MKI67 and breast cancer: In the groups receiving anthracycline-based and platinum-based treatment, respectively, the patients’ mean age at the time of first diagnosis of BC was 48.3 years (SD 9.6) vs. 50.3 years (SD 12.1); 81.8% vs. 84.8% had histological grade 3; 76.4% vs. 78.8% had Ki-67 ≥ 36%; and 63.6% vs. 59.1% had tumor sizes > 2 cm.