KalVista Pharmaceuticals Reports Phase 3 KONFIDENT Trial Meets All Endpoints for Sebetralstat as First Oral On-demand Therapy for Hereditary Angioedema


– Sebetralstat 300 mg achieved beginning of symptom relief in 1.6 hours –

– Safety profile comparable to placebo –

– On track for submission of new drug application to U.S. FDA in the first half of 2024 –

– Conference call to discuss trial results today at 8:30 a.m. ET

CAMBRIDGE, Mass. & SALISBURY, England--(BUSINESS WIRE)-- KalVista Pharmaceuticals, Inc. (NASDAQ: KALV), a clinical stage pharmaceutical company focused on the discovery, development, and commercialization of small molecule protease inhibitors, today announced positive results from the phase 3 KONFIDENT clinical trial demonstrating statistically and clinically significant efficacy of sebetralstat as oral on-demand therapy for hereditary angioedema (HAE). KONFIDENT was the largest and most representative trial ever conducted in HAE, and included adolescents, patients using long-term prophylaxis, and all attack severities and locations.

The clinical trial met all primary and key secondary endpoints and demonstrated a favorable safety profile. HAE attacks treated with both 300 mg and 600 mg of sebetralstat achieved the primary endpoint of beginning of symptom relief significantly faster than placebo (p12).

Consistent with previous studies, sebetralstat was well-tolerated, with a safety profile similar to placebo. There were no patient withdrawals due to any adverse event and no treatment-related serious adverse events (SAEs) were observed. Treatment-related adverse event rates were 2.3% for 300 mg sebetralstat, 2.2% for 600 mg sebetralstat, and 4.8% for placebo.

“We are thrilled to announce positive phase 3 results for the KONFIDENT trial, which we believe position sebetralstat to become the first oral, on-demand therapy for the treatment of HAE. These clinically meaningful results represent a potentially significant advance for people living with HAE. If approved, sebetralstat may offer a compelling treatment option for patients and their caregivers given the long-standing preference for an effective and safe oral therapy that provides rapid symptom relief for HAE attacks,” said Andrew Crockett, Chief Executive Officer of KalVista.

Mr. Crockett added, “Most importantly, we want to thank the people living with HAE, their families, and the investigator teams around the world who supported KONFIDENT and made it the largest clinical trial ever conducted in HAE. We look forward to submitting a new drug application for sebetralstat to the U.S. FDA in the first half of 2024 and in the EU and Japan later this year.”

Primary and key secondary endpoints were analyzed in a fixed, hierarchical sequence and adjusted for multiplicity. Key secondary endpoints showed:

  • Attacks treated with sebetralstat 300 mg or 600 mg achieved a significantly faster time to a reduction in attack severity from baseline, compared to placebo (p=0.0036 for 300 mg and p=0.0032 for 600 mg)
  • Attacks treated with sebetralstat 300 mg or 600 mg demonstrated a significantly faster time to complete attack resolution, compared to placebo (p=0.0022 for 300 mg and p

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