Twenty-eight patients with metastatic brain tumor from renal cell carcinoma were treated at the National Cancer Hospital, Tokyo, between 1962 and March 1989. In 13 patients, the median time interval between the initial diagnosis and pulmonary metastasis was 18 months, and the interval between pulmonary metastasis and brain metastasis was 13 months. In 10 patients, whose initial diagnosis was ... [Show full abstract] pulmonary metastasis, the median interval between pulmonary metastasis and brain metastasis was also 13 months. There were 2 patients who presented brain metastasis initially. The median survival time from the diagnosis of brain metastasis was 17 months for the patients whose brain tumors were surgically resected, but only 4 months for the patients who didn't receive surgery. The median survival time of the patients who received postoperative radiation was 20 months, while it was 10.5 months for the patients who received radiation therapy alone. Repeated serial CT scans of 7 patients with measurable brain metastases revealed partial response (PR) to radiotherapy in 2 patients (28.6%), no change (NC) in 4 patients (57.2%), and progressive disease (PD) in one patient (14.3%). BrdU labeling indices of resected brain metastases were about 2%, and the doubling time calculated on repeated serial CT scans was about 20 days. As these lesions are rather resistant to radiotherapy and grow relatively slowly they should be resected as much as possible.