Concordant with this finding, Ki67 positivity by immunohistochemistry, determined in tumor cells at day 14 (Supplementary Fig. 1b), was lower in PAM50 Luminal A tumor samples compared to PAM50 non-Luminal A tumor samples (mean Ki67 of 10.8% vs. 19.8%; p = 0.009 by two-tailed unpaired t-test). The gene discussed is MKI67; the disease is neoplasm.