BAG-1 expression correlates with Bcl-2, p53, differentiation, estrogen and progesterone receptors in invasive breast carcinoma

Shou Ching Tang, Jessalyn Beck, Sean Murphy, Garry Chernenko, Desmond Robb, Peter Watson, Mahmoud Khalifa

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

BAG-1, a recently identified anti-apoptotic protein, is overexpressed in the majority of invasive breast carcinomas. Overexpression of BAG-1 is important for both multi-step oncogenesis and resistance of cancer cells to apoptosis induced by DNA-damaging alkylating agents. BAG-1 protein species are localized differentially; nuclear expression may be associated with a shorter disease-free and overall survival in early stage breast cancer, while cytoplasmic expression has been associated with longer survival in non-small cell lung cancer. Growing evidence suggests that Bcl-2 and p53 are also involved in the oncogenesis of breast cancer. Since BAG-1 interacts with Bcl-2 and is upregulated by mutant p53 in vitro, it would be interesting to determine if their expressions are correlated with each other and with other clinical prognostic factors in invasive breast cancer. To address this question we conducted a large scale retrospective study of BAG-1, Bcl-2 and p53 in 185 breast cancer patients. Our study again showed that BAG-1 is overexpressed in the majority of breast cancer patients. In addition, it demonstrated that the expression of BAG-1 correlates with that of Bcl-2, p53, differentiation, estrogen and progesterone receptors. Our clinical study supports the preclinical finding of the interaction between BAG-1 and Bcl-2, p53 and estrogen and progesterone receptors. Further experiments to explore the prognostic and therapeutic role of BAG-1 in breast cancer are warranted.

Original languageEnglish (US)
Pages (from-to)203-213
Number of pages11
JournalBreast Cancer Research and Treatment
Volume84
Issue number3
DOIs
StatePublished - Apr 1 2004

Keywords

  • BAG-1
  • Bcl-2
  • Breast cancer
  • Prognostic factors
  • p53

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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