ABCA1 and Decreased total leukocyte count: The risk of recurrence of leukopenia in four or more cycles was increased by two independent genetic factors: ABCA1 rs4149339 common and rare homozygotes CC/TT (OR 2.66; 0.14–0.95; p = 0.04) and DPYD rs291583 homozygote GG (OR 2.80; 1.26–6.19; p = 0.011) (Table 2).