A Phase IIa Efficacy and Safety Trial With Intravenous S95011 in Primary Sjögren's Syndrome Patients: An International, Multicentre, Randomised, Double-blind, Placebo-controlled Study

The purpose of this study is to assess the effect of multiple intravenous infusions of S95011 compared to placebo in reducing disease activity in patients with primary Sjögren's syndrome.

Start Date03 Aug 2021

Sponsor / Collaborator

Institut de Recherches Intern Servier

[+1]

EUCTR2020-001398-59-BG / Unknown statusPhase 2

Randomized, double-blind, Phase 2 study to evaluate the efficacy and the safety of OSE-127 versus placebo in subjects with moderate to severe active ulcerative colitis who have failed or are intolerant to previous treatment(s)

Start Date13 Oct 2020

Sponsor / Collaborator

OSE Immunotherapeutics SA

NCT04882007 / Unknown statusPhase 2

Randomized, Double-blind, Phase 2 Study to Evaluate the Efficacy and the Safety of OSE-127 Versus Placebo in Subjects With Moderate to Severe Active Ulcerative Colitis Who Have Failed or Are Intolerant to Previous Treatment(s)

This is a phase 2, multicenter, randomized, double-blind, placebo-controlled, parallel-group study in patients with moderate to severe active ulcerative colitis.

Start Date02 Oct 2020

Sponsor / Collaborator

OSE Immunotherapeutics SA

100 Clinical Results associated with Lusvertikimab

100 Translational Medicine associated with Lusvertikimab

100 Patents (Medical) associated with Lusvertikimab

Literatures (Medical) associated with Lusvertikimab

15 Mar 2023·Journal of immunology (Baltimore, Md. : 1950)

First-in-Human Study in Healthy Subjects with the Noncytotoxic Monoclonal Antibody OSE-127, a Strict Antagonist of IL-7Rα

Article

Author: Costantini, Dominique ; Conduzorgues, Jean-Pascal ; Poirier, Nicolas ; Abès, Riad ; Teppaz, Géraldine ; Volckaert, Bram ; De Sa, Fanny ; Girault, Isabelle ; Corallo, Frédérique ; Belarif, Lyssia ; Poli, Sonia ; Mary, Caroline ; Braudeau, Cécile ; Pengam, Sabrina ; Josien, Regis ; Soma, Emilienne ; Baccelli, Irène ; Fromond, Claudia

Abstract:

OSE-127 is a humanized mAb targeting the IL-7Rα-chain (CD127), under development for inflammatory and autoimmune disease treatment. It is a strict antagonist of the IL-7R pathway, is not internalized by target cells, and is noncytotoxic. In this work, a first-in-human, phase I, randomized, double-blind, placebo-controlled, single-center study was carried out to determine the safety, pharmacokinetics, pharmacodynamics, and immunogenicity of OSE-127 administration. Sixty-three healthy subjects were randomly assigned to nine groups: six single ascending dose groups with i.v. administration (0.002–10 mg/kg), a single s.c. treatment group (1 mg/kg), and two double i.v. injection groups (6 or 10 mg/kg). Subjects were followed during <146 d. OSE-127’s pharmacokinetic half-life after a single dose increased from 4.6 (1 mg/kg) to 11.7 d (10 mg/kg) and, after a second dose, from 12.5 (6 mg/kg) to 16.25 d (10 mg/kg). Receptor occupancy was ≥95% at doses ≥0.02 mg/kg, and this saturation level was maintained >100 d after two i.v. infusions at 10 mg/kg. IL-7 consumption was inhibited by OSE-127 administration, as demonstrated by a decreased IL-7 pathway gene signature in peripheral blood cells and by ex vivo T lymphocyte restimulation experiments. OSE-127 was well tolerated, with no evidence of cytokine-release syndrome and no significant alteration of blood lymphocyte counts or subset populations. Altogether, the observed lack of significant lymphopenia or serious adverse events, concomitant with the dose-dependent inhibition of IL-7 consumption by target cells, highlights that OSE-127 may show clinical activity in IL-7R pathway–involved diseases.

01 Jun 2022·ACR open rheumatology

Interferon Inhibition for Lupus with Anifrolumab: Critical Appraisal of the Evidence Leading to FDA Approval

Author: Loncharich, Michael F. ; Anderson, Caleb W.

Journal Club:

Furie R, Khamashta M, Merrill JT, Werth VP, Kalunian K, Brohawn P, et al. Anifrolumab, an anti‐interferon‐α receptor monoclonal antibody, in moderate‐to‐severe systemic lupus erythematosus. Arthritis Rheumatol 2017;69:376‐86.

Objective:

To assess the efficacy and safety of anifrolumab, a type I interferon (IFN) receptor antagonist, in a phase IIb, randomized, double‐blind, placebo‐controlled study of adults with moderate‐to‐severe systemic lupus erythematosus (SLE).

Methods:

We randomly assigned patients in a 1:1 ratio to receive intravenous anifrolumab (300 mg) or placebo every 4 weeks for 48 weeks. The primary end point of this trial was a response at week 52 defined with the use of the British Isles Lupus Assessment Group (BILAG)–based Composite Lupus Assessment (BICLA). A BICLA response requires reduction in any moderate‐to‐severe baseline disease activity and no worsening in any of nine organ systems in the BILAG index, no worsening on the Systemic Lupus Erythematosus Disease Activity Index, no increase of 0.3 points or more in the score on the Physician Global Assessment of disease activity (on a scale from 0 [no disease activity] to 3 [severe disease]), no discontinuation of the trial intervention, and no use of medications restricted by the protocol. Secondary end points included a BICLA response in patients with a high interferon gene signature at baseline; reductions in the glucocorticoid dose, in the severity of skin disease, and in counts of swollen and tender joints; and the annualized flare rate.

Results:

A total of 362 patients received the randomized intervention: 180 received anifrolumab and 182 received placebo. The percentage of patients who had a BICLA response was 47.8% in the anifrolumab group and 31.5% in the placebo group (difference, 16.3 percentage points; 95% confidence interval, 6.3 to 26.3; P = 0.001). Among patients with a high interferon gene signature, the percentage with a response was 48.0% in the anifrolumab group and 30.7% in the placebo group; among patients with a low interferon gene signature, the percentage was 46.7% and 35.5%, respectively. Secondary end points with respect to the glucocorticoid dose and the severity of skin disease, but not counts of swollen and tender joints and the annualized flare rate, also showed a significant benefit with anifrolumab. Herpes zoster and bronchitis occurred in 7.2% and 12.2% of the patients, respectively, who received anifrolumab. There was one death from pneumonia in the anifrolumab group.

