Didanosine

Ipsen presents 3 late-breaking presentations and 8 abstracts across rare cholestatic liver disease portfolio at AASLD 2024 PARIS, FRANCE, 18 November, 2024 Ipsen (Euronext: IPN; ADR: IPSEY) today announced data at the American Association for the Study of Liver Diseases (AASLD) assessing the long-term efficacy and safety of patients treated with Bylvay® from two Phase III open-label extension studies: late-breaking abstract (#5045) on PEDFIC 2 in Progressive Familial Intrahepatic Cholestasis (PFIC) and oral presentation ASSERT-EXT (#50) in Alagille syndrome (ALGS). Sustained efficacy data and improvements in height, weight and sleep measures were observed for patients treated with Bylvay for at least 72 weeks in both rare cholestatic diseases. “We know from our work with patient communities that receiving a diagnosis of PFIC and ALGS can be overwhelming in a patient or caregivers’ life. Disease symptoms like severe itch can have an impact on the whole family,” said Sandra Silvestri, EVP Chief Medical Officer, Ipsen. “Data suggesting Bylvay-treated patients experienced sustained efficacy, and which support the safety and tolerability profile seen in previous clinical trials, are important. Ipsen is committed to being the leader across rare cholestatic liver diseases and we are just getting started.” PEDFIC 2 Study in PFIC “These open-label extension data from PEDFIC 2 suggest that the initial reduction in pruritus and in serum bile acid levels achieved following initiation of odevixibat are being sustained into the longer term,” said Dr. Richard J. Thompson, Professor of Molecular Hepatology, King’s College London and principal investigator of the PEDFIC 2 trial. “We are also observing reductions in both pruritus and serum bile acid across a number of PFIC subtypes. This is important information for our understanding of the therapeutic management of our patients living with PFIC.” PEDFIC 2 was an open-label extension study (n=116; patients from PEDFIC 1 Bylvay and placebo cohorts at week 24, and new Bylvay-naïve patients of any age and PFIC subtype), evaluating the efficacy and safety of Bylvay through 72 weeks (n=83).1 The data showed a clinically meaningful 1-point reduction in pruritus score at week 72 in 42 percent of patients <18 years old with PFIC 1 and 2 who transitioned to Bylvay at 24 weeks (n=5/12) and 61 percent of patients with any type of PFIC and of any age excluding episodic (n=19/31). Rapid initial pruritus scores achieved by week 4 were sustained for patients who remained on treatment. At 72 weeks, the mean change in serum bile acid (sBA) levels from patients who transition to Bylvay at week 24 (n=15) was –104.00 µmol/L and Bylvay-treated patients (n=43) was -57.97 µmol/L . Beyond the clinically meaningful and sustained improvements seen in pruritus and sBA levels, height, weight and sleep increases were reported at 72 weeks in Bylvay-treated patients. Most adverse events in Bylvay-treated patients over the duration of the study were reported as mild or moderate. The most common were gastrointestinal (17.2 percent; n=20/116), including diarrhea (12 percent; n=14/116). In two cases, diarrhea led to one treatment interruption and one discontinuation. Assert-EXT Study in ALGS“The sustained improvements we've seen in Bylvay-treated individuals living with Alagille syndrome are encouraging,” said Dr. Nadia Ovchinsky, Chief, Division of Gastroenterology and Hepatology, Hassenfeld Children's Hospital at NYU Langone, New York. and principal investigator of the ASSERT trial. “These results not only show the potential to manage symptoms like pruritus, which can be extremely difficult for children and their parents to manage, but we’re also seeing a consistent safety profile over the longer term with sustained tolerability.” In ASSERT-EXT, the open-label extension study (n=50) evaluating the long-term efficacy and safety of Bylvay in ALGS patients (ages 1-15.9 years) through 72 weeks (n=44), sustained improvements were observed in pruritus and sBA levels through 72 weeks.2 At week 72, 93 percent (n=28/30) of patients who received Bylvay throughout the 24 weeks ASSERT trial and 77 percent (n=10/13) of those who transitioned from placebo to Bylvay at week 24 experienced a clinically meaningful ≥1 point reduction in pruritus score. Reductions in