A method is described to treat tauopathies by extracorporeally treating a patient's cerebrospinal fluid (CSF). The method includes introducing an antibody into the CSF that is targeted to an antigen associated with tauopathies. The antibody can include an albumin moiety, and targets the removal of antigens such as tau protein, phosphorylated tau (pTau) protein, Ubiquitin and PKN. The antibody-antigen complex can be removed from the CSF and the CSF can be returned to the patient.
