NEW YORK (Reuters Health)—The selective interleukin-17A inhibitor ixekizumab improved signs and symptoms of active psoriatic arthritis (PsA) in patients who had failed prior biologic therapy in the phase 3 SPIRIT-P2 trial. The SPIRIT-P2 trial joins the earlier phase 3 SPIRIT-P1 trial, which showed that ixekizumab was safe and effective in PsA patients not previously treated…