sBA levels were also observed in patients treated with Bylvay for 72 weeks showing a mean reduction of 124 µmol/L in those who continuously received Bylvay and a mean reduction of 139 µmol/L in patients who transitioned from placebo to Bylvay. Mean changes from baseline were observed in height (8.2 cm) and weight (2.8 kg) on continuous Bylvay use and for patients who transitioned from placebo to Bylvay, height (10.7 cm) and weight (3.3 kg) mean changes were also reported. Improvements in sleep were observed from weeks 24 to 72 across all four sleep parameters (n=43), including proportion of days seeing blood due to scratching, proportion of days needing help falling asleep, proportion of days needing soothing and daytime tiredness. Data supports the safety profile in the ASSERT clinical trial for Bylvay. Treatment emergent adverse event (TEAE) occurred in 18 percent (n=6/33) of patients who continuously received Bylvay and 41 percent (n=7/17) of patients who transitioned from placebo to Bylvay. Most adverse events were mild or moderate with diarrhea as the most common TEAE. One TEAE led to discontinuation. About PFIC and ALGSPFIC is a group of rare genetic disorders in which bile acids build up in the liver, causing damage, which may result in liver failure. ALGS is also a rare genetic disorder, affecting multiple organs including the liver, heart, skeleton, eyes and kidneys. Without early diagnosis and effective management, people living with PFIC and ALGS may need a liver transplant. Debilitating itch, caused as a result of the serum bile acid build up, is one of the most common symptoms of both PFIC and ALGS, significantly impacting sleep and daily activities and resulting in skin mutilation, loss of sleep, irritability, and poor attention. Bylvay (odevixibat) posters presented at AASLD Abstract Poster or Oral # Full title Authors ASSERT-EXT final results Oral, Abstract Parallel, ePoster [50]Monday 18 November 11:45–12:00Human Cholestatic, PBC and other Biliary Disorders in Children and Adults ASSERT-EXT: Final data from an open-label, Phase 3 study of odevixibat in patients with Alagille syndrome Nadia Ovchinsky et al. Hepatic parameters with ODX in PFIC Poster, Abstract [4277]Monday 18 November13:00–14:00Poster Session IV Effects of odevixibat vs placebo on hepatic biochemical parameters and liver adverse events in patients with PFIC: Data from the PEDFIC 1 study Tassos Grammatikopoulos et al. Phase I DDI results Poster, Abstract [4280]Monday 18 November13:00–14:00Poster Session IV A Phase 1, open-label, fixed-sequence, crossover study to evaluate the interaction of multiple-dose odevixibat with the pharmacokinetics of single-dose combined oral contraceptive steroids in healthy female participants Florent Mazuir et al. PEDFIC1/2 OLE final results (LB) Poster, Abstract [5045]Monday 18 November13:00–14:00Poster Session IV Sustained, long-term efficacy and safety of odevixibat in patients with progressive familial intrahepatic cholestasis: Results from the PEDFIC2 Phase 3, open-label extension study Richard Thompson et al. About Bylvay (odevixibat)Odevixibat is a once-daily non-systemic ileal bile acid transport (IBAT) inhibitor approved under the brand name Bylvay® in the U.S. as the first drug treatment option for patients 3 months of age and older living with cholestatic pruritus due to progressive familial intrahepatic cholestasis (PFIC). BYLVAY may not be effective in a subgroup of PFIC type 2 patients with specific ABCB11 variants resulting in non-functional or complete absence of the bile salt export pump protein. Odevixibat was also approved in June 2021 in the E.U. under the brand name Bylvay®, as the first drug treatment option for all types of PFIC in patients aged 6 months or older. Bylvay has received orphan exclusivity for the treatment of PFIC in the U.S. and E.U. In June 2023 Bylvay was approved in the U.S. for the treatment of cholestatic pruritus in patients from 12 months of age with Alagille syndrome (ALGS) and received orphan exclusivity for ALGS. In September 2024, odevixibat was approved in the E.U under the brand name Kayfanda® for the treatment of cholestatic pruritus in ALGS in patients aged 6 months or older. IMPORTANT SAFETY INFORMATION – U.S.Warnings and Precautions: Liver Test AbnormalitiesPatients who enrolled in PFIC and ALGS