RESUMO
BACKGROUND: Psoriasis is a chronic, recurrent skin disease that affects approximately 2-3% of the world's population, and can significantly impair patients' wellbeing and their physical and mental functioning. AIM: To systematically evaluate the efficacy and safety of ustekinumab versus placebo for psoriasis. METHODS: We performed a systematic review of all the relevant published literature relating to randomized controlled trials (RCTs) of ustekinumab from 1990 to August 2013. Relative ratios (RRs) and 95% confidence intervals (CIs) were calculated, and meta-analysis was conducted with Revman5.2.6 software, while GRADE Profile 3.6 was used to evaluate the quality of the evidence. RESULTS: In total, 9 RCTs involving 11 381 patients were included. The meta-analysis results were as follows. (i) At the end of 12 weeks, the ustekinumab group had a larger number of patients with improvement in Psoriasis Area and Severity Index (PASI) of at least 50% (PASI50), at least 75% (PASI75) and at least 90% (PASI90); a larger number with improvement in Physician's Global Assessment (PGA), and a larger number with improvement in Dermatology Life Quality Index (DLQI) to a score of 0 or 1 (no effect at all on patient's life). (ii) There was no significant difference in efficacy between 45 mg and 90 mg ustekinumab at the end of 12 weeks. (iii) There was no obvious difference between the ustekinumab and placebo groups in the incidence of adverse events over 5 years. There was also no obvious difference between the two doses of ustekinumab after 5 years. CONCLUSION: Our results indicate that ustekinumab is safe for patients with moderate to severe plaque psoriasis over a period of 5 years, and it is effective after 12 weeks. There was no significant superiority in efficacy between the 45 mg and 90 mg doses for short-term therapy. Results of the long-term safety evaluation are consistent with short-term reports of ustekinumab safety. More long-term studies and RCTs are needed to validate these results.