These results show that ERCC2 rs1799793 A/A genotype was associated with anemia in a recessive model of inheritance, ERCC2 rs13181 T/G and CYP3A4 rs2740574 A/G genotypes were associated with alopecia in a codominant model of inheritance, and ERCC2 rs238406 A/A genotype was associated with leukopenia, both in codominant and recessive models of inheritance. This evidence concerns the gene CYP3A4 and alopecia.