AbstractMetastatic breast cancer (MBC) remains the second cause of cancer death in women, despite improvements in early breast cancer detection and treatments, with a 5-year survival of only 27%. Patients with MBC involving the liver have a 5-year survival of only 3.8 to 12%. Systemic therapy is the cornerstone for the treatment of MBC according to the National Comprehensive Cancer Network (NCCN) guidelines. Radioembolization is not specifically prescribed by the NCCN guidelines in the treatment of MBC liver metastasis, but is an emerging therapy with some promising results. The two primary reasons to offer radioembolization would be to prolong life and to palliate and improve quality of life. We review here the indications, contraindications, technique, case examples, and unanswered questions.