[Long-term effects of PUVA therapy on Israeli patients with vitiligo]

Long-term treatment of psoriasis patients with PUVA (psoralen and ultraviolet A) is associated with an increased risk of photoaging and non-melanomic skin cancer, and perhaps of melanoma as well. Very little information is available on the long-term effects of PUVA treatment on vitiligo patients in general, and specifically on the risk of developing skin tumors. Among vitiligo patients treated with PUVA or heliotherapy, only a few cases of squamous cell carcinoma (SCC) have been described.

The objective of this research is to examine the long-term effects of PUVA treatment among vitiligo patients and the incidence of long-term side effects, including various types of skin cancers.

The medical files of all patients treated with PUVA at the Rabin Medical Center and the Emek Medical Center between 1982 and 1996 were surveyed. Each patient was interviewed by telephone and then invited to come in for a medical examination.

A total of 28 out of 31 patients completed the questionnaire, and 12 of them were also examined. The average age of the patients was 47 years (range 25-84). The average amount of radiation to which each patient was exposed was 546.8 J/cm2 (range 26.5-1561), with a median of 336.8 J/cm2. The average number of treatments per patient was 84.2 (median 77). The average time that elapsed since beginning the treatment was 11 years (range 7-20), and the average time since treatment ended was 9.4 years (range 2-23). Partial or total repigmentation was experienced by 60% of the patients. In 18% of the patients, total or almost total repigmentation was seen, which lasted an average of 46 months. No skin cancer of any kind was seen in any of the patients.

A recurrence of the illness was seen in all the vitiligo patients who had responded to PUVA treatment. Long-term treatment with PUVA for vitiligo patients does not entail photoaging damages or increased risk of skin cancer.