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Down-regulation of CacyBP is associated with poor prognosis and the effects on COX-2 expression in breast cancer

Fang Nie1, Xiao-Ling Yu, Xiao-Ge Wang

  • 1Department of Respiratory Medicine, the Fourth Affiliated Hospital of China Medical University, Yuhong District, Shenyang City, Liaoning Province 110032, PR China.

International Journal of Oncology
|September 30, 2010
PubMed

Insights

Calcyclin-binding protein (CacyBP) is often reduced in breast cancer, correlating with poor prognosis and increased cell invasion. Its regulation of COX-2 suggests CacyBP as a potential therapeutic target for breast cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Calcyclin-binding protein (CacyBP) has a dual role as a tumor suppressor or oncogene depending on cancer type.
  • Its specific function in breast cancer remains largely uncharacterized.

Purpose of the Study:

  • To investigate the clinical significance of CacyBP in breast cancer.
  • To explore the relationship between CacyBP and COX-2 in breast carcinogenesis.

Main Methods:

  • Immunohistochemical analysis of 172 breast tissue samples.
  • RT-PCR and Western blot to assess CacyBP mRNA and protein levels.
  • Correlation analysis with clinicopathological data and COX-2 expression.

Main Results:

  • CacyBP expression was significantly lower in invasive ductal carcinoma (IDC) compared to normal breast tissues.
  • Reduced CacyBP expression correlated with poor differentiation, advanced TNM stage, lymphatic metastasis, and unfavorable prognosis.
  • CacyBP expression was inversely associated with COX-2 expression.
  • CacyBP knockdown enhanced breast cancer cell proliferation and invasion, dependent on COX-2.

Conclusions:

  • CacyBP acts as a tumor suppressor in breast cancer, with its downregulation linked to disease progression.
  • The inverse relationship between CacyBP and COX-2 suggests a regulatory role in breast carcinogenesis.
  • Restoring CacyBP expression presents a potential therapeutic strategy for breast cancer.

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