IL4 and frontotemporal dementia: Patients with FTD who had a longer disease duration had increased proinflammatory factor levels (IL-2, 110.69 ± 44.29 vs. 208.64 ± 389.87, p = 0.0262) and decreased anti-inflammatory factor levels (IL-4, 42.46 ± 19.78 vs. 28.77 ± 14.46, p = 0.0219).