MAPT and Alzheimer disease: Research carried out in Taiwan examined plasma biomarkers such as Aβ1–42, Aβ1–40, total tau, and phosphorylated tau, with one study highlighting the potential role of SORL1 in Alzheimer’s disease and MCI.54 Although South-East Asia had a larger set of plasma and CSF studies in this review, multiple countries such as Indonesia, the Philippines, Malaysia, and Sri Lanka presented scarce research.