Phase 2 study of tasocitinib for the treatment of plaque psoriasis

Pfizer announced results from its Phase 2 trial of tasocitinib for the treatment of adult patients with moderate-to-severe plaque psoriasis. This double-blind, placebo-controlled, dose-ranging study was conducted in 197 patients, who were randomized to receive 2, 5 or 15mg tasocitinib or placebo twice daily.   This trial met its primary endpoint of a statistically significant greater proportion of patients achieving at least a 75% reduction from baseline in PASI (Psoriasis Area and Severity Index) at week 12 in individuals with chronic moderate-to-severe plaque psoriasis. At week 12, PASI 75 responses for tasocitinib 2, 5 and 15mg twice daily groups were 25%, 40.8% and 66.7% respectively, versus placebo, 2% (all doses, p<0.001).  As early as week 4, treatment with 5 and 15mg twice daily of tasocitinib significantly improved patient reported health-related quality of life outcomes.

Tasocitinib is an investigational oral Janus Kinase (JAK) inhibitor.  It is believed that the JAK pathways play an important role in the psoriasis disease cascade.

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