c-Myc drives proliferation in metastatic breast cancer cell subclones. (A) IB for c-Myc from whole-cell extracts of parental and metastatic subclones. (B) Proliferation of parental cells and metastatic subclones over 3 days (mean ± SD, n = 3). (C) 3 day proliferation of 231-Parental, 831-BrM, 1833-BoM, and 4175-LM cells expressing either a nontargeting (shNT) or c-Myc targeting (shMyc) vectors. (mean ± SD, n = 3).