ABIVAX announced that the follow-up protocol ABX464-102 has been authorized by the Regulatory Authority and Ethics Committee in Belgium. The new study will recruit patients from the ongoing ulcerative colitis proof-of-concept study (ABX464-101) who are responding to treatment with ABX464 into the 12-month open label follow-up study (ABX464-102). The authorization was based on the safety of ABX464 observed in long-term preclinical studies. ABX464-101 is an ongoing Phase 2a proof-of-concept study 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 who have failed or are intolerant to immunomodulators, anti-TNFa, vedolizumab and/or corticosteroids. This clinical study is being conducted in 18 centers in eight European countries. Full regulatory and ethics committee authorizations already have been obtained in Belgium, France, Hungary, Poland, Czech Republic, Spain and Germany. ABX464-102 is a twelve-month open label follow-up study for patients with ulcerative colitis benefiting from the administration of ABX464 in the ABX464-101 study.