Abstract
Background: Most patients with diabetic kidney disease (DKD) experience disease progression despite receiving standard care therapy. Oxidative stress is associated with DKD severity and risk of progression, but currently approved therapies do not directly attenuate the pathologic consequences of oxidative stress. GS-4997 is a once daily, oral molecule that inhibits Apoptosis Signal-regulating Kinase 1 (ASK1), which is a key mediator of the deleterious effects of oxidative stress. Methods: We describe the rationale and design of a Phase 2 placebo-controlled clinical trial investigating the effects of GS-4997 in patients with T2DM and stage 3/4 DKD receiving standard of care therapy. Approximately, 300 subjects will be randomized in a stratified manner, based on the estimated glomerular filtration rate (eGFR) and urine albumin to creatinine ratio, to one of four arms in this dose-ranging study. The primary endpoint is change in eGFR at 48 weeks, and the key secondary endpoint is change in albuminuria. Conclusion: Guided by the biology of oxidative stress signaling through ASK1, the biology of DKD pathogenesis, and solid statistical methods, the decisions made for this Phase 2 study regarding delineating study population, efficacy outcomes, treatment period and statistical methods represent innovative attempts to resolve challenges specific to DKD study design.
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