Performance of Pyridylthiourea‐Polyethylenimine Polyplex for siRNA‐Mediated Liver Cancer Therapy in Cell Monolayer, Spheroid, and Tumor Xenograft Models oleh Jean Baptiste Gossart, Etienne Pascal, Florent Meyer, Emilie Heuillard, Mathieu Gonçalves, Francine Gossé, Eric Robinet, Benoît Frisch, Cendrine Seguin, Guy Zuber