ERBB2 and breast cancer: The overall median percentage of ciliated cells (CK5- and CK5+ combined) in the four breast cancer subtypes was not significantly different compared to one another (median: luminal A = 0.2%, luminal B = 0.1%, Her2 = 0.5%, and Triple Negative = 0.1%; Figure 2A, Additional file 1: Table S2B).