clinical trials had abnormal liver tests at baseline. In clinical trials, treatment-emergent elevations of liver tests or worsening of liver tests relative to baseline values were observed. Most abnormalities included elevations in aspartate aminotransferase (AST), alanine transaminase (ALT) in PFIC and ALGS, and total and direct bilirubin in PFIC clinical trials. No patients permanently discontinued treatment due to liver test abnormalities. Obtain baseline liver tests and monitor during treatment. Dose reduction or treatment interruption may be required if abnormalities occur. For persistent or recurrent liver test abnormalities, consider treatment discontinuation. Permanently discontinue Bylvay if a patient progresses to portal hypertension or experiences a hepatic decompensation event. DiarrheaDiarrhea occurred in both PFIC and ALGS clinical trials in BYLVAY-treated patients at a rate greater than placebo treated patients. If diarrhea occurs with use of BYLVAY, monitor for dehydration and treat promptly. Treatment interruption or discontinuation may be required for persistent diarrhea with no alternate etiology. Fat-Soluble Vitamin (FSV) DeficiencyFat-soluble vitamins (FSV) include vitamin A, D, E, and K. PFIC and ALGS patients can have FSV deficiency at baseline, as part of their disease. BYLVAY may affect absorption of fat-soluble vitamins. Obtain baseline levels and monitor during treatment, along with any clinical manifestations. Supplement if deficiency is observed. If FSV deficiency persists or worsens despite FSV supplementation, discontinue treatment. ADVERSE REACTIONSALGS: The most common adverse reactions (>5%) are diarrhea, abdominal pain, hematoma, and decreased weight.PFIC: The most common adverse reactions (>2%) are diarrhea, liver test abnormalities, vomiting, abdominal pain, and fat-soluble vitamin deficiency. DRUG INTERACTIONSFor patients taking bile acid binding resins, take BYLVAY at least 4 hours before or 4 hours after administering, as bile acid binding resins may bind to and reduce BYLVAY efficacy. USE IN SPECIFIC POPULATIONSThere are no human data on BYLVAY use in pregnant persons to establish a drug-associated risk of major birth defects, miscarriage, or adverse developmental outcomes. Based on findings from animal reproduction studies, BYLVAY may cause cardiac malformations when a fetus is exposed during pregnancy. There is a pregnancy safety study that monitors pregnancy outcomes in women exposed to BYLVAY during pregnancy. Pregnant women exposed to BYLVAY, or their healthcare providers, should report BYLVAY exposure by calling 1-855-463-5127. To report SUSPECTED ADVERSE REACTIONS, contact Ipsen Biopharmaceuticals, Inc. at +1-855-463-5127, or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. Indications and Usage U.S.Bylvay is an ileal bile acid transporter (IBAT) inhibitor indicated for the treatment of cholestatic pruritus in:Patients 12 months of age and older with Alagille syndrome (ALGS)Patients 3 months of age and older with progressive familial intrahepatic cholestasis (PFIC) Limitation of useBylvay may not be effective in a subgroup of PFIC type 2 patients with specific ABCB11 variants resulting in non-functional or complete absence of the bile salt export pump protein Please see full U.S. Prescribing Information. Indications of use E.U.Bylvay is indicated for the treatment of progressive familial intrahepatic cholestasis (PFIC) in patients aged 6 months or older. Please see full E.U. Prescribing Information. Kayfanda is indicated for the treatment of cholestatic pruritus in Alagille syndrome (ALGS) in patients aged 6 months or older. Please see full E.U. Prescribing Information. ENDS About PEDFIC 1 and 2PEDFIC 1 was a 24-week double-blind, randomized, placebo-controlled trial that evaluated the efficacy and tolerability of two doses of odevixibat in reducing pruritus and serum bile acid levels in children with PFIC 1 or 2. PEDFIC 2 is a 72-week open label extension trial, which consisted of children from PEDFIC 1 who received either Bylvay (cohort 1a) or placebo (cohort 1b) and a new cohort (2) of Bylvay-naïve patients of any age and PFIC subtype. PEDFIC is the largest, global, Phase III trial ever conducted in PFIC. PEDFIC 1 (NCT03566238) was a 24-week double-blind, randomized (1:1:1), placebo-controlled trial that