FOLH1 and neoplasm: Given the high expression of PSMA on endothelial cells of tumour microvasculature and to a lesser extent on tumour cells, future ssIA-PMSA-based RLT will likely be most effective using beta-emitting radioligands, such as lutetium-177, that are characterised by a longer path length (0.05–12 mm) compared to alpha-emitters (40–100 μm).