Within the low risk groups, no significant difference was found between PTCH1 positive and negative expression groups in terms of mean age (P-value=0.33), sex (P-value =0.23), or BCC subtype (Levene P-value=0.26, F(2,58)=0.29 with P-value=0.75). This evidence concerns the gene PTCH1 and skin basal cell carcinoma.