title: Comparison of the blood and lymphatic microvessel density of pleomorphic adenoma and Basal cell adenoma.
abstract: BACKGROUND
  Pleomorphic adenoma (PA) is the most common tumor of the salivary gland, while basal cell adenoma (BCA) is an uncommon neoplasm. Blood and lymphatic vessels are crucial for tumor metabolism. The aim of this study was to compare the blood and lymphatic vascular density and vascular and endothelial growth factor (VEGF) expression in PA and BCA tumors. In addition, cell proliferation was evaluated in these tumors.
  
  
  METHODS
  Blood and lymphatic vessel content, VEGF expression, and cell proliferation were analyzed in 30 cases of PA and 13 cases of BCA by immu-nohistochemistry using antibodies for CD34, CD105, D2-40, VEGF, and Mcm-2.
  
  
  RESULTS
  Regarding CD34 and CD105 expression, PA demonstrated a high vascularity and a low number of positive vessels, respectively. D2-40-positive lymphatic vessels were mainly located in the tumor capsules, with small intratumoral lymphatic vessels observed occasionally. VEGF expression revealed a remarkably heterogeneous immunoreactivity, alternating from weak or negative to positive or intense. BCA presented significantly higher CD34, CD34, CD105, D2-40, and VEGF expression compared to PA. No significant difference was found in cell proliferation between the tumors.
  
  
  CONCLUSIONS
  Although PA and BCA are considered part of the same spectrum of differentiation, this study showed that the blood and lymphatic vascularization of these tumors is different.
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Andresa Borges
authors.initials: AB
authors.lastname: Soares
authors.affiliation: Department of Pathology, School of Medicine, State University of Campinas (UNICAMP), São Paulo, Brazil.
authors.forename: Albina
authors.initials: A
authors.lastname: Altemani
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Thais Ribeiro
authors.initials: TR
authors.lastname: de Oliveira
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Felipe
authors.initials: F
authors.lastname: de Oliveira Fonseca Rodrigues
authors.affiliation: Department of Pathology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil.
authors.forename: Alfredo
authors.initials: A
authors.lastname: Ribeiro-Silva
authors.affiliation: Department of Pathology, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil.
authors.forename: Danilo Figueiredo
authors.initials: DF
authors.lastname: Soave
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Fabricio
authors.initials: F
authors.lastname: Passador-Santos
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Suellen Trentin
authors.initials: ST
authors.lastname: Brum
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Marcelo Henrique
authors.initials: MH
authors.lastname: Napimoga
authors.affiliation: Department of Oral Pathology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil.
authors.forename: Vera Cavalcanti
authors.initials: VC
authors.lastname: de Araújo
keywords: basal cell adenoma; blood vessel; lymph vessel; pleomorphic adenoma; vascular density