<p>The Supplementary Figures and Legends provide additional information on Flow Cytometry gating strategy for TNBC CSC sorting, the effects of C1572 on additional TNBC cells, the evidence that C1572 reversibly inhibits MYC, comparing the effectiveness of C1572 and JQ1 at inhibiting MYC, and the impact of C1572 on body weight change in mice.</p>