Radiation therapy to delay changing breast cancer medications

This trial is testing whether a focused type of radiation therapy called stereotactic body radiation therapy (SBRT) can help people with metastatic breast cancer (cancer that has spread beyond the breast) manage their disease better. Instead of switching to a new medication when cancer starts growing in just a few new spots, researchers want to see if radiation targeted at those specific areas can keep people on their current treatment longer. The study also looks at blood tests to help guide which patients might benefit most from this approach.

When breast cancer spreads, patients often have to switch to new medications when it starts progressing, which can be costly, have side effects, and may not always work. This trial is exploring whether targeting just the few areas where cancer is growing with radiation could be a better option, potentially allowing patients to stay on a treatment that was working well overall.