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Cytoplasmic Mineralocorticoid Receptor Expression Predicts Dismal Local Relapse-free Survival in Non-triple-negative
Anniina Jääskeläinen1,2, Arja Jukkola3, Kirsi-Maria Haapasaari2
1Department of Oncology and Radiotherapy, Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland.
Background/Aim:
The aim of the study was to investigate the prognostic role of androgen receptor (AR), mineralocorticoid receptor (MR) and glucocorticoid receptor β (GRβ) expression in HER-2 negative breast cancer patients.
Materials And Methods:
The study population (n=152) was enriched with triple-negative breast cancers (TNBC) (n=96; 63.2%). The median follow-up time was 100 months. AR, MR and GRβ immunocytochemical staining was compared with that of epithelial-mesenchymal transition (EMT) markers (vimentin, SIP1, ZEB1).
Results:
High expression of cytoplasmic MR was associated with dismal local relapse-free survival (RR=13.923; 95%CI=1.071-181.045; p=0.044) in tumours with non-TNBC phenotype. AR and GRβ were more frequently expressed in ER+/PR+/HER2- tumours, while cytoplasmic MR was more often expressed in TNBC tumours (for all, p<0.0005). GRβ and AR were associated with decreased vimentin expression (p<0.005), indicating their association with attenuated EMT.
Conclusion:
Cytoplasmic MR expression is a strong predictor of local recurrence in non-metastatic breast cancer patients with non-TNBC tumour phenotype.
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