A drug used alone or with capecitabine to treat breast cancer that is locally advanced or has spread to other parts of the body and did not get better after treatment with other anticancer drugs. It is also being studied in the treatment of other types of cancer. Ixabepilone blocks cell growth by stopping cell division and may kill cancer cells. It is a type of epothilone analog and a type of antimicrotubule agent. Also called BMS-247550 and Ixempra.