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Researchers at the American Society for Clinical Oncology (ASCO) 2026 meeting reported results from the Phase 3 ROADS trial, which enrolled 230 patients with newly diagnosed brain metastases requiring surgery and randomized them to receive either GammaTile (115 patients) or standard postoperative stereotactic radiotherapy (115 patients).
GammaTile is a collagen implant containing radioactive cesium-131 seeds that is placed directly into the surgical cavity during tumor removal. Investigators reported that local recurrence occurred in just 1% of GammaTile patients, compared with 12% of patients receiving standard postoperative radiation.
The study also reported improvements in recurrence-free survival and overall survival, with an estimated 61.7% of GammaTile patients alive two years after diagnosis, compared with 35.7% in the control group. Importantly, these benefits were achieved without an increase in serious treatment-related side effects.