Optimized polyethylenimine (PEI)-based nanoparticles for siRNA delivery, analyzed in vitro and in an ex vivo tumor tissue slice culture model - Alexander Ewe; Sabrina Höbel; Claudia Heine; Lea Merz; Sonja Kallendrusch; Ingo Bechmann; Felicitas Merz; Heike Franke; Achim Aigner (Drug Delivery and Translational Research, 2017)