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5, 000, 1, 000, 500, and 100 isolated ESA, CD44, CD24 low, Lin, IL1R2, and E cadherin cancer stem cells versus identical numbers of ESA, CD44, CD24 low, and Lin cancer stem cells or unsorted dissociated tumor cells are injected into the mammary fat pads of VP 16 and estrogen pretreated NOD SCID mice propecia prescription