Abstract 4568: Estrogen receptor and progesterone receptor immunocytochemistry staining in circulating tumor cells as compared to primary tumor or metastatic biopsy
Abstract:Introduction: Hormone receptor (estrogen receptor (ER) and progesterone receptor (PR)) status in all breast cancer patients is recommended by immunohistochemistry (IHC) and is considered standard practice for selection of treatment options. However, the analytical sensitivity of IHC in detecting low levels of ER/PR is often poor and likely due to methodological variation. Because biopsy is not often feasible in all patients presenting with recurrent and/or metastatic breast disease, circulating tumor cells (CT… Show more
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