A form of the anticancer drug doxorubicin citrate that is contained inside very tiny, fat-like particles. It is being studied in the treatment of breast cancer that has spread and in the treatment of other types of cancer. Doxorubicin citrate damages DNA and may kill cancer cells. Liposomal-encapsulated doxorubicin citrate may have fewer side effects and may work better than doxorubicin citrate.