BRCA1 and invasive breast carcinoma: 20 Maarse Maarse W W Jonasse Jonasse Y Y Ausems Ausems MG MG Schipper Schipper ME ME van Hillegersberg van Hillegersberg R R First case of invasive breast cancer following prophylactic bilateral skin sparing mastectomy in a BRCA1 mutation carrier First case of invasive breast cancer following prophylactic bilateral skin sparing mastectomy in a BRCA1 mutation carrier Eur J Surg Oncol.