HMOX1 and vitiligo: However, there was no evidence that the allele and genotype frequencies of Nrf2 rs6721961 G/T and HO‐1 rs2071746 A/T were associated with susceptibility to vitiligo (P = 0.447 for Nrf2 rs6721961; P = 0.124 for HO‐1 rs2071746).