Conclusion:

Anifrolumab substantially reduced disease activity compared with placebo across multiple clinical end points in the patients with moderate‐to‐severe SLE.https://onlinelibrary-wiley-com.libproxy1.nus.edu.sg/doi/10.1002/art.39962Furie RA, Morand EF, Bruce IN, Manzi S, Kalunian KC, Vital EM, et al. Type I interferon inhibitor anifrolumab in active systemic lupus erythematosus (TULIP‐1): a randomised, controlled, phase 3 trial. Lancet Rheumatol 2019;1:E208‐19.

Background:

Anifrolumab, a human monoclonal antibody to type I interferon receptor subunit 1 investigated for the treatment of systemic lupus erythematosus (SLE), did not have a significant effect on the primary end point in a previous phase 3 trial. The current phase 3 trial used a secondary end point from that trial as the primary end point.

Findings:

Between June 9, 2015, and June 16, 2017, 457 patients were randomly assigned to the anifrolumab 300 mg group (n = 180), the anifrolumab 150 mg group (n = 93), or the placebo group (n = 184). The proportion of patients at week 52 with an SRI‐4 response was similar between anifrolumab 300 mg (65 [36%] of 180) and placebo (74 [40%] of 184; difference − 4·2 [95% CI −14·2 to 5·8], p = 0·41). Similarly, proportions of patients with an SRI‐4 response at week 24, and at week 52 in patients in the interferon gene signature test—high subgroup, did not differ between the anifrolumab and placebo groups. In patients with baseline oral corticosteroids of at least 10 mg/day, sustained dose reduction to 7·5 mg/day or less was achieved by 42 (41%) of 103 patients in the anifrolumab 300 mg group and 33 (32%) of 102 patients in the placebo group (difference 8·9 [95% CI −4·1 to 21·9]). In patients with CLASI activity score of at least 10 at baseline, at least 50% reduction by week 12 was achieved by 24 (42%) of 58 patients in the anifrolumab 300 mg group and 14 (25%) of 54 in the placebo group (difference 17·0 [95% CI −0·3 to 34·3]). Annualised flare rates were 0·60 for anifrolumab and 0·72 for placebo (rate ratio 0·83 [95% CI 0·60 to 1·14]). BICLA response was achieved by 67 (37%) of 180 patients receiving anifrolumab 300 mg versus 49 (27%) of 184 receiving placebo (difference 10·1 [95% CI 0·6 to 19·7]). Anifrolumab's safety profile was similar to that observed in phase 2, with similar proportions of patients having a serious adverse event between groups (25 [14%] of 180 for anifrolumab 300 mg, ten [11%] of 93 for anifrolumab 150 mg, and 30 [16%] of 184 for placebo).

Interpretation:

The primary endpoint was not reached. However, several secondary endpoints, including reduction in oral corticosteroid dose, CLASI responses, and BICLA responses, suggest clinical benefit of anifrolumab compared with placebo. Conclusive evidence for the efficacy of anifrolumab awaits further phase 3 trial data. Despite the inherent limitations of a 1‐year phase 3 study, such as incomplete knowledge of applicability to the general population and scarce detection of rare safety signals, in addition to complications from prespecified restricted medication rules, our results suggest that anifrolumab might have the potential to provide a treatment option for patients who have active SLE while receiving standard therapy.

Funding:

AstraZeneca.https://www-thelancet-com.libproxy1.nus.edu.sg/journals/lanrhe/article/PIIS2665-9913(19)30076‐1/fulltextMorand EF, Furie R, Tanaka Y, Bruce IN, Askanase AD, Richez C, et al. Trial of anifrolumab in active systemic lupus erythematosus. N Engl J Med 2020;382:211‐21.

Conclusions:

Monthly administration of anifrolumab resulted in a higher percentage of patients with a response (as defined by a composite end point) at week 52 than did placebo, in contrast to the findings of a similar phase 3 trial involving patients with SLE that had a different primary end point. The frequency of herpes zoster was higher with anifrolumab than with placebo. (Funded by AstraZeneca; ClinicalTrials.gov number, NCT02446899.)https://www-nejm-org.libproxy1.nus.edu.sg/doi/full/10.1056/nejmoa1912196

29 Apr 2022·Biochemical Society TransactionsQ2 · BIOLOGY

MMP-7 marks severe pancreatic cancer and alters tumor cell signaling by proteolytic release of ectodomains

Q2 · BIOLOGY

Review

Author: Van Doren, Steven R.

Pancreatic cancer incurs the worst survival rate of the major cancers. High levels of the protease matrix metalloproteinase-7 (MMP-7) in circulation correlate with poor prognosis and limited survival of patients. MMP-7 is required for a key path of pancreatic tumorigenesis in mice and is present throughout tumor progression. Enhancements to chemotherapies are needed for increasing the number of pancreatic tumors that can be removed and for preventing relapses after surgery. With these ends in mind, selective inhibition of MMP-7 may be worth investigation. An anti-MMP-7 monoclonal antibody was recently shown to increase the susceptibility of several pancreatic cancer cell lines to chemotherapeutics, increase their apoptosis, and decrease their migration. MMP-7 activities are most apparent at the surfaces of innate immune, epithelial, and tumor cells. Proteolytic shedding of multiple protein ectodomains by MMP-7 from such cell surfaces influence apoptosis, proliferation, migration, and invasion. These activities warrant targeting of MMP-7 selectively in pancreatic cancer and other tumors of mucosal epithelia. Competitive and non-competitive modes of MMP-7 inhibition are discussed.

News (Medical) associated with Lusvertikimab

01 Jul 2024

·www.biospace.com

OSE Immunotherapeutics Announces Publication of Preclinical Efficacy Results with Lusvertikimab in Acute Lymphoblastic Leukemia in the Journal ‘Blood’

