Immunohistochemistry confirmed high levels of FAP expression, predominantly in CAFs, in multiple tumour types including pancreatic, breast, and sarcoma….FAP-2286 labelled with the therapeutic β-particle emitting radionuclide 177Lu, at a specific activity of 30 MBq/nmol (low-dose group) or 60 MBq/nmol (high-dose group), had potent anti-tumour activity in FAP expressing HEK-293 xenografts after a single IV dose: tumour growth inhibition at day 14 posttreatment was 112% and 115%, respectively, with no significant weight loss.