The presence of tumor cells in these samples was confirmed by qPCR analysis of the ovarian cancer marker genes MUC16 and HE4 (Figure S4), while five of the nineteen cell samples were additionally analyzed for cell surface expression of mucin-16 and epithelial cell adhesion molecule (EpCAM) by flow cytometry (Figure S5; Table S4). Here, EPCAM is linked to ovarian cancer.