Efficacy, Safety, and Tolerability of ONO-4474, an Orally Available Pan-Tropomyosin Receptor Kinase Inhibitor, in Japanese Patients With Moderate to Severe Osteoarthritis of the Knee: A Randomized, Placebo-Controlled, Double-Blind, Parallel-Group Comparative Study.

We examined the efficacy, safety, and tolerability of ONO-4474 in Japanese patients with osteoarthritis (OA) of the knee. In this multicenter, placebo-controlled, randomized, double-blind, parallel-group comparative study, patients with moderate to severe OA who were refractory to nonsteroidal anti-inflammatory drugs were orally administered 100 mg of ONO-4474 twice daily for 28 days. The primary end point was knee pain during walking, assessed by visual analog scale over 24 hours (VAS24 ). Treatment-emergent adverse events (TEAEs) and adverse drug reactions were reported for safety. In total, 110 patients were randomized (1:1) to receive placebo or ONO-4474. The mean (standard deviation) change in VAS24 scores at week 4 was -26.9 (25.0) mm in the ONO-4474 group and -19.5 (19.6) mm in the placebo group. The difference (ONO-4474 group - placebo group) in posterior mean change in VAS24 at week 4 was -5.8 (posterior standard deviation, 4.4; 95% confidence interval, -14.3 to 2.8) mm. TEAEs were reported in 41.8% of patients in the ONO-4474 group and 18.2% of patients in the placebo group. The most common TEAEs in the ONO-4474 group related to the musculoskeletal system and the peripheral and central nervous systems were myalgia (7.3%), arthralgia (5.5%), dizziness (3.6%), and hypoesthesia (3.6%). Four patients from the ONO-4474 group and 1 patient from the placebo group discontinued treatment because of AEs; however, none were judged to be serious, and all patients recovered or were recovering after discontinuation. ONO-4474 is a novel tropomyosin receptor kinase inhibitor that has an analgesic effect in patients with OA.