Nantes, France – July 1st, 2024 – 7:30 am CET – OSE Immunotherapeutics SA (ISIN: FR0012127173; Mnemo: OSE) today announced the publication of an article on latest preclinical efficacy data on the use of its anti-IL-7 receptor (IL-7R A&io) antagonist Lusvertikimab (OSE-127) for the treatment of B- and T-Cell Acute Lymphoblastic Leukemia (B- and T-ALL) in ‘Blood’, a peer-reviewed medical journal published by the American Society of Hematology. The preclinical data on Lusvertikimab published in ‘Blood’ was generated from a collaborative research program between OSE Immunotherapeutics and the University Medical Center Schleswig-Holstein in Kiel (Germany). This collaboration is using patient-derived samples and in-vivo xenograft models to evaluate the therapeutic potential of anti-IL-7R antagonist Lusvertikimab in targeting and blocking the high and dysregulated IL-7R-expression observed in nearly 85% of B- or T-Acute Lymphoblastic Leukemia (ALL) patients. Pr. Denis Schewe (newly appointed Head of Pediatric Hematology/Oncology, University Hospital Dresden and National Center for Tumor Diseases, Partner Site Dresden, and formerly from the University Medical Center Schleswig-Holstein of Kiel) and Dr. Lennart Lenk (Department of Pediatrics I, Christian-Albrechts University Kiel and University Medical Center Schleswig-Holstein, Kiel), leading the research program in collaboration with OSE Immunotherapeutics, comment: “Treatment options for T-ALL remain very limited and there is an urgent need for novel immunotherapy approaches to reduce toxicity and to target relapsed or refractory disease in ALL patients. Through its dual mode of action comprising both IL-7R signaling blockade and antibody-dependent cellular phagocytosis induction, Lusvertikimab may represent a promising novel immunotherapy option for CD127 positive ALL patients, particularly in combination with polychemotherapy standard of care. When translated into the clinic, Lusvertikimab could significantly improve ALL-therapy and the outcome of relapsed/refractory disease.” Nicolas Poirier, Chief Executive Officer of OSE Immunotherapeutics, concludes: “We are very pleased with this publication on Lusvertikimab in ‘Blood’, a high-level journal within the field of hematology whose manuscripts are reviewed by prominent specialists. Novel targeted immunotherapy options are urgently needed for B-ALL and T-ALL patients and we are happy to collaborate with the research leaders in hematology from the University of Kiel to face this clinical challenge.” The abstract, titled: “The IL-7R antagonist Lusvertikimab reduces leukemic burden in xenograft-ALL via antibody-dependent cellular phagocytosis” reported that IL-7R immunotherapy with Lusvertikimab shows significant in vivo efficacy in preclinical models using samples from B-ALL and T-ALL. Mechanistically, Lusvertikimab targeted ALL cells via a dual mode: On one hand it blocks IL-7 receptor signaling and hence block proliferative and pro-survival signals induced by Interleukin-7. In parallel, it induces leukemic cells elimination by macrophages (antibody-dependent phagocytosis), in particular with strong correlation with the level of IL-7R surface expression on leukemic cells. About Acute Lymphoblastic Leukemia (ALL) Acute lymphoblastic leukemia (ALL) is a heterogeneous group of lymphoid disorders resulting from clonal proliferation of immature lymphocytes of B-cell (85%) or T-cell (15%) lineages (3) in the blood, bone marrow, and other lymphoid organs. Although it is one of the most common cancers in children, accounting for approximately 25% of all childhood cancer diagnoses among children under 15 years of age (4), adults can also develop ALL. About 40% cases of ALL diagnosed are in adults and among them about 50% present refractory disease or undergo relapse under current conventional therapies (4). The American Cancer Society estimates that almost 6,660 new cases of ALL will be diagnosed in the United States in 2022(5). In Europe, 7,000 cases of ALL are diagnosed each year (6). The number of patients in Japan was reported to be about 5,000 in a survey by the Japanese MHLW in 2017. The number of diagnosed incident cases of acute lymphocytic leukemia (ALL) in Europe, US, Japan and China is estimated to achieve 26,482 cases in 2029(7). (1) ASH Publication – Blood (2022) 140 (Supplement 1): 1045 - 1047 (2) Lennart Lenk, PhD, Irène Baccelli, PhD, Dorothee Winterberg, PhD, Anna Dietterle, Frédérique Corallo, MD, Julien Taurelle, Emma Narbeburu*, Anna Laqua, PhD, Beat Bornhauser, PhD, Jean-Pierre Bourquin, MD, PhD, Fotini Vogiatzi, PhD, Martin Schrappe, MD, Gunnar Cario, Monika Brüggemann, MD, Nicolas Poirier, PhD and Denis Martin Schewe, MD (3)DeVita, Jr. VT, Hellman S, Rosenberg SA, eds.; Cancer: Principles and Practice of Oncology, 10th ed.; Lippincott-Raven, Philadelphia, PA; 2014. (4) Childhood Acute Lymphoblastic Leukemia Treatment (PDQ®)–Health Professional Version, accessed October 2022 (5) American Cancer Society. Key 2022 Statistics for Acute Lymphocytic Leukemia (ALL). Available at: ., accessed October 2022 (6) Gatta G, van der Zwan JM, Casali P, et al. Rare cancers are not so rare: The rare cancer burden in Europe. Eur. J. Cancer. 2011; 47: 2493-2511. (7) Global Data ABOUT OSE IMMUNOTHERAPEUTICS OSE Immunotherapeutics is a biotech company dedicated to developing first-in-class assets in immuno-oncology (IO) and immuno-inflammation (I&I). The Company’s current well-balanced first-in-class clinical pipeline includes: Tedopi® (immunotherapy activating tumor specific T-cells, off-the-shelf, neoepitope-based): this cancer vaccine is the Company’s most advanced product; positive results from the Phase 3 trial (Atalante 1) in Non-Small Cell Lung Cancer patients in secondary resistance after checkpoint inhibitor failure. Other Phase 2 trials, sponsored by clinical oncology groups, of Tedopi® in combination are ongoing in solid tumors. OSE-279 (anti-PD1): first positive results in the ongoing Phase 1/2 in solid tumors. OSE-127 - lusvertikimab (humanized monoclonal antibody antagonist of IL-7 receptor); ongoing Phase 2 in Ulcerative Colitis (sponsor OSE Immunotherapeutics); ongoing preclinical research in leukemia (OSE Immunotherapeutics). FR-104/VEL-101 (anti-CD28 monoclonal antibody): developed in partnership with Veloxis Pharmaceuticals, Inc. in transplantation; ongoing Phase 1/2 in renal transplant (sponsor Nantes University Hospital); successful Phase 1 in the US (sponsor Veloxis Pharmaceuticals, Inc.). Anti-SIRPα monoclonal antibody developed in partnership with Boehringer Ingelheim in advanced solid tumors and cardiovascular-renal-metabolic diseases (CRM); positive Phase 1 dose escalation results in monotherapy and in combination; Phase 2 in CRM diseases planned to be initiated end of 2024. ABBV-230 (ChemR23 agonist mAb) developed in partnership with AbbVie in chronic inflammation. OSE Immunotherapeutics expects to generate further significant value from its three proprietary drug discovery platforms, which are central to its ambitious goal to deliver next-generation first-in-class immunotherapies: Pro-resolutive mAb platform focused on targeting and advancing inflammation resolution and optimizing the therapeutic potential of targeting Neutrophils and Macrophages in I&I. ABBV-230 (licensed to AbbVie) is the first candidate generated by the platform, additional discovery programs ongoing on new pro-resolutive GPCRs. Myeloid Checkpoint platform focused on optimizing the therapeutic potential of myeloid cells in IO by targeting immune regulatory receptors expressed by Macrophages and Dendritic cells. BI 765063 and BI 770371 (licensed to Boehringer Ingelheim) are the most advanced candidates generated by the platform. Ongoing additional discovery programs, in particular with positive preclinical results obtained in monotherapy with new anti-CLEC-1 mAbs. BiCKI® Platform is a bifunctional fusion protein platform built on the key backbone component of anti-PD1 combined with a new immunotherapy target to increase anti-tumor efficacy by “cis-potentiating” tumor-specific T cells. A first program has been acquired by Boehringer Ingelheim. mRNA Therapeutic platform allows local delivery into the inflammatory site of innovative immunotherapies encoded by RNA to locally controls and/or suppress immune responses and inflammation. Additional information about OSE Immunotherapeutics assets is available on the Company’s website: Follow us on Twitter and LinkedIn Contacts OSE Immunotherapeutics Sylvie Détry sylvie.detry@ose-immuno.com Nicolas Poirier Chief Executive Officer nicolas.poirier@ose-immuno.com French Media: FP2COM Florence Portejoie fportejoie@fp2com.fr +33 6 07 768 283 U.S. Media Contact RooneyPartners LLC Kate Barrette kbarrette@rooneypartners.com +1 212 223 0561 Forward-looking statements This press release contains express or implied information and statements that might be deemed forward-looking information and statements in respect of OSE Immunotherapeutics. They do not constitute historical facts. These information and statements include financial projections that are based upon certain assumptions and assessments made by OSE Immunotherapeutics’ management in light of its experience and its perception of historical trends, current economic and industry conditions, expected future developments and other factors they believe to be appropriate. These forward-looking statements include statements typically using conditional and containing verbs such as “expect”, “anticipate”, “believe”, “target”, “plan”, or “estimate”, their declensions and conjugations and words of similar import. Although the OSE Immunotherapeutics management believes that the forward-looking statements and information are reasonable, the OSE Immunotherapeutics’ shareholders and other investors are cautioned that the completion of such expectations is by nature subject to various risks, known or not, and uncertainties which are difficult to predict and generally beyond the control of OSE Immunotherapeutics. These risks could cause actual results and developments to differ materially from those expressed in or implied or projected by the forward-looking statements. These risks include those discussed or identified in the public filings made by OSE Immunotherapeutics with the AMF. Such forward-looking statements are not guarantees of future performance. This press release includes only summary information and should be read with the OSE Immunotherapeutics Universal Registration Document filed with the AMF on April 30, 2024, including the annual financial report for the fiscal year 2023, available on the OSE Immunotherapeutics’ website. Other than as required by applicable law, OSE Immunotherapeutics issues this press release at the date hereof and does not undertake any obligation to update or revise the forward-looking information or statements. Attachment EN_240701_OSE-127 Blood

