LOW-DOSE RATE TELECOBALT-THERAPY AS A BOOST AGAINST BRAIN-TUMORS

We applied low-dose rate telecobalt therapy (LDRT) as a boost for 26 b rain tumors (17 malignant gliomas, 4 pontine gliomas and 5 others). El even of those cases were recurrent. The LDRT; 1 Gy per hour, 7 Gy per day, a total dose of 14 Gy in two successive days, was boosted after a conventional irradiation. In malignant glioma, the local control rate and the survival rate were not improved, compared with those of the c ontrol group. The treatment results of other brain tumors were also un satisfactory. The incidence of brain necrosis was higher in the LDRT g roup. The benefits of the LDRT as a boost for radioresistant brain tum ors seem to be small.