The efficacy of fractional carbon dioxide laser combined with narrow-band ultraviolet B phototherapy for non-segmental vitiligo: a systematic review and meta-analysis

Fractional carbon dioxide (CO 2 ) laser has been used with conventional treatments for vitiligo, demonstrating more effectiveness compared with conventional treatments alone. Especially, fractional CO 2 laser combined with narrow-band ultraviolet B (NB-UVB) was shown to induce more improvement compared with NB-UVB monotherapy for treating stable non-segmental vitiligo. However, the effectiveness of fractional CO 2 laser plus NB-UVB for the treatment of non-segmental vitiligo remains controversial. Therefore, this study aimed to confirm the safety and efficacy of fractional CO 2 laser combined with NB-UVB compared with NB-UVB monotherapy in stable non-segmental vitiligo. We searched the data from different databases, including Cochrane, Embase, and PubMed up to January 2020. Four randomized controlled trials (RCTs) for comparison between fractional CO 2 laser plus NB-UVB and NB-UVB monotherapy in patients with stable non-segmental vitiligo were included. We performed meta-analyses for repigmentation improvement and patient satisfaction as well as subgroup analyses based on acral or non-acral vitiligo, according to the PRISMA guidelines. The combination treatment showed more superior results than NB-UVB monotherapy (≥ 75% repigmentation, RR 4.60, 95% CI 1.19–17.74; ≥ 50% repigmentation, RR 2.24, 95% CI 0.45–11.17;