Finally, in 2020, authors further quantified salivary concentrations of Aβ40 and Aβ42 in 69 AD patients and 83 healthy subjects by means of MILLIPLEX® MAP (Human Amyloid Beta and Tau Magnetic Bead Panel—Multiplex Assay; Life Science, Darmstadt, Germany) [27]. This evidence concerns the gene MAPT and Alzheimer disease.