Five-year OS of postoperative breast cancer patients. (A) Five-year OS of different subgroup of NLN count (0–9 and ≥10); (B) 5-year OS of different subgroup of LNR (0–20.0%, 20.1–65.0%, 65.1–100%); (C) 5-year OS of 204 breast cancer patients with 0–9 NLN count according to subgroups of LNR (0–20.0%, 20.1–65.0%, 65.1–100%); (D) 5-year OS of 725 breast cancer patients with NLN count ≥10 according to subgroups of LNR (0–20.0%, 20.1–65.0%, 65.1–100%). OS, overall survival; LNR, lymph node ratio; NLN, negative lymph node.