Proliferation inhibition to MDA-MB-231 cells and MDA-MB-231/DOX cells (n = 3)^a.

Compounds	IC50 (μM, mean ± SEM)
	To MDA-MB-231 cells	To MDA-MB-231/DOX cells
DOX	0.3990 ± 0.0322	5.3110 ± 0.0714
DOX/AS	0.2776 ± 0.0039	1.9840 ± 0.0497
LPs-DOX/AS	0.2388 ± 0.0077*	1.0310 ± 0.0012*
R8-LPs-DOX/AS	0.2163 ± 0.0034**	0.9019 ± 0.0077**
FA-R8-LPs-DOX/AS	0.1846 ± 0.0083**	0.3279 ± 0.0045**

^a*P < 0.05, **P < 0.01, compared with DOX/AS group.