UGT1A1 haplotypes were analyzed by Sakar Wahby et al. [36] in the complete sample of 343 patients and showed grade 4 neutropenia in different haplotypes: 26% incidence in homozygotes, 13% in heterozygotes, and 11% in the wild type. This evidence concerns the gene UGT1A1 and Decreased total neutrophil count.