CPC death and growth. A–C, DOXO administration enhances apoptosis (A: TdT, white), senescence (B: p16INK4a, yellow) and decreases proliferation (C: Ki67, yellow) of CPCs (c-kit, green) in vivo at 3 and 6 weeks after the first injection of anthracycline. D, Oxidative damage (8-OH-dG, magenta) in CPCs increases after DOXO treatment in vivo. E, Number of functionally competent CPCs in control and DOXO-treated rats at 3 and 6 weeks. *,** P< 0.05 vs. C and 3 wks, respectively.