In OE cases, the rate of Ki67 + cells ranged from 5.55%/× 200 to 3.14%/× 200, and in the EPP group, the rate of Ki67 + cells ranged from 4.11%/× 200 to 1.24%/× 200. Here, MKI67 is linked to autosomal erythropoietic protoporphyria.