FACS analysis for prostate cancer stem cells was based on prior publications (1 (link),19 (link),21 (link)-23 (link)). Before labeling, the cells were blocked with normal mouse IgG in 1:100 dilution for 30 min and then incubated with fluorescein isothiocyanate (FITC) or phycoerythrin (PE)-labeled rat anti mouse Sca-1 (clone E13-161.7, Phamingen) (1/100-1/200), PE-labeled rat anti-mouseCD133 (1:10) (clone MB9-3G8, Miltenyl Biotec), PE/Cy5-labeled rat anti-human/mouse CD44 (1:200) (clone IM7, BioLegend, San Diego), PE/Cy5-labeled rat anti-human/mouse CD49f (1/10) and/or FITC-lebeled goat anti mouse Trop2 (FAB1122F, R&D) for 1 h. All experiments were conducted at 4°C. Cell sorting was performed on a FACS Calibur cell sorter (BD Biosciences). The data were analyzed with FlowJo software (Tree Star, Inc., Ashland, OR).