SUVmax at baseline was higher in tumors with stage IIIA (p < 0.01), a diameter ≥ 2 cm (p < 0.01), lymph node involvement (p < 0.01), HR-negative status (p = 0.032), higher HER2 protein expression (p < 0.01), increased Ki67 proliferation index (p = 0.01), higher histological grade (p < 0.01), and ductal carcinoma type (p = 0.013) (Fig. 2). Here, MKI67 is linked to breast ductal adenocarcinoma.