The correlation of two famous markers, CK and vimentin, in breast cancer and their significance for patient outcome was described by Polioudaki et al. They used blood samples from metastatic breast cancer patients and breast cancer cell lines to calculate the ratio of CK/vimentin, but especially in the patient samples CK/vimentin ratios varied a lot, displaying again the heterogeneity of CTCs undergoing EMT [90]. Here, VIM is linked to breast cancer.