CDC7 and breast cancer: We thank Dr Peter Cherepanov (the University of Imperial College London, St Mary's Campus) for pEGFP-C2-CDC7 and pcDNA3.1-Flag-CDC7 constructs, Dr Yong-Feng Shang (Peking University HSC, Beijing, China) for human breast cancer MCF7, MDA-MB-231 cells and for pcDNA3.1-p53 constructs.