Study to Evaluate the Safety and Efficacy of ESC-derived Dopamine Progenitor Cell Therapy in PD Patients

"Biological/Vaccine: Allogenic embryonic stem cell-derived A9 dopamine progenitor cell (A9-DPC)\_Low Dose~1. IP Name : Allogenic embryonic stem cell-derived A9 dopamine progenitor cell (A9-DPC)~2. Main ingredients and quantities: A9-DPC -Low Dose :~ 7.0X10\^6 cells (Use 3.15X10\^6 cells of this)~3. Formulation: milky white cell suspension~4. Storage method: Refrigerated storage (5±3#)~5. Expiration date: within 36 hours of manufacture~6. Frequency: single dosing~7. Method: The subject pierces a burr hole in the skull on the day of surgery. Then the cells are injected at a predetermined stem cell administration point of the putamen in the brain of the subject. One side is administered in three tracks per putamen (6 tracks total brain). Do the same for the other side."

"Biological/Vaccine: Allogenic embryonic stem cell-derived A9 dopamine progenitor cell (A9-DPC)\_High Dose~1. IP Name : Allogenic embryonic stem cell-derived A9 dopamine progenitor cell (A9-DPC)~2. Main ingredients and quantities: A9-DPC -High Dose :~ 1.4X10\^7 cells (Use 6.30X10\^6 cells of this)~3. Formulation: milky white cell suspension~4. Storage method: Refrigerated storage (5±3#)~5. Expiration date: within 36 hours of manufacture~6. Frequency: single dosing~7. Method: The subject pierces a burr hole in the skull on the day of surgery. Then the cells are injected at a predetermined stem cell administration point of the putamen in the brain of the subject. One side is administered in three tracks per putamen (6 tracks total brain). Do the same for the other side."