Background. Assessment of hormone receptor status plays a crucial role in treatment of patients with breast cancer. currently, clinicians are limited to determining the expression status of estrogen receptor (ER), progesterone receptor (pR) and HER2 only in primary breast cancer tissues, even in the presence of regional metastases.The purpose of the study was to review available data on heterogeneity of ER, pR and HER2/neu expressions in primary breast cancer and regional metastases.Material and methods. We analyzed publications available from pubmed, medline etc. using the keywords «discordance», «breast cancer», «locally advanced», «regional lymph nodes», «ER», «pR», and «HER2».Results. The clinical and prognostic role in assessing the heterogeneity of the receptor status of primary tumors and synchronous regional metastases, as well as the effect of detected discordance on treatment tactics was assessed.Conclusion. Data on the frequency of discordance in hormone receptor status between primary and metastatic breast cancer tumors and its effect on the further prognosis in breast cancer are still contradictory. However, the fact of the presence of such heterogeneity suggests that some patients with affected lymph nodes will have significant benefits from determining the status of steroid hormones and HER2 not only in the primary tumor, but also in the lymph nodes, since it will open up new opportunities for subsequent targeted therapy.
Change in the hormone receptor status following administration of neoadjuvant chemotherapy and its impact on the long-term outcome in patients with primary breast cancer