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Such differences are also seen in the CTC and DTC pools when breast cancer biomarkers are evaluated. In a study focusing on developing a multimarker panel for the characterization of CTCs in patients with metastatic breast cancer, it was incidentally noted that the CTCs were HER2 positive in 27% of the patients with HER2-negative disease [25]. In an earlier study with 254 patients evaluating ER-positive DTCs, the concordance between primary tumour and DTC was only 28% [26]. Furthermore, within the population of DTCs, ER expression was heterogeneous in 26% of patients [26]. The findings of a study comparing the evolution of bone marrow DTCs to that of peripheral blood CTCs also suggest that these two populations may be quite different even within an individual patient. DTCs in the marrow were found with much greater http://www.selleck.cn/products/incb024360.html frequency (24% of 431 patients) than CTCs in the peripheral blood (13%) [27]. In addition, DTCs in the bone marrow correlated only with the PR status of the primary tumour, whereas CTCs in the blood correlated with ER status, PR status and node positivity of the primary tumour. A weak (P?=?0.05) correlation was noted between the biomarker expressions of DTCs and CTCs from the same patient. However, CTCs in the blood were significantly associated with triple-negative primary tumours and were nearly always http://www.selleckchem.com/products/bmn-673.html triple negative themselves [27]. Consequently, DTC/CTC survival and proliferation into overt metastases may be related to the ability of these cells to regulate critical signalling http://www.selleckchem.com/products/cobimetinib-gdc-0973-rg7420.html pathways already known to drive breast cancer cell growth, specifically pathways involving oestrogen, progesterone and HER2. Furthermore, as these studies demonstrate, the histopathology of the primary tumour may not always direct the best treatment options for targeting metastatic disease. Although CTCs can be found with reproducible frequency in the peripheral blood of patients with breast cancer, results from preclinical studies suggest that the majority of CTCs/DTCs will not form a clinically detectable overt metastasis [28]. Indeed, results suggest that