Abbreviations	Full names
CLSM	Confocal laser microscopy
DLS	Dynamic light scattering
DMF	Dimethylformamide
DMSO	Dimethyl sulfoxide
DOX·HCL	Doxorubicin Hydrochloride
EE	The drug encapsulation efficiency
EPR effect	The enhanced permeability and retention effect
FBS	Fetal Bovine Serum
FCM	Flow cytometry
IC50	Half maximal inhibitory concentration
LC	The drug loading capacity
LLC cells	Lewis lung carcinoma cells
NPs	Nanoparticles
PBS	Phosphate buffer saline
PEG-PCL	Poly (ethylene glycol)-Poly (ε-caprolactone)
PEMA	Poly(ethylene-alt-maleic anhydride)
PLGA	Poly (lactic-co-glycolic acid)
PTS	Polyamine transport system
PVA	Poly(vinyl alcohol)
RSD	Relative standard deviation
SEM	Scanning electron microscopy
Spm	Spermine
TEM	Transmission electron microscopy