Timmer M, Werner JM, Röhn G, Ortmann M, Blau T, Cramer C, Stavrinou P, Krischek B, Mallman P, Goldbrunner R. Discordance and Conversion Rates of Progesterone-, Estrogen-, and HER2/neu-Receptor Status in Primary Breast Cancer and Brain Metastasis Mainly Triggered by Hormone Therapy. Anticancer Res. 2017 09; 37(9):4859-4865.