evaluated the efficacy and tolerability of two doses of odevixibat in reducing pruritus and serum bile acid levels in children with PFIC 1 or 2. Participants were randomly allocated to receive placebo (n=20), odevixibat 40 μg/kg (n=23), or odevixibat 120 μg/kg (n=19) once a day. The results were published in The Lancet.3 PEDFIC 2 (NCT03659916), an open-label extension of PEDFIC 1, is a 72-week trial that aimed to evaluate the efficacy and tolerability of odevixibat 120 µg/kg once a day in patients with PFIC. Patients were divided into two cohorts: Cohort 1 (n=56) which consisted of children with PFIC 1 or 2 from PEDFIC 1 who received odevixibat (Cohort 1a: n= 37) or placebo (Cohort 1b: n=19), respectively, and Cohort 2 (n=60) which consisted of newly enrolled, odevixibat-naïve patients of any age and PFIC subtype. Interim results were published in The Journal of Hepatology.4 About ASSERT and ASSERT-EXTASSERT (NCT04674761) was a 24-week double-blind, randomized, placebo-controlled trial with an open-label long term extension. ASSERT evaluated the safety and efficacy of 120 µg /kg once-daily odevixibat vs placebo for the treatment of cholestatic pruritus in patients with Alagille syndrome (ALGS). The trial enrolled 52 patients of any age with a genetically confirmed diagnosis of ALGS. The results were published in The Lancet.5 In ASSERT-EXT (NCT05035030), ASSERT’s ongoing open-label extension, all trial participants received 120 μg/kg of odevixibat once daily for 72-weeks after the double-blind treatment period completed. In both ASSERT and ASSERT-EXT, the investigators looked for changes in pruritus, serum bile acid concentrations, sleep, and treatment-emergent adverse events. About IpsenWe are a global biopharmaceutical company with a focus on bringing transformative medicines to patients in three therapeutic areas: Oncology, Rare Disease and Neuroscience. Our pipeline is fueled by external innovation and supported by nearly 100 years of development experience and global hubs in the U.S., France and the U.K. Our teams in more than 40 countries and our partnerships around the world enable us to bring medicines to patients in more than 80 countries. Ipsen is listed in Paris (Euronext: IPN) and in the U.S. through a Sponsored Level I American Depositary Receipt program (ADR: IPSEY). For more information, visit ipsen.com Ipsen Media contacts Investors Nicolas Bogler | + 33 6 52 19 98 92 Media Jennifer Smith-Parker | + 44 7487 75 71 00 | jennifer.smith-parker.ext@ipsen.comRachel Reiff | + 1 908 616 1680 | rachel.reiff@ipsen.comAnna Gibbins | + 44 7717 80 19 00 | anna.gibbins@ipsen.com Disclaimers and/or Forward-Looking Statements Ipsen The forward-looking statements, objectives and targets contained herein are based on Ipsen’s management strategy, current views and assumptions. Such statements involve known and unknown risks and uncertainties that may cause actual results, performance or events to differ materially from those anticipated herein. All of the above risks could affect Ipsen’s future ability to achieve its financial targets, which were set assuming reasonable macroeconomic conditions based on the information available today. Use of the words ‘believes’, ‘anticipates’ and ‘expects’ and similar expressions are intended to identify forward-looking statements, including Ipsen’s expectations regarding future events, including regulatory filings and determinations. Moreover, the targets described in this document were prepared without taking into account external-growth assumptions and potential future acquisitions, which may alter these parameters. These objectives are based on data and assumptions regarded as reasonable by Ipsen. These targets depend on conditions or facts likely to happen in the future, and not exclusively on historical data. Actual results may depart significantly from these targets given the occurrence of certain risks and uncertainties, notably the fact that a promising medicine in early development phase or clinical trial may end up never being launched on the market or reaching its commercial targets, notably for regulatory or competition reasons. Ipsen must face or might face competition from generic medicine that might translate into a loss of market share. Furthermore, the research and development process involves several stages each of