title: IGFBP3 mRNA expression in benign and malignant breast tumors.
abstract: BACKGROUND
  Most previous studies have focused on evaluating the association between circulating insulin-like growth factor binding protein 3 (IGFBP-3) levels and breast cancer risk. Emerging evidence over the past few years suggests that IGFBP-3 may act directly on mammary epithelial cells.
  
  
  METHODS
  To understand the role of IGFBP-3 in breast tumorigenesis, we investigated IGFBP3 mRNA expression levels in benign and malignant breast tumors and their adjacent normal tissues using real-time quantitative PCR.
  
  
  RESULTS
  Cancer tissues had significantly lower IGFBP3 expression than benign tumor tissues (p < 0.001). IGFBP3 expressions in both tumor and adjacent tissues were higher in patients who had proliferative benign tumors than in those who had non-proliferative benign tumors. Among patients with benign breast disease, IGFBP3 expression in the tumor was significantly higher than that in their adjacent normal tissue. There were no apparent associations of IGFBP3 expression in cancer tissues with either overall survival or disease-free survival in a cohort of 521 patients with breast cancer.
  
  
  CONCLUSIONS
  Our findings suggest that the expression level of IGFBP3 in breast tissues may be involved in breast tumorigenesis.
authors.affiliation: Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt University, S-1121 MCN, 1161 21st Ave, S, Nashville, TN 37232-2587, USA.
authors.forename: Zefang
authors.initials: Z
authors.lastname: Ren
authors.forename: Aesun
authors.initials: A
authors.lastname: Shin
authors.forename: Qiuyin
authors.initials: Q
authors.lastname: Cai
authors.forename: Xiao-Ou
authors.initials: XO
authors.lastname: Shu
authors.forename: Yu-Tang
authors.initials: YT
authors.lastname: Gao
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
mesh_terms: D000328:Adult; D001941:Breast Diseases / Q000378:metabolism*; D001943:Breast Neoplasms / Q000378:metabolism*; D002471:Cell Transformation, Neoplastic; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008875:Middle Aged; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D012333:RNA, Messenger