1. Drug combination: EC-T scheme includes two drugs, cyclophosphamide and paclitaxel; The AC-T regimen is adriamycin, cyclophosphamide and paclitaxel.

2. Treatment sequence: The EC-T regimen is generally treated with cyclophosphamide first, and then with paclitaxel, which usually takes several cycles; The AC-T regimen is treated with adriamycin and cyclophosphamide first, and then with paclitaxel, which will also go through multiple cycles.