FAP and neoplasm: We aim to provide proof of concept for the feasibility of FAP-targeted photodynamic therapy in FAP-expressing cell lines in vitro and in a syngeneic murine model carrying subcutaneous and orthotopic tumours of a murine pancreatic ductal adenocarcinoma (PDAC) cell line, as PDAC is a tumour type in which FAP-expressing CAFs play a large role.