To further compare the prognostic performance of GFAP and NfL, in adjusted analysis, we evaluated the ability of baseline GFAP and NfL to predict survival after disease onset in participants with bvFTD or all FTD syndromes combined, finding that both higher GFAP and NfL concentrations associated with an increased risk of death in these groups. The gene discussed is NEFL; the disease is frontotemporal dementia.