An combination chemotherapy regimen consisting of docetaxel (Taxotere), doxorubicin hydrochloride (Adriamycin) and cyclophosphamide used in the adjuvant setting for the treatment of breast cancer. Or An abbreviation for a chemotherapy combination used with other types of therapy to treat breast cancer. It includes the drugs docetaxel (Taxotere), doxorubicin hydrochloride (Adriamycin), and cyclophosphamide. Also called TAC.