Clinical ResultImmunotherapyVaccinePhase 2Phase 1

30 May 2024

·www.globenewswire.com

OSE Immunotherapeutics Provides Business and Corporate Update

OSE Immunotherapeutics Provides Business and Corporate Update Three pharmaceutical agreements signed during the last three months: New strategic partnership with AbbVie for OSE-230, a novel preclinical potential first-in-class program for the treatment of chronic inflammation. Major partnership expansion with Boehringer Ingelheim: Amendment of the collaboration and licensing agreement on first-in-class SIRPα compounds already developed in immuno-oncology, now expected in Phase 2 in cardiovascular-renal-metabolic diseases later this year.New asset acquisition of a preclinical program which will be launched from the OSE’s cis- targeting anti-PD1/cytokine platform. Solid financial position to support implementation of the strategy until 2027, integrating the recent ‘France 2030’ public funding for Tedopi® pivotal clinical Phase 3 in lung cancer.Additional new experienced international executives who will support the next stages of the Company’s growth on the Board of directors will be present at the upcoming General Shareholders’ meeting. NANTES, France, May 30, 2024 – 6:15pm CET – OSE Immunotherapeutics SA (ISIN: FR0012127173; Mnemo: OSE), today provided business and corporate update after reinforcement of the Company’s business-model based on strategic pharmaceutical partnerships following the three recent new agreements concluded with AbbVie and Boehringer Ingelheim. These steps allow strategy implementation relying on both proprietary late-stage immunotherapy assets in oncology (Phase 3 in NSCLC to be launched) and inflammation (Phase 2 in Ulcerative Colitis with other potential indications), and in accelerating and strengthening first-in-class preclinical programs from its innovative discovery platforms. A strategic evolution of the Board of directors will be presented at the next General Shareholders’ meeting with seasoned pharmaceutical and global executives who will reinforce the Company’ international positioning. Nicolas Poirier, Chief Executive Officer of OSE Immunotherapeutics, comments: “We achieved major industrial partnerships from our differentiated immunological pipeline and our sustainable innovation engine. Our business-model, which is based on recurrent and strategic pharmaceutical partnerships, has been reinforced and allows us to develop our first-in-class clinical late-stage multi-products. We look forward to reaching new milestones in 2024, a transformative year for the Company with potential clinical inflection points from our proprietary and partnered assets, the anti-IL-7R monoclonal antibody Lusvertikimab in Phase 2 in Ulcerative Colitis and cancer vaccine Tedopi® in pivotal Phase 3 in Non-Small Cell Lung Cancer. We are preparing the next steps of the Company’s growth via our promising preclinical programs in immuno-inflammation and immuno-oncology.” Dominique Costantini, Chairwoman of OSE Immunotherapeutics, comments: “In just a few years, we have built a fully integrated biotech company with a rich and differentiated drug-candidate portfolio of both proprietary and partnered programs with pharmaceutical companies, highly recognized as experts in their development fields and markets. The OSE team has already delivered significant achievements and is working to discover and develop innovative immunotherapies. All these significant milestones position 2024 to be a transformational year for OSE with the ambition to become one of the key European biotechs in immunotherapy. We propose a strategic evolution of the Board of directors with both highly experienced and international pharmaceutical and financial experts who will be able to support the Company in its future strategic choice growth.” Corporate Evolution Four new independent directors will be proposed to the General Shareholders’ meeting on June 19th: Markus Goebel, MD, PhD, MBA Markus is a seasoned executive with 30+ year experience in the Life Science industry. He has deep understanding and broad hands-on experience across the entire value chain in various Pharma and Bio/Medtech positions including as a board member. Managing Director Novartis Venture Fund (2004-2019) in the United States & Europe with a top quartile track record. He is also founder & CEO of M&G Advisors GmbH (Bio-and Medtech consulting with a focus to fundraising and transactions). He completed his MBA with dissertation on innovation in the pharma industry to characterize blockbuster drugs. He is a certified MD in Oncology/Haematology (plus additional certifications) with more than 10 years in academia. Martine George, MD, M.Sc.Martine has a rich pharma and academic international expertise mainly in the United States. She is a proven leader of large development teams for global Fortune 500 pharmaceutical organizations and small biotechnology companies. She was Principal, Senior Executive consultant, Life Sciences in Global Development Associates, Inc., Skillman, NJ, a key contributor to strategies leading to multiple drug regulatory approvals or licensing/acquisitions and significant M&A. She was Vice President, Global Medical Affairs, Oncology, at Pfizer Inc., New York, NY, driving global medical strategy and worldwide medical affairs and reimbursement activities for oncology drugs. Previously, she served as Senior Vice President, Drug Development and Chief Medical Officer at GPC Biotech Inc., Princeton; Senior Vice President, Head of Oncology at Johnson & Johnson, Raritan, NJ; and Vice President, Medical Affairs at Rhone-Poulenc Rorer (Sanofi-Aventis), Collegeville, PA. She began her carreer at Sandoz Pharmaceuticals Corporation (Novartis), East Hanover, NJ, and previously at American Cyanamid Pearl River, NY. She has a strong expertise in clinical research, medical affairs, and regulatory affairs specializing in oncology and other therapeutic areas. Her extensive Board experiences were also acquired in large and small companies; in public and private (i.e Phaxiam/ Erytech/ GammaMabs/ Cytomics, Inc/ Non-for-profit organizations Breast Cancer Research Foundation, New York, NY/Ressource Center for Women & Their Families, Hillsborough, NJ). Cécile Nguyen-Cluzel:Cécile has extensive experience in financial engineering and healthcare private equity. After nearly 30 years investing in French small cap funds (Initiative & Finance, MBO +), Cécile joined the London-based pan-European fund Apposite Capital in January 2024 as Senior Advisor in healthcare for France and Europe. Over the course of her career, she has acquired specific expertise in the growth and buyout of companies (investments of between €10m and €40m) in a variety of healthcare sectors, such as diagnostics (spin-off of Cerba in 1998), healthcare services (orthoprosthetists, nuclear medicine), CROs and digital health. Cécile has regularly held positions on the strategic committees of her portfolio companies. Cécile holds a Master “Ingéniérie financière” Dauphine and the ‘Leading the digital transformation in healthcare’ certificate from Harvard medical school. Marc Dechamps Marc is a biologist with extensive experience in the pharmaceutical industry dating back more than 35 years. During his career, he has worked for corporate pharma companies including GSK & ViiVHealthcare, building