which involves the substantial risk that Ipsen may fail to achieve its objectives and be forced to abandon its efforts with regards to a medicine in which it has invested significant sums. Therefore, Ipsen cannot be certain that favorable results obtained during preclinical trials will be confirmed subsequently during clinical trials, or that the results of clinical trials will be sufficient to demonstrate the safe and effective nature of the medicine concerned. There can be no guarantees a medicine will receive the necessary regulatory approvals or that the medicine will prove to be commercially successful. If underlying assumptions prove inaccurate or risks or uncertainties materialize, actual results may differ materially from those set forth in the forward-looking statements. Other risks and uncertainties include but are not limited to, general industry conditions and competition; general economic factors, including interest rate and currency exchange rate fluctuations; the impact of pharmaceutical industry regulation and healthcare legislation; global trends toward healthcare cost containment; technological advances, new medicine and patents attained by competitors; challenges inherent in new-medicine development, including obtaining regulatory approval; Ipsen’s ability to accurately predict future market conditions; manufacturing difficulties or delays; financial instability of international economies and sovereign risk; dependence on the effectiveness of Ipsen’s patents and other protections for innovative medicines; and the exposure to litigation, including patent litigation, and/or regulatory actions. Ipsen also depends on third parties to develop and market some of its medicines which could potentially generate substantial royalties; these partners could behave in such ways which could cause damage to Ipsen’s activities and financial results. Ipsen cannot be certain that its partners will fulfil their obligations. It might be unable to obtain any benefit from those agreements. A default by any of Ipsen’s partners could generate lower revenues than expected. Such situations could have a negative impact on Ipsen’s business, financial position or performance. Ipsen expressly disclaims any obligation or undertaking to update or revise any forward-looking statements, targets or estimates contained in this press release to reflect any change in events, conditions, assumptions or circumstances on which any such statements are based, unless so required by applicable law. Ipsen’s business is subject to the risk factors outlined in its registration documents filed with the French Autorité des Marchés Financiers. The risks and uncertainties set out are not exhaustive and the reader is advised to refer to Ipsen’s latest Universal Registration Document, available on ipsen.com. References 1Thompson RJ, et al. Sustained, long-term efficacy and safety of odevixibat in patients with progressive familial intrahepatic cholestasis: Results from the PEDFIC2 phase 3, open-label extension study. Poster Abstract 5045, American Association for the Study of Liver Disease (AASLD). 20242 Ovchinsky N., et al. ASSERT-EXT: Final data from an open-label, phase 3 study of odevixibat in patients with Alagille syndrome. Oral abstract Parallel ePoster 50. American Association for the Study of Liver Disease (AASLD). 20243 Thompson RJ, et al. Odevixibat treatment in progressive familial intrahepatic cholestasis: a randomised, placebo-controlled, phase 3 trial. Lancet Gastroenterol Hepatol. 2022. 7:830–842.4 Thompson RJ, et al. Interim results from an ongoing, open-label, single-arm trial of odevixibat in progressive familial intrahepatic cholestasis 2023. JHEP Rep. 5(8):100782.5 Ovchinsky N., et al. Efficacy and safety of odevixibat in patients with Alagille syndrome (ASSERT); a phase 3, double-blind, randomized, placebo-controlled trial. Lancet Gastroenterol / Hepatol. 2024 doi.org/10.1016/S2468-1253(24)00074-8. Attachment Ipsen PR_Bylvay® (odevixibat) data shows sustained improvement in severe itch and sBA in PFIC and ALGS_181124

