D040081:Protein Array Analysis; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D019394:Ki-67 Antigen; D016159:Tumor Suppressor Protein p53; D050760:Cyclin-Dependent Kinase Inhibitor p27