BCL-2 was adjacent to IL-10, BCL-2 was directly related to ‘Schizophrenia,’ ‘Dementia,’ and ‘Bipolar Disorder,’ IL-10 was directly related to ‘Schizophrenia’ and ‘Alzheimer Disease,’ and APOC3 was directly related to ‘Alzheimer Disease.’ Thus, ‘Schizophrenia,’ ‘Dementia,’ ‘Bipolar Disorder’, and ‘Alzheimer Disease’ may have common genetic factors, which should be confirmed by experimental analysis. The gene discussed is BCL2; the disease is dementia.