NUCLEOLIN and ovarian cancer: Overall, upon a certain level of surface nucleolin expression as determined by flow cytometry, the results herein generated pointed towards a transversal role of nucleolin in the internalization of F3 peptide-targeted pegylated pH-sensitive liposomes into bulk ovarian cancer cells, including putative CSC-enriched ovarian SKOV-3 and OVCAR-3 cells (EpCAMhigh/CD44high).