97% SVR12 Rate Observed with 8 Weeks of Treatment in Lead-In Cohort of HCV-Infected Patients in Ongoing Phase 2 Clinical Study EASL Presentations Continue to Support Best-in-Class Potential with High Antiviral Potency, Short Treatment Duration, Low Risk of Drug Interaction and High Barrier to Resistance BOSTON, June 05, 2024 (GLOBE NEWSWIRE) -- Atea Pharmaceuticals, Inc. (Nasdaq: AVIR) (“Atea”), a clinical-stage biopharmaceutical company engaged in the discovery and development of oral antiviral therapeutics for serious viral diseases, today announced new data from the lead-in cohort (n=60) of the Company’s ongoing Phase 2 combination study of bemnifosbuvir, an oral nucleotide NS5B polymerase inhibitor, and ruzasvir, an oral NS5A inhibitor, for the treatment of hepatitis C virus (HCV). With an 8-week treatment duration, the Phase 2 data from the lead-in cohort of non-cirrhotic patients showed a 97% sustained virologic response rate at 12 weeks post-treatment (SVR12), which is the primary efficacy endpoint of the study. The Company will also present preclinical data further demonstrating a high barrier to resistance and pharmacokinetics for bemnifosbuvir and a low risk of drug-drug interactions for ruzasvir. These data are being presented at the European Association for the Study of the Liver (EASL) Congress taking place June 5-8, 2024, in Milan, Italy. “Today, new challenges are hindering progress towards our goal of HCV elimination in the U.S. and globally. Patient demographics have changed, and the pace of new HCV infections is quickly outpacing the rate of those being treated. It is apparent that further innovations are required to address the needs of today’s HCV-infected patients,” said Jean-Pierre Sommadossi, PhD, Chief Executive Officer and Founder of Atea Pharmaceuticals. “The data being presented at EASL demonstrate a potential best-in-class pro combines the most compelling attributes of current HCV drug treatments through the innovative combination of bemnifosbuvir and ruzasvir. We look forward to reporting the full results from our ongoing Phase 2 study during the second half of this year.” Results from the lead-in cohort of the Phase 2 study also showed a 100% SVR12 rate in participants infected with genotype 3 (n=13), a historically difficult-to-treat genotype of HCV. The combination regimen was well tolerated, with no drug-related severe adverse events (SAEs) or treatment discontinuations. Based on these positive data from the lead-in cohort, the Phase 2 study continues, with the aim of enrolling up to an additional 220 subjects, including those with compensated cirrhosis. “Today, many of my HCV patients present with other conditions requiring multiple concurrent therapies and complicated lives,” said Eric Lawitz, MD, The Texas Liver Institute, Clinical Professor of Medicine, University of Texas Health San Antonio. “I am excited about the initial bemnifosbuvir and ruzasvir combination data. The combination of a short 8-week treatment duration, a low risk of drug-drug interactions, and robust antiviral efficacy across all genotypes makes this an attractive regimen.” More than 2 million people in the U.S. are living with chronic HCV, and approximately 100,000 new chronic cases are diagnosed each year. HCV diagnoses continually outpace annual treatment rates, as less than a third of those diagnosed with HCV receive timely treatment. Data Presented at EASL Include: Poster Title: Lead-in Cohort Results From a Phase 2 Study of a Novel 8-Week Combination Regimen of Bemnifosbuvir and Ruzasvir in Patients with Chronic Hepatitis C Virus Infection (THU-382) Conclusion: Data from the lead-in cohort of 60 patients in the Phase 2 clinical trial of bemnifosbuvir and ruzasvir in HCV-infected subjects showed a high SVR12 rate of 97% in the lead-in cohort with a short 8-week duration of treatment. The primary endpoints of the study are safety and SVR12. Viral kinetics were similar in genotype 1 and genotype 3 infected subjects, including a 100% SVR12 rate in historically difficult-to-treat genotype 3 infected subjects. The combination was generally safe and well tolerated. There were no drug-related serious adverse events or treatment discontinuations, and adverse events were mostly mild. Poster Title: Bemnifosbuvir is a Potent HCV NS5B Inhibitor with a Favorable Antiviral Pro High Resistance Barrier (SAT-402) Conclusion: Viral resistance is an important consideration for direct-acting antiviral (DAA) use as it may impact the efficacy of treatments for HCV infection. Results demonstrated that bemnifosbuvir is at least