Table 2. IC₅₀ values and the drug resistance reversion index (RRI) of various formulations of PTX against MCF-7/ADR cells.

Formulations	IC50 values (μg mL–1)	RRI a
Free PTX	14.9	—
Free PTX + curcumin	9.4	1.6
PTX@PEG–PCDA	7.1	2.1
PTX@BPP	1.68	8.9
PTX/MNPs/QDs@BPP	1.70	8.7
PTX/MNPs/QDs@BPP
Plus magnetic field	0.89	16.7

^aResistance reversion index (RRI): the ratio of IC₅₀ for free paclitaxel to that of paclitaxel with reversal agents against the MCF-7/ADR cells.