PSMA Expression Assessed by PET Imaging Is a Required Biomarker for Selecting Patients for Any PSMA-Targeted Therapy.

![Figure][1] Johannes Czernin ![Figure][1] Jeremie Calais Approximately 20% of breast cancers express human epidermal growth factor receptor 2 (Erb-B2 receptor tyrosine kinase 2 [ERBB2], formerly HER2), and 70% express estrogen or progesterone receptors. All excised breast cancer