The AUC of the NUDT15 haplotype was significantly better to predict leukopenia (WBC < 3000/μL) than the model of NUDT15 codon 139 only (AUC = 0.706 and 0.722, p = 0.013, respectively) (Table 4, Supplementary Fig. S6). Here, NUDT15 is linked to Decreased total leukocyte count.