title: Thymidine phosphorylase expression and stromal vascularity in ductal carcinoma in situ of the breast.
abstract: OBJECTIVE
  Periductal angiogenesis in ductal carcinoma in situ is associated with an increased risk of subsequently developing a recurrence. This study aimed to (1) identify the relation between periductal and stromal vascularity and recurrence and (2) determine whether thymidine phosphorylase (TP) is associated with angiogenesis or recurrence in ductal carcinoma in situ (DCIS).
  
  
  METHODS
  Twenty cases of DCIS that did not subsequently recur, 20 that developed a subsequent in situ recurrence, and 12 that developed a subsequent invasive recurrence were investigated. Periductal and stromal (hotspot) microvessel density were determined quantitatively using antibodies to CD34 and von Willebrandt factor (vWF). TP expression by DCIS was assessed semiquantitatively using the H score method.
  
  
  RESULTS
  Stromal and periductal microvessel density assessed by anti-vWF gave similar mean values, and showed a strong positive correlation. When angiogenesis was assessed with anti-CD34 this association was lost. Not only were the mean values for both types of microvessel density higher than those obtained with anti-vWF, but the periductal microvessel density was significantly greater than the stromal microvessel density. TP expression was associated with stromal microvessel density assessed with anti-vWF, but not with anti-CD34. TP expression was not related to recurrence. No significant difference was identified in TP expression or stromal vascularity in DCIS between cases that recurred as DCIS and those that recurred as invasive carcinoma.
  
  
  CONCLUSIONS
  Recurrent in situ or invasive disease after excision of DCIS does not appear to be related to stromal microvessel density or to TP expression by DCIS cells.
authors.affiliation: Department of Pathology, University of Liverpool, Duncan Building, Daulby Street, Liverpool L69 3GA, UK.
authors.forename: N B
authors.initials: NB
authors.lastname: Teo
authors.forename: B S
authors.initials: BS
authors.lastname: Shoker
authors.forename: C
authors.initials: C
authors.lastname: Jarvis
authors.forename: J P
authors.initials: JP
authors.lastname: Sloane
authors.forename: C
authors.initials: C
authors.lastname: Holcombe
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018952:Antigens, CD34 / Q000378:metabolism; D001943:Breast Neoplasms / Q000098:blood supply / Q000201:enzymology*; D018270:Carcinoma, Ductal, Breast / Q000098:blood supply / Q000201:enzymology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008833:Microcirculation; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism*; D009364:Neoplasm Recurrence, Local / Q000201:enzymology; D009389:Neovascularization, Pathologic / Q000201:enzymology; D017154:Stromal Cells; D013939:Thymidine Phosphorylase / Q000378:metabolism*
chemical_list: D018952:Antigens, CD34; D009363:Neoplasm Proteins; D013939:Thymidine Phosphorylase