Multiple brain cytokines were elevated in Alzheimer’s disease and vascular dementia: IL-15 and IL-17A were maximally elevated in end-stage Alzheimer’s disease (Braak tangle stage V–VI) whereas IL-2, IL-5, IL12p40 and IL-16 were highest in intermediate Braak tangle stage III–IV disease. This evidence concerns the gene IL2 and early-onset autosomal dominant Alzheimer disease.