The efficacy of multiple courses of alefacept in patients with moderate to severe chronic plaque psoriasis.

Among patients with psoriasis who did not achieve Psoriasis Area and Severity Index 50 during the first course of alefacept therapy, 53% achieved Psoriasis Area and Severity Index 50 during the second course (odds ratio [95% confidence interval] vs placebo 2.30 [1.26-4.19]). Alefacept provided incremental efficacy over 5 successive 12-week treatment courses.