Cerebrospinal fluid apolipoprotein E (apoE) levels in Alzheimer's disease patients are increased at follow up and show a correlation with levels of tau protein - Lindh,M.; Blomber,M.; Jensen,M.; Basun,H.; Lannfelt,L.; Engvall,B.; Scharnagel,H.; Marz,W.; Wahlund,L.O.; Cowburn,R.F. (Neurosci Lett, 1997)