Immunohistochemical staining of vimentin (VIM), CD45, and cytokeratin-7 (CK7) was also performed on tumor tissues from metastatic (Supplementary Figure S3F) and primary (Supplementary Figure S3G) tumors belonging to different ovarian cancer histotypes to investigate the fractions of the major cell lineages in these tumors. This evidence concerns the gene KRT7 and ovarian carcinoma.