FDA Reviewers Doubt Reata Kidney Drug’s Effectiveness

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FDA reviewers have cast doubt on the effectiveness of Reata Pharmaceuticals’ bardoxolone to slow the loss of kidney function in Alport syndrome (AS) patients and reduce the risk of kidney failure with chronic use. In a briefing document released ahead of a 12/8 Cardiovascular and Renal Drugs Advisory Committee meeting, they say the company’s CARDINAL Phase 3 study did meet its prespecified primary and key secondary endpoints, which assessed on-treatment and off-treatment changes in estimated glomerular filtration rate (eGFR), but “[a] key review issue is whether the observed effects on eGFR indicate that bardoxolone slows the loss of kidney function in patients with [chronic kidney disease] CKD caused by AS.” The document further says that “[i]n addition to the concerns with CARDINAL Phase 3, there are no data in this application from an animal model of Alport syndrome or other adequate and well-controlled clinical trials in AS or CKD that show that bardoxolone slows the loss of kidney function.”

 

Specifically, the agency is seeking input from advisory committee members on:

  • Whether the observed effects on kidney function are indicative of an effect on disease progression in patients with AS (i.e., that bardoxolone slows the loss of kidney function or has any effect beyond a reversible, PD effect on kidney function)
  • Whether it is reasonable to conclude, based on the available data, that bardoxolone, when used chronically, will reduce the risk of progression to kidney failure in patients with AS

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