Subjects with FTD, who signed the informed consent form and meet the eligibility criteria will undergo Ommaya reservoir insertion. 2 weeks after Ommaya reservoir insertion, the subjects will be injected with 3x10^7 cells/2mL of ET-STEM to intraventricular space via an Ommaya reservoir. The injection will be repeated 3 times at 4 week intervals. The subjects will be hospitalized for 24 hours and observed for acute adverse events. 4 weeks after the 3rd injection, safety and potential efficacy will be assessed.
The primary purpose of this study is to evaluate the safety and the tolerability of 3 repeated doses of ET-STEM (Mesenchymal stem cells preconditioned with ethionamide) in patients with FTD.