The distributions of HER2-positive and TNBC among BM patients from BC were higher than in those of the general proportion of BC patients, which reflects predilection to BM of HER2-positive and TNBC BCs (Slimane et al. 2004; Sanna et al. 2007; Ryberg et al. 2005; Lin et al. 2008; Heitz et al. 2009; Pestalozzi et al. 2006). Here, ERBB2 is linked to breast cancer.