Growth arrest-specific gene 6 expression in human breast cancer
O Mc Cormack1, W Y Chung, P Fitzpatrick
1UCD School of Medicine and Medical Science, UCD Conway Institute, Belfield, Dublin 4, Ireland.
British Journal of Cancer
|February 20, 2008
Summary
Growth arrest-specific gene 6 (Gas6) is linked to progesterone receptor B (PRB) in breast cancer. Higher Gas6 levels correlate with favorable prognostic factors, suggesting a potential role in breast cancer progression.
Area of Science:
- Molecular Biology
- Oncology
- Biochemistry
Background:
- Growth arrest-specific gene 6 (Gas6) functions as a ligand for the Axl/Tyro3 tyrosine kinase receptor family.
- Overexpression of Axl/Tyro3 receptors is observed in various cancers, including breast, ovarian, and lung tumors.
- Gas6 is significantly upregulated by progesterone via progesterone receptor B (PRB) and is implicated in breast cancer.
Purpose of the Study:
- To investigate the association between progesterone receptor B (PRB) and Gas6 mRNA levels in primary breast carcinomas.
- To explore the correlation between Gas6 expression and established prognostic variables in breast cancer patients.
Main Methods:
- Quantitative real-time PCR was employed to measure Gas6 mRNA expression in 49 primary breast carcinomas.
- Immunohistochemistry was utilized to assess the expression of PRB protein using a commercial antibody.
Main Results:
- A statistically significant positive association was found between PRB protein expression and Gas6 mRNA levels (P=0.04).
- Gas6 expression demonstrated positive correlations with favorable prognostic indicators: lymph node negativity (P=0.0002), younger age (P=0.04), smaller tumor size (P=0.02), low Nottingham prognostic index scores (P=0.03), and low nuclear morphology scores (P=0.03).
Conclusions:
- This study provides the first verification of a direct association between PRB and Gas6 within breast cancer tissue.
- The findings suggest that Gas6 may be a favorable prognostic marker in breast cancer, potentially influenced by PRB status.
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