IL13 and neoplasm: The IL-13-LCL-SIM liposomal nano-formulation used in this study is also PEGylated, which was shown to lead to extended blood circulation time by creating a steric barrier between liposomes and plasma components, leading to enhanced biodistribution and preferential accumulation to the tumor site via the enhanced permeability and retention (EPR) effect (Zhuang et al., 2012).