Background The expression of HER2 estrogen (ER) and progesterone (PR) receptor can change during the course of the disease in breast cancer (BC). BC from seven University BC Centers in Germany were enrolled in this study. Blood was obtained at…
Background The expression of HER2 estrogen (ER) and progesterone (PR) receptor can change during the course of the disease in breast cancer (BC). BC from seven University BC Centers in Germany were enrolled in this study. Blood was obtained at…