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Objective: The aim of this study was to investigate the side effects of docetaxel with cyclophosphamide as postoperative adjuvant chemotherapy for elderly breast cancer patients. Methods: Thirty-six operable elderly breast cancer patients at intermediate risk based on the St Gallen risk classi.cation underwent modified radical mastectomy and then were given four cycles of TC regimen (docetaxel 75 mg/m2 i.v. on day 1; cyclophosphamide 600 mg/m2 i.v. on day 1; every 21 days ). Primary prophylaxis granulocyte colony stimulating factor (G-CSF) 200μg i.h. was administered on day 4-6. Results: The main side effect was neutropenia. Grade 3 neutropenia developed in 36.1% and G4 in 19.4%, respectively. Most of the other side effects were G1-2. Dose reduction occurred in 11.1% patients. The completion rate of chemotherapy was 100%. Conclusion:Docetaxel with cyclophosphamide as postoperative adjuvant chemotherapy regimen with G-CSF primary prophylaxis is tolerable for elderly patients in general good condition.