his expertise in market development for new products in infectious diseases, immunological disorders, oncology, CNS disorders and vaccines. In 2016, Marc founded and became Managing Director of XMF consulting, a company which supports biotech and biopharma businesses with strategic advice. He has also served as Managing Director of Delphi Genetics (CDMO) and interim CEO of eTheRNA Immunotherapies (mRNA biotech company). Presently, he is CEO of Bioxodes, a phase 2a clinical stage biotech company (prevention of thrombosis and neuroinflammation in hemorrhagic stroke patients). He also serves also as President of the board of InvestSud Tech (group InvestSud) and board member of HealthTech for Care (HT4C). Marc is co-academic Director for the advanced masters in biotech & medtech ventures at the Solvay Brussels School of Economics & Management. Strategic announcements since early 2024 On February 28th, OSE Immunotherapeutics and AbbVie announced partnership to develop OSE-230, a novel monoclonal antibody for the treatment of chronic inflammation. OSE received a $48 million upfront payment upon signature of this strategic partnership and is eligible to receive up to $665 million potential additional milestones. On April 10th, OSE Immunotherapeutics received €8.4 million in non-dilutive public funding as part of the France 2030 “i-Démo” program to support the Phase 3 registration clinical trial of cancer vaccine Tedopi® in lung cancer. On May 24th, OSE Immunotherapeutics and Boehringer Ingelheim expanded their collaboration to develop first-in-class treatments for cancer and cardio-renal-metabolic diseases. OSE received a total €38.8 million payment after strengthening its partnership with Boehringer Ingelheim for the development of anti-SIRPα programs in oncology and cardio-renal-metabolic diseases, as well as the launch of a new preclinical asset from OSE’s cis-targeting anti-PD1/cytokine platform; and up to €1.1 billion in potential additional milestones. About OSE Immunotherapeutics OSE Immunotherapeutics is a biotech company dedicated to developing first-in-class assets in immuno-oncology (IO) and immuno-inflammation (I&I). The Company’s current well-balanced first-in-class clinical pipeline includes: Tedopi® (immunotherapy activating tumor specific T-cells, off-the-shelf, neoepitope-based): this cancer vaccine is the Company’s most advanced product; positive results from the Phase 3 trial (Atalante 1) in Non-Small Cell Lung Cancer patients in secondary resistance after checkpoint inhibitor failure. Other Phase 2 trials, sponsored by clinical oncology groups, of Tedopi® in combination are ongoing in solid tumors.OSE-279 (anti-PD1): first positive results in the ongoing Phase 1/2 in solid tumors.OSE-127 - lusvertikimab (humanized monoclonal antibody antagonist of IL-7 receptor); ongoing Phase 2 in Ulcerative Colitis (sponsor OSE Immunotherapeutics); ongoing preclinical research in leukemia (OSE Immunotherapeutics).FR-104/VEL-101 (anti-CD28 monoclonal antibody): developed in partnership with Veloxis Pharmaceuticals, Inc. in transplantation; ongoing Phase 1/2 in renal transplant (sponsor Nantes University Hospital); successful Phase 1 in the US (sponsor Veloxis Pharmaceuticals, Inc.). Anti-SIRPα monoclonal antibody developed in partnership with Boehringer Ingelheim in advanced solid tumors and cardiovascular-renal-metabolic diseases (CRM); positive Phase 1 dose escalation results in monotherapy and in combination; Phase 2 in CRM diseases planned to be initiated end of 2024.OSE-230 (ChemR23 agonist mAb) developed in partnership with AbbVie in chronic inflammation. OSE Immunotherapeutics expects to generate further significant value from its three proprietary drug discovery platforms, which are central to its ambitious goal to deliver next-generation first-in-class immunotherapies: Pro-resolutive mAb platform focused on targeting and advancing inflammation resolution and optimizing the therapeutic potential of targeting Neutrophils and Macrophages in I&I. OSE-230 (licensed to AbbVie) is the first candidate generated by the platform, additional discovery programs ongoing on new pro-resolutive GPCRs.Myeloid Checkpoint platform focused on optimizing the therapeutic potential of myeloid cells in IO by targeting immune regulatory receptors expressed by Macrophages and Dendritic cells. BI 765063 and BI 770371 (licensed to Boehringer Ingelheim) are the most advanced candidates generated by the platform. Ongoing additional discovery programs, in particular with positive preclinical results obtained in monotherapy with new anti-CLEC-1 mAbs.BiCKI® Platform is a bifunctional fusion protein platform built on the key backbone component of anti-PD1 combined with a new immunotherapy target to increase anti-tumor efficacy. Additional information about OSE Immunotherapeutics assets is available on the Company’s website: www.ose-immuno.com. Follow us on X and LinkedIn Contacts Sylvie Détrysylvie.detry@ose-immuno.comNicolas PoirierChief Executive Officer nicolas.poirier@ose-immuno.comFrench Media: FP2COMFlorence Portejoiefportejoie@fp2com.fr+33 6 07 768 283U.S. Media ContactRooneyPartners LLCKate Barrettekbarrette@rooneypartners.com +1 212 223 0561 Forward-looking statementsThis press release contains express or implied information and statements that might be deemed forward-looking information and statements in respect of OSE Immunotherapeutics. They do not constitute historical facts. These information and statements include financial projections that are based upon certain assumptions and assessments made by OSE Immunotherapeutics’ management in light of its experience and its perception of historical trends, current economic and industry conditions, expected future developments and other factors they believe to be appropriate.These forward-looking statements include statements typically using conditional and containing verbs such as “expect”, “anticipate”, “believe”, “target”, “plan”, or “estimate”, their declensions and conjugations and words of similar import. Although the OSE Immunotherapeutics management believes that the forward-looking statements and information are reasonable, the OSE Immunotherapeutics’ shareholders and other investors are cautioned that the completion of such expectations is by nature subject to various risks, known or not, and uncertainties which are difficult to predict and generally beyond the control of OSE Immunotherapeutics. These risks could cause actual results and developments to differ materially from those expressed in or implied or projected by the forward-looking statements. These risks include those discussed or identified in the public filings made by OSE Immunotherapeutics with the AMF. Such forward-looking statements are not guarantees of future performance. This press release includes only summary information and should be read with the OSE Immunotherapeutics Universal Registration Document filed with the AMF on April 30, 2023, including the annual financial report for the fiscal year 2023, available on the OSE Immunotherapeutics’ website. Other than as required by applicable law, OSE Immunotherapeutics issues this press release at the date hereof and does not undertake any obligation to update or revise the forward-looking information or statements. Attachment EN_240530 Business and corporate Updates-vf

