First data from Phase 2b in ulcerave colis ("UC”) demonstrates stascally significant improvement in the Modified Mayo Score ("MMS") the primary endpoint. The 254-paent trial including 50% of paents refracve to exisng biologic or JAK therapies showed ABX464 to be effecve at all doses tested (25mg, 50mg, 100mg) with a rapid onset of acon detectable at day 8. Although not powered, the trial also achieved stascal significance in almost all secondary endpoints, except clinical remission at the two higher doses. With lile obvious dose dependence, management indicated pooling the different dose data yielded significance for all secondary endpoints. Adverse events were mild, dose-dependent and similar to placebo at the lowest 25mg dose. Data from the first 51 paents in maintenance study indicates that efficacy is sustained and increased aer 12 months. These data confirm the previous 2a data and open the door to a pivotal Phase 3 to start by YE2021E. ABX464's efficacy, safety and convenience would make the drug of choice in UC and perhaps the whole $18bn inflammatory bowel disease ("IBD") market; a strong basis for a transformave deal. Posive data from the ongoing Phase 2a study in rheumatoid arthris ("RA") expected by end Q2/2021E would open the doorto the rest of the $90bn inflammatory disease market. We reiterate our OUTPERFORM recommendaon and increase our target price to €54.

26 May 2021
ABX464 likely drug of choice in $18bn IBD market

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ABX464 likely drug of choice in $18bn IBD market
First data from Phase 2b in ulcerave colis ("UC”) demonstrates stascally significant improvement in the Modified Mayo Score ("MMS") the primary endpoint. The 254-paent trial including 50% of paents refracve to exisng biologic or JAK therapies showed ABX464 to be effecve at all doses tested (25mg, 50mg, 100mg) with a rapid onset of acon detectable at day 8. Although not powered, the trial also achieved stascal significance in almost all secondary endpoints, except clinical remission at the two higher doses. With lile obvious dose dependence, management indicated pooling the different dose data yielded significance for all secondary endpoints. Adverse events were mild, dose-dependent and similar to placebo at the lowest 25mg dose. Data from the first 51 paents in maintenance study indicates that efficacy is sustained and increased aer 12 months. These data confirm the previous 2a data and open the door to a pivotal Phase 3 to start by YE2021E. ABX464's efficacy, safety and convenience would make the drug of choice in UC and perhaps the whole $18bn inflammatory bowel disease ("IBD") market; a strong basis for a transformave deal. Posive data from the ongoing Phase 2a study in rheumatoid arthris ("RA") expected by end Q2/2021E would open the doorto the rest of the $90bn inflammatory disease market. We reiterate our OUTPERFORM recommendaon and increase our target price to €54.