Comparison of efficacy and safety profile of topical calcipotriol ointment in combination with NB-UVB vs. NB-UVB alone in the treatment of vitiligo: a 24-week prospective right-left comparative clinical trial.

BACKGROUND: Narrow-band ultraviolet B (NB-UVB) is an effective and safe treatment for vitiligo. Calcipotriol, a synthetic analogue of 1,25 dihydroxyvitamin D3 may regulate melanin synthesis. Several clinical studies have been conducted but the synergistic effect of addition of calcipotriol to NB-UVB in the treatment of vitiligo is still debatable. OBJECTIVES: To compare the efficacy and safety of topical calcipotriol (0.005%) in combination with NB-UVB vs. NB-UVB alone in generalized vitiligo. METHODS: A prospective right-left comparative study including 27 patients of vitiligo was conducted for 24 weeks. On one side, calcipotriol was applied twice a day. NB-UVB was administered thrice a week. Response to treatment was assessed using change in Lund and Browder (L&B) score for percentage reduction in body surface area, investigator's global assessment (IGA) and patient's global assessment (PGA) scores. Treatment related side effects were noted. RESULTS: Mean percentage reduction in L&B score at 24 weeks was 51.4% on NB-UVB and 49% on NB-UVB plus calcipotriol side (P = 0.557), mean IGA score on NB-UVB was 2.7 ± 0.5 and on NB-UVB plus calcipotriol was 2.6 ± 0.4 (P = 0.821) and mean PGA score on NB-UVB side was 5.6 ± 3.4 and on NB-UVB plus calcipotriol side was 5.8 ± 3.2 (P = 0.706). Perifollicular repigmentation that matched with the surrounding normal skin colour was seen in majority of patients on both treatment sides. Calcipotriol produced mild local adverse effects. CONCLUSIONS: Addition of calcipotriol to NB-UVB probably does not enhance the efficacy of treatment including extent of repigmentation and time to initial repigmentation. Larger, randomized placebo-controlled trials are required to determine whether addition of calcipotriol has any utility when administered with NB-UVB in the treatment of vitiligo.