IGF1R and neuroblastoma: To improve the understanding for the influence of different parameters on the post-modification of liposomal drug delivery systems, liposomes in this study where either composed of SPC/Chol or HSPC/Chol/DSPE-mPEG (as in Caelyx®) and modified with either anti-GD2-ab (hu14.18, neuroblastoma model) or anti-IGF1R-ab (1H7, GEP-NET model).