Table 2.

Effect of DOX and/or RSVL on the growth of MCF-7 cells

Treatment	IC50 (μg/ml)
DOX	0.417 ± 0.107
DOX + RSVL (15 μg/ml) (supplied simultaneously)	0.056a ± 0.026
DOX + RSVL (15 μg/ml) (RSVL supplied 24 h before DOX)	0.035a,b ± 0.016

IC50: the concentration of DOX necessary to produce 50% inhibition of cell growth.

^a Significantly different from DOX at P-value < 0.05.

^b Significantly different from DOX+ RSVL (Simultaneously) at P-value < 0.05.