Double attack on tough breast cancer: radiation and immune drug tested for brain spread

This study is testing whether combining a targeted radiation procedure (stereotactic radiosurgery) with an immunotherapy drug (atezolizumab) works better than either treatment alone for triple-negative breast cancer that has spread to the brain. The goal is to see if the radiation damages the cancer cells and makes them more visible to the immune system, which the drug then helps attack. Researchers will measure how long patients go without their cancer getting worse and check the safety of this combination approach.