Abstract
Breast cancer is the most common malignancy worldwide in females, representing 29% of all cancer new cases and 14% of cancer deaths in the world. Amongst the reasons for the high mortality rate is resistance to chemotherapy resulting in therapeutic failure. Various studies have shown that the presence of cancer stem cells (CSCs) in breast tumors is responsible for chemotherapy resistance and tumor recurrence. This CSC population possesses the characteristics of normal stem cells, including their ability to self-renewal and give rise to other epithelial cells. One thing that unique to the CSC population is their ability to escape from chemotherapy drugs; this can make them resistant to therapy and able to repopulate the cancer. Isolation and enrichment of breast CSCs (BCSCs) is required in order to study their characteristics and the behavior that enables them to drive breast tumor development, in order to develop better therapies. This chapter describes a method for the isolation and enrichment of BCSCs from the MCF7 breast cancer cell line, which consists of a heterogeneous breast cancer cell population. This method depends on cancer stem cell behavior, specifically an ability to self-renew and form spheroids in harsh conditions that allow only cancer cells with stem cell characteristics to survive and form spheroids.
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