CHEK1 and breast carcinoma: Moreover, survival analysis as calculated using the Kaplan-Meier Plotter showed that low levels of CHK1 predicted better overall survival (Figure 1B, n = 1,402, logrank P = 1.3e-07) and recurrence-free survival (Figure 1C, n = 3,951, logrank P < 1e-16) in breast cancer.