Assessment system based on the genotyping of patients allowed to correctly classify 69.2% of patients with severe neutropenia and 75.7% of patients without this adverse effect to the appropriate categories, confirming that the SNPs in ABCC2 and SLCO1B3 genes may be a predictive factor for docetaxel induced neutropenia. Here, SLCO1B3 is linked to Decreased total neutrophil count.