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Updated: Jan 22, 2026

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Published on: March 20, 2020
Quantifying Argonaute 2 (Ago2) expression to stratify breast cancer.
M C Casey1, A Prakash2, E Holian3
1Discipline of Surgery, School of Medicine, Lambe institute for Translational Research, National University of Ireland, Galway, Ireland.
Argonaute-2 (Ago2) protein is often low in breast cancer, but its expression levels and localization can help predict subtypes and improve diagnostic accuracy. Further research into Ago2 dysregulation is needed for subtype-specific insights.
Area of Science:
- Molecular Biology
- Oncology
Background:
- Argonaute-2 (Ago2) is crucial for microRNA biogenesis and linked to cancer development.
- Ago2 expression and localization in breast cancer are not well understood.
Purpose of the Study:
- Determine Ago2 expression (mRNA and protein) and localization in breast cancer.
- Investigate associations between Ago2 and clinicopathological details.
Main Methods:
- Ago2 protein staining in breast cancer cell lines and tissue microarrays (TMAs).
- Correlation of staining intensity with clinicopathological data.
- Analysis of Ago2 mRNA expression and gene alterations using public databases.
Main Results:
- 64.2% of breast cancers showed weak or negative Ago2 protein staining.
- Strong Ago2 staining associated with HER2-positive/basal subtypes and receptor status.
- Ago2 mRNA levels correlated with reduced relapse-free survival.
- High Ago2 gene amplification (10-27%) observed in breast cancer.
- Ago2 expression knowledge improved subtype, ER, and PR status prediction by 20%, 15.7%, and 17.5% respectively.
Conclusions:
- Ago2 quantification aids breast cancer stratification, suggesting subtype-specific roles.
- Investigating Ago2 dysregulation mechanisms can reveal molecular differences in breast cancer subtypes.
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