Nature Communications, Published online: 14 September 2026; doi:10.1038/s41467-026-77638-2 Treatment for frontotemporal dementia due to GRN haploinsufficiency (FTD-GRN) are lacking. Here, in this preclinical and Phase 1 clinical trial, the authors show that VES001, an oral small molecule sortilin inhibitor, is safe and well tolerated, and increased progranulin levels.