• NUDT15 c.415C>T → Leukopenia/neutropenia (OR = 1.08; 95% CI = 0.11–10.65; p = 0.95)• TPMT*3C c.719A>G → Leukopenia (OR = 7.59; 95% CI = 3.16–18.21; p < 0.0001). This evidence concerns the gene TPMT and neutropenia.