Abstract
Purpose
The estrogen receptor (ER) is involved in control of progesterone receptor (PgR) expression and lack of PgR may be also a surrogate of altered growth factor signaling. The aim of this study was therefore to investigate PgR expression as predictive factor for response to neoadjuvant therapy and long-term outcome.
Methods
Five thousand and six hundred and thirteen patients with primary breast cancer and positive ER expression from ten German neoadjuvant trials of anthracycline and taxane-based chemotherapy were included. Pathologic complete response (pCR), disease-free survival (DFS), distant disease-free survival (DDFS), overall survival (OS), and local recurrence-free survival (LRFS) were compared according to PgR expression.
Results
The lack of PgR expression (1172 patients) was associated with grade 3 (38.4 vs. 26.3%; p < 0.001), nodal involvement (>cN2) (6.8% vs. 4.7%; p = 0.004), and HER2 positivity (36.2 vs. 22.3%; p < 0.001). pCR rates of PgR-negative tumors were higher in the entire cohort (13.8 vs. 7.5%; p < 0.001) and in the HER2-negative subgroup (11.2 vs. 5.8%; p < 0.001). In multivariable logistic regression, PgR negativity was an independent predictive factor for pCR overall (OR 1.76; p < 0.001) and in the HER2-negative patients (OR 1.99; p < 0.001). Patients with PgR-negative disease had significantly worse outcome (p < 0.001, respectively). Multivariable Cox regression analysis revealed that PgR was an independent prognostic factor for DFS, OS, DDFS, and LRFS.
Conclusion
ER-positive/PgR-negative breast carcinomas are associated with higher response but also worse long-term outcome after neoadjuvant therapy. PgR negativity is an independent predictive factor for pCR after neoadjuvant chemotherapy in ER-positive HER2-negative breast cancer.
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Acknowledgements
We would like to thank all patients, investigators, and study personnel who supported the trials and the German Breast Group for support.
Funding
This study was supported by a Grant from the German Cancer Aid (Translational Oncology project 111536, TransLuminal-B).
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Peter Fasching is a consultant for Novartis, Pfizer, and Roche and receives funding from Novartis. Claus Hanusch is a consultant for Roche, Pfizer Amgen, Asrazeneca, Celgene, and Novartis. Sherko Kuemmel is a consultant for Roche, Amgen, Novartis, Genomic Health, Cellgene, Tewa, and Dairdi-Saulay and receives funding from Roche. Frederik Marme acts as a consultant for Roche, AstraZeneca, Novartis, Amgen, and Genomic Health and receives remuneration from the aforementioned companies. All remaining authors declare that there exists no conflict of interest.
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van Mackelenbergh, M.T., Denkert, C., Nekljudova, V. et al. Outcome after neoadjuvant chemotherapy in estrogen receptor-positive and progesterone receptor-negative breast cancer patients: a pooled analysis of individual patient data from ten prospectively randomized controlled neoadjuvant trials. Breast Cancer Res Treat 167, 59–71 (2018). https://doi.org/10.1007/s10549-017-4480-5
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DOI: https://doi.org/10.1007/s10549-017-4480-5