ABX464 for Ulcerative Colitis

Potent Anti-Inflammatory

ABX464 is an oral, first-in-class, small molecule that has demonstrated safety and profound anti-inflammatory activity in preclinical trials and in a completed Phase 2a proof-of-concept study to treat lesions in ulcerative colitis.

In October 2019, Abivax reported exciting new data showing that 75% of the patients were in clinical remission after a 12-month open-label oral ABX464 Phase 2a maintenance study in subjects with moderate-to-severe active ulcerative colitis (UC) who had failed immunomodulators, anti-TNFα, vedolizumab and/or corticosteroids. The one year open-label ABX464 maintenance study was conducted in 22 patients without treatment interruption after completion of the randomised, double-blind, placebo-controlled 8 weeks induction study. A total of 19 patients completed the one year ABX464 open label maintenance study and showed good long-term safety and tolerability of 50mg given orally over 52 weeks.

Proven Concept

When evaluated in a Phase 2a Proof-of-Concept study, ABX464-101, ABX464 demonstrated both safety and statistically significant efficacy based on both clinical and endoscopic endpoints with 35% of the patients achieving a clinical remission (placebo: 11%) and 50% of patients achieving mucosal healing (placebo: 11%), (p=0.034)

Because of its ability to greatly upregulate production of a unique RNA splicing product and anti-inflammatory agent, miR-124, ABX464’s mechanism of action is unique and has shown promise in clinical trials in its ability to bring patients to remission and heal inflammatory lesions in ulcerative colitis.

In the Clinic

ABX464 has completed a Phase 2a proof-of-concept study, ABX464-101, aimed at evaluating the safety and efficacy of ABX464 50 mg given once daily versus placebo for two months in subjects with moderate-to-severe active ulcerative colitis (UC) who have failed or are intolerant to immunomodulators, anti-TNFα, vedolizumab and/or corticosteroids. This study revealed a statistically significant difference in mucosal healing, a hallmark of successful treatment, between ABX464 and placebo (50% vs. 11%), and also demonstrated a rapid onset of action for ABX464.

Next Steps

Based on the positive results from the ABX464-101 study, Abivax is in the process of initiating a Phase 2b study of ABX464 in ulcerative colitis in the second quarter of 2019. The company is also conducting ABX464-102, a 12-month open-label study focusing on patients from study ABX464-101. A total of 22 patients were enrolled in ABX464-102 and 6-month interim results from this trial were presented on the first quarter of 2019. 9-month interim results will be presented at the Digestive Disease Week meeting in San Diego in May 2019.