Our results showed that train metastasized HER2-positive breast cancer JIMT-1 Br cells have similar growth rate compared to their parental regular breast cancer JIMT-1 cells...72 hours of AZA treatment significantly inhibited cell grow in both cell lines, and the inhibition of JIMT-1 growth is greater than that of JIMT-1 Br cells; (3) AZA triggered apoptosis in both cell lines in a dose-dependent manner; (4) Higher concentrations of AZA induced a higher percentage of cell apoptosis in JIMT-1 compared to JIMT-1 Br cells....We found that AZA inhibits cell growth and promotes apoptosis in both cell types...