ATM and neoplasm: The breast tumor cells with a higher level of oxidized ATM (e.g. cases 5 and 7) (Supplementary Fig. S1D) had a stronger CSC sphere formation potential than the case with a lower level of oxidized ATM (e.g. cases 1 and 2) (Supplementary Fig. S1D), and KU60019 tended to impede the CSC sphere formation derived from oxidized ATM higher tumor than that lower tumor in normoxia (Fig. 2d, e).