Phase 2Executive ChangePhase 3VaccinePhase 1

27 Mar 2024

·www.globenewswire.com

OSE Immunotherapeutics Reports Full Year 2023 Financial Results and Provides Business Strategy Update

Financial highlights €18.7 million available cash as of December 31st, 2023, not including the upcoming $48 million payment as part of the recent collaboration and license partnership (February 2024) with AbbVie1, nor the €5.8 million of R&D Tax credit, providing reinforced financial visibility until 2026. Proprietary clinical pipeline highlights Tedopi®, optimized epitope-based cancer vaccine: dossier and protocol approved by the Food and Drug Administration (FDA) to launch a new confirmatory Phase 3 clinical trial in second-line lung cancer in patients with acquired/secondary resistance to anti-PD(L)1. Completion of patient enrollment in the Phase 2 in pancreatic cancer; ongoing Phase 2 in combination in ovarian cancer and lung cancer. OSE-127/Lusvertikimab, anti-IL-7 receptor monoclonal antibody: completion of patient enrollment in Phase 2 clinical trial in ulcerative colitis; top-line results expected mid-2024. Positive opinion from the European Medicines Agency (EMA) on Orphan Drug Designation for Lusvertikimab in Acute Lymphoblastic Leukemia. OSE-279, proprietary anti-PD1: positive efficacy and safety results from Phase 1/2 study in advanced solid tumors. Partnered Programs OSE-230, anti-ChemR23 agonist monoclonal antibody, in IND-enabling studies: new partnership with AbbVie ($48 million upfront, up to $665 million additional milestones) for severe and chronic inflammatory diseases. BI 765063 and BI 770371, two selective SIRPα antagonist programs in clinical development in solid tumors in partnership with Boehringer Ingelheim. FR104/VEL-101, anti-CD28 selective monoclonal antibody, developed in partnership with Veloxis Pharmaceuticals, Inc.: two clinical trials, a Phase 1/2 and a Phase 1, completed in 2023; results expected in 2024. Nantes, France – March 27, 2024, 6:00pm CET – OSE Immunotherapeutics SA (ISIN: FR0012127173; Mnemo: OSE) today reported its consolidated annual financial results for 2023 and provided an update on key proprietary clinical and preclinical achievements, on ongoing collaboration and licensing agreements, as well as on the 2024 Company’s outlook. Nicolas Poirier, Chief Executive Officer of OSE Immunotherapeutics, commented: “The Company has built today a broad and independent portfolio of five clinical assets, three pharmaceutical partnerships and three research platforms, all with potential key milestones expected in 2024. We have achieved significant steps in 2023 and all of which put in place during this year will help advance our key priorities on our clinical and preclinical stage products in immuno-oncology and inflammation in the coming months. We started 2024 with a major achievement for the Company’s growth as we also reinforced our financial resources with a new license and collaboration agreement with AbbVie valued up to $713 million, including a $48 million upfront payment, in line with our business-model of recurrent and strategic pharmaceutical partnerships. We will advance the Company’s clinical programs and continue investing in our R&D drug discovery engine to identify novel therapeutics for patients with high medical need in inflammation, autoimmune diseases and immuno-oncology. The conduct of our Tedopi® new pivotal Phase 3 clinical program in second-line non-small cell lung cancer, in patients with secondary/acquired resistance, is on track. Two dossiers were filed to the Food & Drug Administration (FDA) end of 2023: a companion test to identify HLA-A2 positive cancer patients eligible (collaboration with the company GenDx) and a clinical protocol. Both dossiers were approved mid-January 2024 and will be filed in Europe in the coming weeks. Completion of patient enrollment in the Phase 2 trial evaluating Lusvertikimab in ulcerative colitis was recently announced, and we are now eagerly looking forward to the top-line efficacy results after the induction phase and first early assessment after 6 months of therapy expected mid-2024. The ongoing Phase 1/2 trial with proprietary anti-PD1 OSE-279 in solid tumors has confirmed positive clinical efficacy results with a high anti-tumor response rate in difficult-to-treat patients. These results encourage further clinical development in the future, used in monotherapy in already identified cancer niche indications and to explore combinations with OSE drug candidates, in particular with our neo-epitope cancer vaccine. The positive interim data analysis from the FIRsT Phase 1/2 study evaluation of anti-CD28 FR104/VEL-101 in renal transplant marks a key advancement in the clinical development towards a Phase 2 trial under preparation by our partner Veloxis Pharmaceuticals. Two clinical drug-candidates, BI 765063 and BI 770371, from our selective SIRPa myeloid checkpoint technology are being evaluated by Boehringer Ingelheim in combination in cancer patients, in particular in metastatic or recurrent head and neck squamous cell carcinoma (HNSCC) and hepatocellular carcinoma (HCC). Promising results from the first Phase 1 study, with early clinical efficacy data and biomarkers predictive of response and survival, were presented at the 2023 AACR and ESMO conferences. We also look forward to generating additive value in immunology with our novel ‘pro-resolutive monoclonal antibody’ platform with additional identified GPCR targets, as well as our ‘myeloid checkpoint’ and ‘cytokine’ drug discovery platforms of which the latest updates are steadily selected for presentation at international scientific congresses. In parallel, at early research level, we keep strengthening our first-in-kind platform built at the intersection of Antibody Engineering, Data Science, Artificial Intelligence (AI) and novel RNA Therapeutics technologies to develop next-generation immunotherapy medicines modulating immune cell responses in the field of immuno-inflammation and immuno-oncology. Looking ahead to 2024, we are excited by several key clinical, preclinical and partnership milestones to advance the Company’s growth path with the involvement of our teams, experts and partners, all fully committed to innovation in service of patients”. Anne-Laure Autret-Cornet, Chief Financial Officer of OSE Immunotherapeutics, adds: “Our business-model is mostly based on recurrent and strategic partnerships with pharmaceutical companies. Thanks to the collaboration and license agreement signed with AbbVie, we strongly reinforced our financial visibility, which will allow us to pursue our investments in our proprietary clinical programs and our innovative R&D engine to increase their intrinsic value and to prepare the next wave of Company’s growth”. 