Postoperative radiotherapy for stage IV breast cancer following primary tumor removal: Systematic review and meta-analysis
De novo metastatic breast cancer (dnMBC) is diagnosed when breast cancer has spread at presentation and accounts for 5–10% of cases. The benefit of postoperative radiotherapy (PORT) after primary tumor surgery in this setting remains uncertain.
We conducted a review and meta-analysis of observational studies published between 2013 and 2024. Two databases (PubMed and Embase) were searched and the review followed PRISMA 2020 guidelines.

