Figure 6. OS by treatment modality and age group in early-stage patients. (A) HRs for OS are presented by RT with or without CT versus CT only; (B) CMT versus CT only in early-stage patients; (C) RT with or without CT versus CT only in early-stage patients who received ANT-based regimens; (D) CMT versus CT only in early-stage patients who received ANT-based regimens. The solid line represents the HR estimate, and dashed lines represent 95% CIs. OS, overall survival; HR, hazard ratio; RT, radiotherapy; CT, chemotherapy; CMT, combined modality therapy; ANT, anthracycline.