[Clinical research of radiotherapy in brain metastasis]

One hundred and four patients with brain metastasis were received the conventional radiotherapy from 1980 to 1985 at 3 hospitals. Results were as follows. 1. Primary sites were lung (41 cases), breast (34) and others (29). 2. Tumor was 3.15 cm in mean size (0.6-8.2 cm) and 2.6 in number of average (1-15) 3. Radiation dose was 46.5 Gy in average (30-66 Gy) and almost of all cases were irradiated with whole brain field. 4. Over all response rate on CT findings was 65.4% (CR rate: 23.1%) and 63.4% for lung and 73.5% for breast cancer. 5. Survival rate were 25.5% in 1 year, 8.8% in 2 year, 5.4% in 3 year and 3.6% in 5 year. 6. The longer interval was between onset of brain metastasis and primary treatment, the longer survival after brain irradiation. 7. No significant differences of survival rate were seen in size and in number of brain metastasis and with on without improvement of neurological symptoms. 8. The better response was on CT, the better prognosis after radiotherapy. 9. Identification of treatment for brain metastasis according to patient's characteristics and tumor factors were important.