*5.1.3 Olfactory ensheathing cells*

Transplants with autologous OECs in three patients indicated that there were no adverse effects 1 year after transplantation. The neurosurgical process did not lead to any negative sequelae either during the operation or postoperatively. Additionally, they demonstrated the possibility of taking a nasal biopsy and reliably generating enough cells for transplantation within 4 weeks [161]. These observations suggest that autologous transplantation is safe but further researches are needed.
