DB16954 (Ezeprogind) is a small molecule drug developed to treat Progressive Supranuclear Palsy (PSP), a tauopathy-related neurodegenerative disorder, by targeting the Progranulin– Prosaposin (PGRN–PSAP) axis and enhancing lysosomal function [94]. The gene discussed is GRN; the disease is progressive supranuclear palsy.