**7.3. Stem cell implantation**

Mesenchymal stem cell implantation may reduce the cognitive impairment by two mecha‐ nisms: First, reversal of inflammatory process, as implanted mesenchymal stem cells can migrate to the site of damaged brain tissue and then release growth factors, [125]. Second, human mesenchymal stem cells can differentiate into neurons in the hippemocampal area and prevent radiation-induced late cognitive impairment [126].
