Figure 3From: CYP1A2*1F and GSTM1 Alleles Are Associated with Susceptibility to Porphyria Cutanea TardaCYP1A2*1F genotype frequencies in PCT patients with and without UROD mutations (types 1 and 2 respectively). 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 type 1 than type 2 cases (Fisher exact test, P < 0.082; likelihood ratio chi-square, P < 0.043).Back to article page