ERBB2 and breast cancer: 27 Matsuo Matsuo K K Fukutomi Fukutomi T T Akashi-Tanaka Akashi-Tanaka S S Hasegawa Hasegawa T T Tsuda Tsuda H H Histological grade, p53, HER2 and hormone receptor status of synchronous bilateral breast carcinoma Histological grade, p53, HER2 and hormone receptor status of synchronous bilateral breast carcinoma Breast Cancer.