Figure 2From: CYP1A2*1F and GSTM1 Alleles Are Associated with Susceptibility to Porphyria Cutanea TardaCYP1A2*1F genotype frequencies in PCT patients and matched controls under a model where A is recessive. The frequency of the A/A genotype in comparison with the C/A and C/C genotypes was significantly higher in PCT than in controls (Fisher exact test, P < 0.028).Back to article page