BACKGROUND: The aim of this study was to evaluate the prognostic impact of quantitative estrogen receptor (ER) expression at relapse for ER-positive breast cancer with ER-positive recurrence. PATIENTS AND METHODS: A total of 81 patients with ER-positive primary breast cancer and ER-positive paired recurrence were included. ER expression was evaluated as the percentage of tumor cells staining for ER under immunohistochemistry. Samples were defined as ER-high (ER>50%) or ER-low (ER≥10% and ≤50%). RESULTS: Quantitative ER expression on relapse biopsy was an independent prognostic factor for overall survival in multivariate analysis, both as a continuous (hazard ratio=0.8; 95% confidence interval=0.7-0.92, p=0.001) and as a categorical (ER-high vs. ER-low; hazard ratio=0.26; 95% confidence interval=0.11-0.59, p=0.001) variable. Patients whose status changed from ER-high (primary BC) to ER-low (relapse) had the poorest outcome, with a 10-year overall survival rate of 14%. CONCLUSION: Even in the case of maintenance of ER-positivity on primary and relapse of breast cancer, recurrence biopsy provides prognostic information.

Quantitative expression of estrogen receptor on relapse biopsy for ER-positive breast cancer: prognostic impact / Dieci, Maria Vittoria; Piacentini, Federico; Dominici, Massimo; Omarini, Claudia; Goubar, Aicha; Ficarra, Guido; Conte, Pierfranco; Guarneri, Valentina. - In: ANTICANCER RESEARCH. - ISSN 0250-7005. - ELETTRONICO. - 34:7(2014), pp. 3657-3662.

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