VASP and breast cancer: Ena/VASP proteins (Mena, EVL and VASP) enhance processive filament elongation.8, 9, 10, 11, 12, 13, 14 Mena is upregulated in breast cancer and promotes invasion.15, 16 We identified Lamellipodin (Lpd) as a binding partner of Ena/VASP proteins.5, 17, 18 Lpd localizes to lamellipodia, thin membrane protrusions at the leading edge of migrating cells.17 The Lpd-Ena/VASP interaction is positively regulated by Abl kinase-mediated Lpd phosphorylation, which drives Ena/VASP recruitment to lamellipodia by Lpd.19