They genotyped 146 healthy controls and 112 dementia patients for APOE rs429358, rs7412, and genes associated with suicide—an association with dementia of rs4918918 (SORBS1) and rs10903034 (IFNLR1) previously associated with suicide was established, and they confirmed the association of APOEε4 with suicide. This evidence concerns the gene IFNLR1 and dementia.