GSTP1 and pachyonychia congenita: The least prevalent haplotype was GSTP1*D in patients (8%) and in controls (2%), consisting of a referent allele in GSTP1 rs1695 (GSTP1*Ile) and variant GSTP1 rs1138272 allele (GSTP1*Val). Nevertheless, individuals with this haplotype were at an approximately 2.5–fold higher risk of developing PC when compared to the GSTP1*A haplotype (OR = 2.40, 95%CI = 1.08-5.34, p = 0.033) (Table 3).