Randomized Treatment of Brain Metastasis with Gamma Knife Radiosurgery, Whole Brain Radiotherapy or Both
Presenter: P. B. Chougule
Affiliation Rhode Island Hospital/Brown University, Providence, RI
Brain metastases develop in approximately 25% of all cancer patients. Management with whole brain RT may palliated these patients, but survival remains dismal. This report is of a group of patients randomized to either whole brain RT (WBRT), Gamma Knife Therapy (GK) or both (WBRT+GK).
- Patients were randomized to WBRT, GK or WBRT+GK, stratified by treatment site
- Outcomes were compared for survival and local control
- Patients were evenly distributed to the 3 arms; 34 for WBRT, 35 for GK+WBRT and 36 for GK
- Median survival was between 5 - 7 months, and was not different for any group
- Local control was 52% for the WBRT group, 82% for the WBRT+GK group, and 79% for the GK group (p = .0003)
- The risk of developing a new brain lesion in un-irradiated brain was significantly higher (approx 40%) in patients who received GK therapy vs approx 20% in patients treated with WBRT or WBRT + GK
- Surgically resected patients had a better outcome, seen primarily in patients who did not receive GK
- GK therapy does not impact on survival
- GK therapy results in improved local control
- The risk of developing new brain lesions in patients who do not receive WBRT is higher than those who do
- GK therapy in conjunction with whole brain RT may improve local control for some patients with brain matastases but probably does not impact survival.
- Selection of patients who underwent surgical resection may have had an impact on the outcome of this study