[Treatment policies with active intention on radiation therapy in brain tumors and tolerance dose of the nervous system].

For the treatment of brain tumors, radiation tolerance on the central nervous tissues is one of the most serious limiting factor, because glioblastoma has been considered as radioresistant. Radiation therapy in commonly employed dosages for malignant gliomas carries a risk of injury to surrounding cerebral tissues. Therefore, precision radiation therapy concerning that radiation field co-inside with the tumorous lesion is essentially important to intend obtaining an improvement of the local control rate without delayed radiation injuries. In this paper, a review of literatures as for radiation tolerance on the central nervous system and treatment policies with active intention for brain tumors are discussed.