NEW YORK (Reuters Health)—The oral Janus kinase inhibitor tofacitinib (Xeljanz, Pfizer) shows long-term efficacy against chronic plaque psoriasis, according to findings from two randomized studies and an extension trial. The outcome, Dr. Svitlana Tatulych told Reuters Health by email, “demonstrated that oral tofacitinib, at both the 10 mg and 5 mg twice-daily doses, provided sustained…