ERBB2 and breast cancer: In vitro cellular uptake, a study was also conducted for tamoxifen citrate loaded nanoliposomes conjugated with antibody (FITC anti-human CD 340 (erbB2/HER-2)) in MCF-7 and MDA-MB-453 breast cancer cells at different concentrations, such as 50 and 100 μg/mL for 1 and 2 h, respectively.