Folate conjugated poly(ester amine) for lung cancer therapy.

Folate conjugated poly(ester amine) (PEA) was prepared by reaction of folic acid with PEAs based on polycaprolactone (PCL) and low molecular weight polyethylenimine (LMW-PEI) with PEG as a linker. This novel gene carrier showed excellent physicochemical properties and relatively low cytotoxicity compared with PEI 25K. It showed excellent transfection efficiency through folate receptor mediated endocytosis.