Improved targeting of the αvβ3 integrin by multimerisation of RGD peptides

Purpose The integrin αvβ3 is expressed on sprouting endothelial cells and on various tumour cell types. Due to the restricted expression of αvβ3 in tumours, αvβ3 is considered a suitable receptor for tumour targeting. In this study the αvβ3 binding characteristics of an 111In-labelled monomeric, dimeric and tetrameric RGD analogue were compared.