MKI67 and neoplasm: AWBI was not inferior to CWBI with respect to the risk of IBTR in both the patient subgroups, i.e., those with favorable as well as adverse factors, such as age < 50 years (HR 0.60, 95% CI: 0.11-3.30), high tumor grade (HR = 0.77, 95% CI: 0.18-3.25), non-luminal subtype (HR = 0.90, 95% CI: 0.15-5.42), and Ki-67 index ≥ 14% (HR 0.50, 95% CI: 0.08-3.11).