title: Prognostic value of microvascular density in dukes a and B (t1-t4, n0, m0) colorectal carcinomas.
abstract: BACKGROUND
  Aproximatelly 30% of patients operated on for colorectal cancer (CRC), with an expectedly favourable prognosis (Dukes A-B/T1-T4, N0, M0) suffer recurrence and/or die.
  
  
  METHODS
  In order to determine if tumor microvascular density (MVD) is a prognostic factor in CRC, samples from tumors of 104 Dukes A-B CRC patients were retrospectively studied. Immunohistochemistry was performed for anti-CD34 antibody to visualize tumor vascularisation. MVD was expressed as the total number of vessels and as the percentage of microvascular area. We calculated MVD with a morphometry program and performed descriptive, bivariate, and survival statistics.
  
  
  RESULTS
  The mean number of vessels was 37.37/200x field, and the mean vascular area was the 3.972%. 30% of the patients with < 37 vessels/field, and 21% of the patients with > 37 vessels/field, experienced recurrence/death. The 35% of patients with < 4% of vascular area died following recurrence, compared with 14% of patients with > or =4% of vascular area. These differences in % of vascular area were statistically significant.
  
  
  CONCLUSIONS
  MVD expressed as the total number of vessels had no a statistically significant influence on the evolution of CRC. However, neoplasias with a greater % of vascular were associated to a better outcome.
authors.affiliation: Digestive Service, Hospital Universitario Miguel Servet, 50009, Zaragoza, Spain. uribarrenaa@hotmail.com
authors.forename: Rafael
authors.initials: R
authors.lastname: Uribarrena A
authors.forename: Javier
authors.initials: J
authors.lastname: Ortego
authors.forename: Javier
authors.initials: J
authors.lastname: Fuentes
authors.forename: Nuria
authors.initials: N
authors.lastname: Raventós
authors.forename: Pilar
authors.initials: P
authors.lastname: Parra
authors.forename: Rafael
authors.initials: R
authors.lastname: Uribarrena E