Significant inverse linear correlation has been evidenced in ERα-positive BC cell lines for the sensitivity to OU and fulvestrant (Figure 6A; see also Supplementary Table S6) or OU and letrozole (Figure 6C; see also Supplementary Table S6) while the direct significant correlation was found in the sensitivity of ERα-positive BC cell lines between OU and gefitinib (Figure 6G; see also Supplementary Table S6). The gene discussed is ESR1; the disease is breast cancer.