224-OR: The Efficacy and Safety of HSK 16149 in Chinese with Diabetic Peripheral Neuropathic Pain—A Randomized, Double-Blinded, Placebo and Pregabalin-Controlled Phase II/III Study

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Background: Chronic diabetic peripheral neuropathic pain (DPNP) is common and difficult to treat. The recommended medications are either inadequate effective or limited by the side effects. This study aims to evaluate the efficacy and safety of HSK16149, a potent, selective ligand of the a2δ subunit of voltage-gated calcium channels (VGCC), as analgesia treatment for DPNP. Materials and Methods: This was a randomized, double-blind, placebo and active-controlled phase II/III study of patients aged ≥18 years with diabetic peripheral neuropathy in China. Firstly, the patients with moderate to severe pain were randomized to receive placebo, HSK 16149 40,80 mg/d without titration, and HSK16149 120, 160mg/d, pregabalin 300mg/d with 1 week titration on average. Then more patients were recruited and randomized to placebo and two HSK16149 dose groups, continued the treatment for up to 13 weeks. The primary endpoint was the change from baseline in average daily pain score (ADPS) at week 13. The secondary endpoint was the responder rates as ≥30% and ≥50% improvement in ADPS. Results: Compared with placebo, the pain was reduced since week 1 in HSK16149 groups. At week 13, the mean ADPS change from baseline was -1.23, -2.24 and -2.16 for placebo (n=177), HSK 16149 40mg/d (n=178) and 80mg/d (n=179), showing statistical significance for both HSK groups versus placebo (P<0.0001). The 30% and 50% responder rate were both significantly greater for two HSK groups versus placebo (≥30%: 57.3%, 51.4% versus 31.6%; ≥50%: 32.0%, 36.3% versus 18.1%) at week 13. Most treatment-emergent adverse events (TEAE) in HSK16149 groups were mild to moderate, and the most frequent TEAEs were dizziness and somnolence, which were always transient and needed no additional treatment. Conclusions: HSK 16149 rapidly improved analgesia without titration and was efficacious in relieving pain in Chinese DPNP patients, and well tolerated. Disclosure X.Guo: None. T.Zhang: None. G.Yuan: None. L.Yukun: None. J.Ma: None. L.Hong-mei: None.