Decernotinib (VX-509), a selective oral Janus kinase 3 inhibitor, is currently in Phase 2b for the treatment of rheumatoid arthritis (RA).1
Explore this issueOctober 2014
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Decernotinib efficacy and safety were evaluated in a 24-week, randomized, double-blind, placebo-controlled study in 358 adults with active RA (C-reactive protein [CRP] greater than the upper limit of normal, ≥6 [of 66] swollen joints and ≥6 [of 68] tender joints) taking stable doses of methotrexate (MTX). Most patients were women with a mean age of 53 years and an average disease duration of seven years. These patients were randomized to receive placebo or decernotinib at a dose of 100 mg once daily, 150 mg once daily, 200 mg once daily or 100 mg twice daily.
At Week 24, the following percentage of decernotinib-treated patients achieved an ACR20 of 61% (100 mg daily; 150 mg daily; 200 mg daily) and 63% (100 mg BID), compared with 17% of placebo-treated patients (P<0.001 for all). Both ACR50 and ACR70 results at Week 24 were also clinically and statistically significant, as were DAS28 (CRP) <2.6, DAS28 (ESR) <2.6 and the decrease from baseline in DAS28 (CRP). Adverse events (AEs) were slightly higher in the active treatment groups compared to placebo (60% vs. 43%), with 9% of decernotinib-treated patients discontinuing treatment and 42% of placebo-treated patients discontinuing treatment. The most common AEs were headache (9%), hypercholesterolemia (5%) and diarrhea (5%). Serious infections were more common in the decernotinib-treated patients compared with placebo-treated patients (3.5% vs. 1.4%). Minor laboratory abnormalities included transaminase elevations, and decreased median lymphocyte and neutrophil counts. There were two deaths; one was due to cardiac failure in the 100 mg twice daily treatment group, and one was due to pancytopenia in a patient with pneumonia who was in the 200 mg daily treatment group.
Methotrexate subcutaneous (SubQ) auto-injector pen (Rasuvo) has been approved by the Food and Drug Administration (FDA) for managing RA, polyarticular-course juvenile idiopathic arthritis and disabling, recalcitrant psoriasis.2 It will be available in packages of one and four pens, in 10 dosage strengths, ranging in 2.5 mg increments from 7.5 mg to 30 mg.2 These strengths include: 7.5 mg/0.15 mL, 10 mg/0.20 mL, 12.5 mg/0.25 mL, 15 mg/0.30 mL, 17.5 mg/0.35 mL, 20 mg/0.40 mL, 22.5 mg/0.45 mL, 25 mg/0.50 mL, 27.5 mg/0.55 mL and 30 mg/0.60 mL.3