Figure 1From: CYP1A2*1F and GSTM1 Alleles Are Associated with Susceptibility to Porphyria Cutanea TardaCYP1A2*1F promoter A allele and genotype frequencies in PCT cases and matched controls. Allele frequency (Panel A) was significantly higher in PCT patients than in controls (Fisher exact test, P < 0.022). The higher A/A genotype frequency in PCT patients (Panel B) was marginally significant (likelihood ratio chi-square, P < 0.057).Back to article page