Apoptotic effect of TRAIL (100 ng/mL) in combination with paclitaxel, cabazitaxel and docetaxel in CSCs and non-CSCs subpopulations within DU145 and PC3 prostate cancer cells. The values represent mean ± SD (n = 6). Within CSCs subpopulation: * p < 0.05, significantly different from the respective control; # p < 0.05, significantly different from TRAIL alone. $ p < 0.05, significantly different from respective taxane alone. Within non-CSCs subpopulation: ** p < 0.05, significantly different from the respective control; ## p < 0.05, significantly different from TRAIL alone. $$ p < 0.05, significantly different from respective taxane alone. (a) Apoptotic effect of TRAIL (100 ng/mL) in combination with paclitaxel, within CSCs and non-CSCs subpopulations in PC3 prostate cancer cells; (b) Apoptotic effect of TRAIL (100 ng/mL) in combination with paclitaxel, within CSCs and non-CSCs subpopulations in DU145 prostate cancer cells; (c) Apoptotic effect of TRAIL (100 ng/mL) in combination with cabazitaxel, within CSCs and non-CSCs subpopulations in PC3 prostate cancer cells; (d) Apoptotic effect of TRAIL (100 ng/mL) in combination with cabazitaxel, within CSCs and non-CSCs subpopulations in DU145 prostate cancer cells; (e) Apoptotic effect of TRAIL (100 ng/mL) in combination with docetaxel, within CSCs and non-CSCs subpopulations in PC3 prostate cancer cells; (f) Apoptotic effect of TRAIL (100 ng/mL) in combination with docetaxel, within CSCs and non-CSCs subpopulations in DU145 prostate cancer cells.