Doxorubicin is a chemotherapy drug that is designed to stop the growth of cancer cells, which may cause the cells to die. Liposomal doxorubicin is a redesigned version of doxorubicin. The drug, doxorubicin, is enclosed in a fat bubble called a liposome. This is designed to allow the drug to get into the tumor tissue better and to stay in the body for a longer time.