Clinical features of genetic cutaneous porphyrias in Israel: A nationwide survey.

BACKGROUND: There are three major types of genetic cutaneous porphyrias (GCP): erythropoietic protoporphyria (EPP), variegate porphyria (VP), and hereditary coproporphyria (HCP). Scarce data are available regarding their impact on patients' quality of life in the Mediterranean region.

PURPOSE: To describe the cutaneous features of GCP in Israel.

METHODS: An established nationwide cohort of patients with GCP diagnosed during 1988-2019 was surveyed by telephone for cutaneous features of GCP. Impact on quality of life was assessed using the Dermatology Life Quality Index.

RESULTS: Of the 95 patients with GCP, 71 (75%) completed the survey (21 HCP; 40 VP; 10 EPP). All EPP patients reported cutaneous symptoms compared with 58% of VP and 5% of HCP (P < .001). Mean age at symptom onset was 7 ± 6 years in EPP and 25 ± 15 years in VP (P < .001). Photosensitivity was the most common symptom in EPP (90%). In VP photosensitivity (52%), blistering (52%) and scarring (74%) were all common symptoms. In both VP and EPP, the dorsal hands/forearms were the most affected regions (≥96%), and in ≥ 78%, symptoms occurred on an almost daily basis. All EPP patients changed their lifestyle due to cutaneous symptoms vs 57% in VP. Major effect on quality of life was observed among EPP patients compared with a moderate effect in VP. No treatment was effective in EPP, while phototherapy and moisturizers were effective in 5 of 7 (71%) VP patients.

CONCLUSION: This study sheds light on the cutaneous features of the GCP, which have a substantial effect on patients' quality of life.