Sunitinib (SU 11248) is a small molecule with good oral bioavailability that inhibits multiple receptor tyrosine kinases (RTKs) expressed on diverse tumour cells: VEGFR, PDGFR, KIT, FLT3 and endothelium, pericytes, and stroma VEGFR, PDGFR. It has the potential to inhibit directly the growth of multiple tumour types by the inhibition of multiple targets and to act negatively on antiangiogenesis.