Smoothed hazard for death in ethnically Chinese breast cancer patients. (a) Mastectomy alone. (b) Adjuvant chemotherapy without radiotherapy. (c) Radiotherapy without chemotherapy. (d) Both modalities. (e) Local therapy only. (f) Systemic therapy. Note that the tail of the curve was removed because of the small number of available data. Chemo, chemotherapy; RT, radiotherapy.