Table 1.

The IC50 of Doxorubicin to MDA-MB-231 and MDA-MB-231/ADM Cells

Group	IC50 (μg/mL)
MDA-MB-231	1.65±0.23
MDA-MB-231/ADM	19.40±1.16**

Note: **P < 0.01 compared with the MDA-MB-231 group.