Beta Carotene Treatment and Erythrocytic Protoporphyrin Levels
Abstract
Abstract To the Editor.— To determine if long-term beta carotene therapy of erythropoietic protoporphyria (EPP) had any effect on protoporphyrin levels, we have performed statistical analyses of all of the erythrocytic protoporphyrin concentrations of 44 patients with EPP who had participated for at least two years in our study of beta carotene therapy of this disease.1,2 For each patient, the data included protoporphyrin concentrations that were determined when patients were and were...