ten-fold more potent than sofosbuvir, a medication to treat HCV infections, across all genotypes tested and is not resistant to resistance-associated substitutions (RASs) that have been found to alter the activity of sofosbuvir. While the C223H mutation was found to be the primary bemnifosbuvir RAS in genotype 1b, multiple additional substitutions at other NS5B regions were required to confer meaningful resistance, suggesting that bemnifosbuvir provides a high barrier to resistance. Based upon the data demonstrated to date, it is expected that the bemnifosbuvir and ruzasvir combination should have a more compelling antiviral pro major HCV NS5A RAVs than the current standard of care. Poster Title: Absorption, Distribution, Metabolism, and Excretion of [14C]-Bemnifosbuvir in Rats (SAT-411) Conclusion: This preclinical study in rats was conducted to better understand the tissue distribution, metabolites, and excretion routes following bemnifosbuvir treatment. Following a single oral dose in rats, bemnifosbuvir has favorable overall absorption, distribution, metabolism, and excretion (ADME) properties, including good bioavailability (>60%) and wide distribution to tissues with low penetration into the brain. Bemnifosbuvir was highly and rapidly metabolized to the metabolite AT-273, consistent with the proposed metabolic and activation pathway. Poster Title: Low Risk of Drug-Drug Interactions for Ruzasvir Based Upon In Vitro Metabolism and Transporter Interaction Studies (SAT-412) Conclusion: Many patients infected with HCV are also taking multiple co-medications, which may impact treatment decisions. This preclinical study aimed to further understand the risk of drug-drug interactions (DDIs) for ruzasvir by analyzing its metabolism in human liver microsomes and cells. Based on these in vitro data and static DDI risk assessment models, ruzasvir has a low potential to be a perpetrator of DDIs via inhibition or induction of CYP450. Similarly, it has a low potential to inhibit OATP1B1 and OATP1B3 transporters. The relevance of bile salt export pump (BSEP) inhibition to DDIs is limited. About Hepatitis C Virus Hepatitis C virus (HCV) is a blood-borne, positive-sense, single-stranded (ss)RNA virus that primarily infects liver cells. HCV is a leading cause of chronic liver disease and liver transplants, spreading via blood transfusion, hemodialysis, and needle sticks. An estimated 50 million people globally live with chronic HCV infection, with approximately 1 million new infections and 242,000 deaths occurring each year. Most HCV-related deaths are due to liver scarring (cirrhosis) and liver cancer (hepatocellular carcinoma). Injection drug use accounts for around 30% of new HCV cases globally and approximately 60% in the U.S. Annually, HCV diagnoses in the U.S. outpace treatment rates, as less than a third of those diagnosed with HCV receive timely treatment. About Bemnifosbuvir and Ruzasvir for Hepatitis C Virus (HCV) Bemnifosbuvir is an oral, purine nucleotide prodrug designed to inhibit viral replication by impairing viral RNA polymerase, a key component in the replication machinery of enveloped positive single-stranded RNA viruses, such as human coronaviruses and HCV. Atea is developing bemnifosbuvir in combination with ruzasvir, an oral NS5A inhibitor for the treatment of HCV. As single agents, both bemnifosbuvir and ruzasvir have demonstrated potent pan-genotypic antiviral activity against HCV. The combination of bemnifosbuvir and ruzasvir has exhibited synergistic in vitro activity against HCV with no pharmacokinetic (PK) drug-drug interactions in healthy volunteers. In vitro studies have shown bemnifosbuvir to be approximately 10-fold more active than sofosbuvir (SOF) against a panel of laboratory strains and clinical isolates of HCV GT 1–5. In vitro studies have also demonstrated that bemnifosbuvir remained fully active against SOF resistance-associated strains (S282T), with up to 58-fold more potency than SOF. The PK pro bemnifosbuvir supports once-daily dosing for the treatment of HCV. Across both HCV and COVID-19 programs, bemnifosbuvir has been administered to over 2,100 subjects and has been well-tolerated at doses up to 550 mg for durations up 12 weeks in healthy subjects and patients. Ruzasvir has demonstrated highly potent and pan-genotypic antiviral