or metastatic sites (Met). **B.** Post-recurrent survival associated with various PR statuses in primary breast cancer (Prim) and metastatic sites (Met).  ![](oncotarget-00-00000-g000a)  ![](oncotarget-00-00000-g000b)  After adjusting for the age of patients with primary breast cancer, age of patients with metastatic breast cancer, 