2023 FINANCIAL RESULTS A meeting of the Board of Directors of OSE Immunotherapeutics was held on March 27, 2024. Following the Audit Committee opinion, the Board approved the annual and consolidated financial statements prepared under IFRS on 31 December 2023. The key figures of the 2023 consolidated annual results are reported below (and presented in the attached tables): In K€December 31, 2023December 31, 2022Current operating result(22,980)(18,392)Operating result(22,986)(18,476)Net result(23,221)(17,760)Available cash* 18,67225,620Consolidated balance sheet82,05491,781 As of December 31, 2023, the Company’s available cash totaled €18.7 million, versus €25.6 million as of December 31, 2022. In 2024, the Company will reinforce its financial position with a $48 million upfront payment as part of the global and exclusive license and collaboration on OSE-230 signed with AbbVie in February 2024 giving a financial visibility until 2026. In 2023, OSE Immunotherapeutics secured: An equity financing line with Vester Finance, set up on April 27, 2023. This financing has triggered at the end of September a capital increase of €11.6 million (without any discount on the share price at the date of signature). To supplement its financial resources and in order to extend its financial visibility until the fourth quarter of 2024, OSE Immunotherapeutics signed on 27 September 2023, an extension to this equity financing line agreement with Vester Finance, at the same conditions2. This extension, approved by the Board of Directors of September 27, 2023, acting on delegation from the general assembly meeting of shareholders of June 22, 20233, relates to a maximum of 900,000 shares of the Company, representing a maximum of 4,16% of the share capital, that Vester committed to subscribe on its own initiative, over a maximum period of 24 months, subject to certain usual contractual conditions. Assuming that the totality of this additional line of financing is used in full, a shareholder holding 1.00% of the capital of OSE Immunotherapeutics before its establishment, would see his stake increase to 0.96% of the capital on an undiluted basis4 and 0.96% of the share capital on a diluted basis5. This transaction does not give rise to the preparation of a prospectus subject to the approval of the “Autorité des Marchés Financiers”, based on Article 1 of the Prospectus Regulation granting an exemption when a transaction relates to a dilution less than 20% of the Company's share capital. The number of shares issued under this agreement and admitted to trading are communicated monthly on the Company's website. Loans and “PGE Resilience” The Company obtained the formal agreement on loans for a total amount of €5.3 million with the collective support of “La Région Pays de la Loire”, Bpifrance and its banking pool composed by banks CIC, Crédit Mutuel and BNP to finance its strategic R&D programs. Favorable conditions were granted for these loans, with an interest range of 2-4% and reimbursement timelines within 3 to 5 years. Part of these loans is composed by a “PGE Resilience” ("Prêt Garanti par l’État") loan guaranteed by the French State, implemented in the context of the Ukrainian crisis. 2023 Financial results The audit procedures on the consolidated accounts have been performed. The certification report will be issued after finalization of the procedures required for the purposes of filing the registration document.The Company recorded a consolidated operating loss of €-23.0 million. Current operating expenses were €25.2 million (versus €36.6 million in 2022) of which 74% related to R&D. R&D expenses amounted to €17.1 million versus €26.9 million in 2022. APPENDICES CONSOLIDATED PROFIT & LOSS P&L IN K€ December 31, 2023December 31, 2022 Turnover 2,22718,302 Total Revenues 2,22718,302 Research and development expenses(17,158)(26,893) Overhead expenses (6,015)(6,672) Expenses related to shares payments(2,034)(3,130) OPERATING PROFIT/LOSS - CURRENT(22,980)(18,392) Other operating expenses (6)(84) OPERATING PROFIT/LOSS (22,986)(18,476) Financial products 2,1772,079 Financial expenses (2,412)(1,624) PROFIT/LOSS BEFORE TAX (23,221)(18,022) Income Tax 219263 NET PROFIT/LOSS (23,003)(17,760) Of which consolidated net result attributable to shareholders(23,003)(17,760) Net earnings attributable to shareholders Weighted average number of shares outstanding19,562,14718,527,401 Basic earnings per share(1.18)(0.96) Diluted earnings per share(1.18)(0.96) IN K€ 20232022 NET RESULT (23,003)(17,760) Amounts to be recycled in the income statement: Currency conversion difference(77)(61) Amounts not to be recycled in the income statement: (9)122Other comprehensive income in the period(86)(61) GLOBAL PROFIT/LOSS (23,089)(17,699) CONSOLIDATED BALANCE SHEET ASSETS IN K€ December 31, 2023December 31, 2022Acquired R&D costs 46,40148,784Tangible assets 464743Right-of-use assets 3,6064,236Financial assets 910635Differed tax assets 195182TOTAL NON-CURRENT ASSETS51 ,57654,581Trade receivables 982403Other current assets 10,82411,177Cash and cash equivalents 