p = 0.0049 BB7 * placebo tamoxifen BB9 placebotamoxifen p = 0.015 * Tamoxifen treatment of ER+ primary breast cancer xenografts enriches for CSC activity 14 days treatment of tumour xenograft in vivo 0 1 Mammosphere Formation (%) 0 0.5 Mammosphere Formation (%) Ciara O'Brien
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