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Lactoferrin expression in human breast cancer.
S Penco1, M A Caligo, G Cipollini
1Department of Oncology Biology and Genetics, University of Genova, Italy.
Cancer Biochemistry Biophysics
|March 30, 2000
Summary
Lactoferrin expression is frequently lost in breast cancer, unrelated to clinical factors. Estrogen receptor and DNA methylation do not explain this loss, suggesting other regulatory mechanisms.
Area of Science:
- Oncology
- Molecular Biology
Background:
- Lactoferrin, an iron-binding glycoprotein, has demonstrated anti-cancer properties in various studies.
- Its expression patterns and regulatory mechanisms in sporadic breast cancer remain incompletely understood.
Purpose of the Study:
- To investigate lactoferrin expression in sporadic breast cancer tissues.
- To explore potential correlations between lactoferrin expression and clinical parameters.
- To elucidate the molecular mechanisms underlying absent lactoferrin expression.
Main Methods:
- Analysis of lactoferrin mRNA and protein expression in 78 breast cancer samples.
- Immunohistochemical localization of lactoferrin protein.
- Correlation analysis with clinical parameters.
- Investigation of estrogen receptor expression, DNA methylation, and lactoferrin promoter mutations.
Main Results:
- Lactoferrin expression was absent in 31 out of 78 (40%) breast cancer samples at both mRNA and protein levels.
- No significant correlation was found between lactoferrin expression and clinical parameters.
- An inverse correlation between estrogen receptor (ER) expression and lactoferrin expression was observed (P < 0.0001).
- DNA methylation levels did not explain the absence of lactoferrin expression.
- A single polymorphic site was identified in the lactoferrin promoter region.
Conclusions:
- Lactoferrin expression is frequently downregulated or lost in sporadic breast cancer.
- Estrogen receptor regulation is not the primary driver of lactoferrin loss.
- Neither DNA methylation nor identified promoter mutations fully account for the absence of lactoferrin expression, indicating other regulatory pathways are involved.