Variable effects of beta-carotene therapy in a child with erythropoietic protoporphyria.

摘要

Erythropoietic protoporphyria (EPP) is an inborn error of heme biosynthesis with high levels of protoporphyrin in red cells and is characterized by mild to moderate photosensitivity. High-dose beta-carotene therapy has been reported to afford photoprotection in patients with EPP. We report the case of a 5-year-old Caucasian female with EPP who presented with a long-standing 3-year history of recurrent facial blisters and erythematous swelling and lesions of other sun-exposed areas of the skin. She was treated with a topical sunblocker (PreSun Ultra-SP45) but continued to show moderate to severe photosensitivity despite 3 months (March to May) of vigorous photoprotection. She was then started on increasing doses of beta-carotene (90-180 mg/day) over a period of 3 months (June to September) which resulted in a marked improvement of both facial and forearm lesions, but only modest improvement in her hand lesions. CONCLUSION: High-dose beta-carotene appears to provide photoprotection in erythropoietic protoporphyria, resulting in improved but highly variable tolerance to sunlight.