A randomized, double-blinded, vehicle-controlled clinical trial of topical cryosim-1, a synthetic TRPM8 agonist, in prurigo nodularis

BackgroundPrurigo nodularis (PN) is an intensively pruritic skin disease that negatively influences quality of life. Cryosim-1 (Intrinsic IB Spot) is a synthetic, selective transient receptor potential melastatin 8 agonist.AimsTo investigate the efficacy and safety of cryosim-1 in PN patients.Patients/MethodsA randomized, double-blinded, placebo-controlled clinical trial including 30 patients was conducted. The numerical rating scale (NRS) of pruritus was evaluated before and 2 h after cryosim-1 application at every visit.ResultsAt week 8, the mean pruritus NRS before serum application (4.7 +/- 0.4 treatment, 6.1 +/- 0.5 placebo; p = 0.045) and 2 h after serum application (2.8 +/- 0.4 treatment, 4.3 +/- 0.5 placebo; p = 0.031) were significantly lower in the treatment group, and the mean NRS for sleep disorder was significantly lower in the treatment group (2.2 +/- 0.5 treatment, 4.2 +/- 0.8 placebo; p = 0.031). The mean satisfaction scales for pruritus improvement were significantly higher in the treatment group (7.2 +/- 0.6) than in the placebo group (4.0 +/- 0.9; p = 0.005). There was no difference in TEWL between the two groups, and no adverse reactions were reported.ConclusionsCryosim-1 is a safe and effective topical treatment for PN patients.