APOE and Alzheimer disease: There were no differences in age, sex, MMSE score, or CDR between the 14 participants (all were ɛ3/ ɛ4) in the APOE ɛ4-positive AD group [ɛ4(+) AD] and the 12 participants (all were ɛ3/ ɛ3) in the APOE ɛ4-negative AD group [ɛ4(−) AD].