activity in preclinical (picomolar range) and clinical studies. Ruzasvir has been administered to over 1,200 HCV-infected patients at daily doses of up to 180 mg for 12 weeks and has demonstrated a favorable safety profile. Ruzasvir’s PK pro once-daily dosing. About the Phase 2 Study Atea is currently conducting a global Phase 2 clinical trial in treatment-naïve, chronic HCV-infected patients either without cirrhosis or with compensated cirrhosis. This study is designed to evaluate the safety and efficacy of eight weeks of treatment with the combination consisting of once-daily bemnifosbuvir 550 mg and ruzasvir 180 mg. Up to approximately 280 treatment-naïve patients across all HCV genotypes, including the lead-in cohort of 60 patients without cirrhosis, are expected to be enrolled in this Phase 2 clinical trial. The primary endpoints of the study are safety and sustained virologic response (SVR) at 12 weeks post-treatment (SVR12). Other virologic endpoints include virologic failure, SVR at 24 weeks post-treatment (SVR24) and resistance. Topline results from all patients enrolled in the Phase 2 study are anticipated in the second half of 2024. About Atea Pharmaceuticals Atea is a clinical-stage biopharmaceutical company focused on discovering, developing and commercializing oral antiviral therapies to address the unmet medical needs of patients with serious viral infections. Leveraging the Company’s deep understanding of antiviral drug development, nucleos(t)ide chemistry, biology, biochemistry and virology, Atea has built a proprietary nucleos(t)ide prodrug platform to develop novel product candidates to treat single stranded ribonucleic acid, or ssRNA, viruses, which are a prevalent cause of serious viral diseases. Atea plans to continue to build its pipeline of antiviral product candidates by augmenting its nucleos(t)ide platform with other classes of antivirals that may be used in combination with its nucleos(t)ide product candidates. Currently, Atea is focused on the development of orally-available antiviral agents for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes COVID-19, and hepatitis C virus (HCV). For more information, please visit . Forward-Looking Statements This press release includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements in this press release include but are not limited to the Company’s plans relating to the date and time of the presentations at the conference, the time of anticipated release of additional clinical data and the potential of bemnifosbuvir in combination with ruzasvir to treat HCV. When used herein, words including “expects,” “may,” “will,” “anticipates,” “plans,” and similar expressions are intended to identify forward-looking statements. In addition, any statements or information that refer to expectations, beliefs, plans, projections, objectives, performance or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking. All forward-looking statements are based upon the Company’s current expectations and various assumptions. The Company believes there is a reasonable basis for its expectations and beliefs, but they are inherently uncertain. The Company may not realize its expectations, and its beliefs may not prove correct. Actual results could differ materially from those described or implied by such forward-looking statements as a result of various important factors, including, without limitation, the important factors discussed and updated from time to time under the caption “Risk Factors” in the reports the Company files with the SEC, including annual reports on Form10-K, quarterly reports on Form10-Q, current reports on Form 8-K and other filings each of which are accessible on the SEC’s website at These and other important factors could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management’s estimates as of the date of this press release. While the Company may elect to update such forward-looking statements at some point in the future, except as required by law, it disclaims any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing the Company’s views as of any date subsequent to the date of this press release. Contacts Jonae Barnes SVP, Investor Relations and Corporate Communications 617-818-2985 Barnes.jonae@ateapharma.com Will O’Connor Precision AQ 212-362-1200 will.oconnor@precisionaq.com