Confocal microscopy on FITC-labeled samples confirmed that three human cancer cell lines MCF-7 (breast cancer), Caco-2 (epithelial colorectal adenocarcinoma), and HeLa (cervical cancer), efficiently internalize CCNs−NH2-FITC-HSA and CCNs-HSA-FITC. Here, CCNL2 is linked to breast carcinoma.