ATR and breast cancer: First, GNPDA1 was strongly associated with “DNA damage_ATM activation by DNA damage (p = 4.282 × 10−06)”, “BRCA1 and BRCA2 in breast cancer (p = 6.950 × 10−04)”, and “DNA damage_ATM/ATR regulation of G2/M checkpoint: nuclear signaling (p = 8.093 × 10−04)” (Figure 5A).