FLT1 and neoplasm: It has been found that co-modification of liposomes decorated with Ala-Pro-Arg-Pro-Gly (APRPG containing PRP motif for targeting vascular endothelial growth factor receptor-1 (VEGFR-1)) with either Gly-Asn-Gly-Arg-Gly (GNGRG containing NGR motif for targeting CD13 receptor) [56] or Gly-Arg-Gly-Asp-Ser (GRGDS containing RGD motif) [57] augments liposome affinity towards tumor vasculature [56,57].