KRT5 and invasive ductal breast carcinoma: Results from our study showed that Cyclin A2 and Ki-67 clearly distinguished luminal A from luminal B. Also, our triple-negative tumors have many of the characteristics of basal tumors: invasive ductal carcinoma, grade 3 tumors, CK5+, Vimentin+, highly proliferative markers (increased Ki-67+ and Cyclin A2+).