Phase 1 clinical trials of a selective Rho kinase inhibitor, K-115.

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Tanihara H, Inoue T, Yamamoto T, Kuwayama Y, Abe H, Araie M

Phase 1 clinical trials of a selective Rho kinase inhibitor, K-115.

JAMA Ophthalmol. 2013 Oct;131(10):1288-95. doi: 10.1001/jamaophthalmol.2013.323.

PubMed ID
23787820 [ View in PubMed
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Abstract

IMPORTANCE: We conducted a series of phase 1 clinical trials to elucidate the efficacy and safety of the selective Rho kinase inhibitor K-115 as a candidate drug for the treatment of glaucoma. We report the intraocular pressure (IOP)-lowering effects and safety of K-115 based on our results. OBJECTIVE: To study the IOP-lowering effects and safety of topical administration of a selective Rho kinase inhibitor, K-115, in healthy male adult volunteers. DESIGN AND SETTING: Randomized, placebo-controlled, double-masked, group comparison phase 1 clinical trial. PARTICIPANTS: In the initial single-instillation trial, 50 healthy volunteers were subdivided into groups and treated with placebo or K-115 in concentrations of 0.05%, 0.1%, 0.2%, 0.4%, and 0.8% in a stepwise manner. In the repeated-instillation trial, another 50 healthy volunteers were subdivided into groups and treated with placebo or K-115 in concentrations of 0.05%, 0.1%, 0.2%, 0.4%, and 0.8% twice daily for 7 days in a stepwise manner. MAIN OUTCOMES AND MEASURES: In these clinical trials, the administration of eyedrops and associated examinations (including IOP measurements) were performed in a double-masked manner. RESULTS: After single instillation of placebo or K-115 in concentrations of 0.05%, 0.1%, 0.2%, 0.4%, and 0.8%, the changes in IOP from baseline were -1.6 mm Hg for placebo and -3.4, -2.2, -2.6, -4.0, and -4.3 mm Hg, respectively, for the different concentrations 2 hours after instillation. Similar to the single-instillation trial, IOP reductions in the repeated-instillation trial were found after each instillation, with maximal reduction 1 to 2 hours after instillation. In the safety trial, slight to mild conjunctival hyperemia was found in more than half of the participants treated with K-115; it was found after each instillation and spontaneously resolved within 1(1/2) hours. CONCLUSIONS AND RELEVANCE: K-115 is a promising drug for lowering IOP in healthy adult eyes, with tolerable adverse events during at least short-term administration.

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