CYP3A4 and neutropenia: Here, we evaluated additional SNPs on the candidate genes: CYP3A4*22, GSTP1, ERCC2, SLCO1B1, and ABCG2, but did not observe a significant relationship with neutropenia and neurotoxicity except for XRCC3 316A>G rs1799794 for GG+AG alleles (p = 0.03).