Published in:
Open Access
01-08-2020 | Metastasis | Clinical trial
Estrogen, progesterone, and human epidermal growth factor receptor 2 discordance between primary and metastatic breast cancer
Authors:
Vincent Walter, Chiara Fischer, Thomas M. Deutsch, Catherine Ersing, Juliane Nees, Florian Schütz, Carlo Fremd, Eva-Maria Grischke, Peter Sinn, Sara Y. Brucker, Andreas Schneeweiss, Andreas D. Hartkopf, Markus Wallwiener
Published in:
Breast Cancer Research and Treatment
|
Issue 1/2020
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Abstract
Background
The estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2) statuses are frequently discordant between the primary tumor and metastatic lesions in metastatic breast cancer. This can have important therapeutic implications.
Patients and methods
In all, 541 patients with available receptor statuses from both primary tumor and metastatic lesion treated at Heidelberg and Tuebingen University Hospitals between 1982 and 2018 were included.
Results
Statistically significant discordance rates of 14% and 32% were found for ER and PR. HER2 status was statistically insignificantly discordant in 15% of patients. Gain in HER2 positivity was associated with an improved overall survival, whereas loss of HR positivity was associated with worse overall survival. Antiendocrine treatment differed in 20% of cases before and after biopsy and HER2-directed treatment in 14% of cases.
Conclusions
Receptor statuses are discordant between primary tumor and metastasis in a considerable fraction of patients with metastatic breast cancer. Next to a highly presumed predictive value with respect to efficacy of endocrine and HER2-targeted therapy, discordance seems to provide prognostically relevant information. Where feasible, metastatic lesions should be biopsied in accordance with current guidelines.