Prognostic Factors Following Palliative Radiotherapy in Breast Cancer Patients with Oligometastatic Disease Limited to One or Two Metastatic Lesions: A Single-Center Retrospective Study (Prognostic Factors Following Palliative Radiotherapy in Breast Cancer Patients with Oligometastatic Disease Limited to One or Two Metastatic Lesions: A Single-Center Retrospective Study) - Huriye Şenay Kızıltan -Zeynep Kerime Şanlı;;;Mehmet Halıcı | JOURNAL OF RADIATION ONCOLOGY AND PALLIATION