KRT7 and neoplasm: Immunohistochemistry exhibited positive expression of CK7 (Fig. 7A1–C1 and Supplementary Fig. 1A), CK19 (Fig. 7A2–C2 and Supplementary Fig. 1B), E-cadherin (Fig. 7A4–C4 and Supplementary Fig. 1D) and Vimentin (Fig. 7A5–C5 and Supplementary Fig. 1E) in cell lines, transplanted tumours and primary tumours.