<qa>  What is the most commonly used chemotherapy regimen for breast cancer?Anthracycline-based chemotherapy is standard in the treatment of breast cancer with doxorubicin being the most frequently used agent in this group. Currently the most commonly used chemotherapy regimens for breast cancer include: doxorubicincyclophosphamide AC fluorouracildoxorubicincyclophosphamide FAC cyclophosphamidemethotrexatefluorouracil CMF docetaxeldoxorubicincyclophosphamide TAC fluorouracilepirubicincyclophosphamide FEC single agent taxanes paclitaxel and docetaxel Except for the taxanes, these agents are known to cause significant nausea and vomiting after administration. 