18,67225,620TOTAL CURRENT ASSETS30,47837,200TOTAL ASSETS 82,05491,781 EQUITY & LIABILITIES IN K€ December 31, 2023December 31, 2022 SHAREHOLDERS’ EQUITY Stated capital 4,3303,705 Share premium 49,81638,784 Merger premium 26,82726,827 Treasury stock (408)(549) Reserves and retained earnings(34,587)(18,349) Consolidated result(23,003)(17,760)TOTAL SHAREHOLDERS’ EQUITY 22,97532,658NON-CURRENT DEBTS Non-current financial liabilities35,50837,231 Non-current lease liabilities3,0323,586 Non-current deferred tax liabilities 1,3111,514 Non-current provisions 429524TOTAL NON-CURRENT DEBTS 40,28042,856 CURRENT DEBTS Current financial liabilities6,4033,093Current lease liabilities858883 Trade payables9,2998,539 Corporate income tax liabilities 2021 Social and tax payables1,8672,916 Other debts and accruals 351816TOTAL CURRENT DEBTS18,79916,268 TOTAL LIABILITIES82,05491,781 CONSOLIDATED CASH FLOW STATEMENTS In K€December 31, 2023December 31, 2022 CONSOLIDATED RESULT (23,003)(17,760) +/- Depreciation, amortization and provision expenses 2,5742,744+Amortization on "right-of-use" 846742 +/- Shares based payments (1) 1,7462,728 CASH FLOW BEFORE TAX (17,838)(11,545) +Financial charges (657)(3,066)-Income tax expenses (219)(263)-Tax paid (216)(236) +/- Working capital variation (2) (835)(3,142)CASH FLOW FROM OPERATING ACTIVITIES (A)(19,764)(18,252) -Tangible assets increase (16)(274) +/- Financial assets variation 00 +/- Net variation in rights-of-use(216)0 +/- Loans and advances variation (275)300CASH FLOW FROM INVESTING ACTIVITIES (B)(507)26 + Capital increase (including share premium) 11,357 +/- Own shares transactions 0 + Warrant subscription 300 + Loan subscription 5,02312,056 - Loan repayment (2,719)(1,010) - Lease debt repayment (3) (637)(785) - Financial charges CASH FLOW FROM FINANCING ACTIVITIES (C)13,32410,267 +/- Currency translation transactions (D) CASH VARIATION E = (A + B + C + D)(6,948)(7,959) CASH OPENING BALANCE (F) 25,62033,579 CASH CLOSING BALANCE (G) 18,67225,620 DIFFERENCE: E (G-F) 0 Warrants and free shares awards granted in 2023 and valuated for 1,746 K€ Mainly explained by: Increase in trade receivable for 578 K€ Decrease in other current assets for 353 K€ Increase in trade accounts payable for 759K€ Decrease in social and tax payable for 1,048 K€ Decrease in other debts for 464 K€ Explained by IFRS16 application, which corresponds to reimbursement of lease debt for 637 K€ ABOUT OSE IMMUNOTHERAPEUTICSOSE Immunotherapeutics is a biotech company dedicated to developing first-in-class assets in immuno-oncology (IO) and immuno-inflammation (I&I). The Company’s current well-balanced first-in-class clinical pipeline includes: Tedopi® (immunotherapy activating tumor specific T-cells, off-the-shelf, neoepitope-based): this cancer vaccine is the Company’s most advanced product; positive results from the Phase 3 trial (Atalante 1) in Non-Small Cell Lung Cancer patients in secondary resistance after checkpoint inhibitor failure. Other Phase 2 trials, sponsored by clinical oncology groups, of Tedopi® in combination are ongoing in solid tumors. OSE-279 (anti-PD1): first positive results in the ongoing Phase 1/2 in solid tumors. OSE-127 - lusvertikimab (humanized monoclonal antibody antagonist of IL-7 receptor); ongoing Phase 2 in Ulcerative Colitis (sponsor OSE Immunotherapeutics); ongoing preclinical research in leukemia (OSE Immunotherapeutics). FR-104/VEL-101 (anti-CD28 monoclonal antibody): developed in partnership with Veloxis Pharmaceuticals, Inc. in transplantation; ongoing Phase 1/2 in renal transplant (sponsor Nantes University Hospital); successful Phase 1 in the US (sponsor Veloxis Pharmaceuticals, Inc.). BI 765063 and BI 770371 (anti-SIRPα monoclonal antibody on CD47/SIRPα pathway) developed in partnership with Boehringer Ingelheim in advanced solid tumors; positive Phase 1 dose escalation results in monotherapy and in combination, in particular with anti-PD-1 antibody ezabenlimab; international Phase 1b ongoing clinical trial in combination with ezabenlimab alone or with other drugs in patients with recurrent/metastatic head and neck squamous cell carcinoma (HNSCC) and hepatocellular carcinoma (HCC). OSE-230 (ChemR23 agonist mAb) developed in partnership with AbbVie in chronic inflammation. OSE Immunotherapeutics expects to generate further significant value from its three proprietary drug discovery platforms, which are central to its ambitious goal to deliver next-generation first-in-class immunotherapies: Pro-resolutive mAb platform focused on targeting and advancing inflammation resolution and optimizing the therapeutic potential of targeting Neutrophils and Macrophages in I&I. OSE-230 (licensed to AbbVie) is the first candidate generated by the platform, additional discovery programs ongoing on new pro-resolutive GPCRs. Myeloid Checkpoint platform focused on optimizing the therapeutic potential of myeloid cells in IO by targeting immune regulatory receptors expressed by Macrophages and Dendritic cells. BI 765063 and BI 770371 (licensed to Boehringer Ingelheim) are the most advanced candidates generated by the platform. Ongoing additional discovery programs, in particular with positive preclinical results obtained in monotherapy with new anti-CLEC-1 mAbs. Cytokine platform focused on leveraging the Cis-Delivery of cytokine in IO and I&I. BiCKI® is a bispecific fusion protein platform built on the key backbone component of anti-PD1 combined with a new immunotherapy target to increase anti-tumor efficacy. BiCKI®-IL-7v is the most advanced BiCKI® candidate targeting anti-PD1xIL-7. Ongoing additional discovery programs on Cis-Demasking technologies.For more information on Ose Immunotherapeutics : http://ose-immuno.comFollow us on Twitter and Linkedinhttps://twitter.com/i/flow/login?redirect_after_login=%2FOSEIMMUNOhttps://www.linkedin.com/company/ose-immunotherapeutics/ Contacts OSE ImmunotherapeuticsSylvie Détrysylvie.detry@ose-immuno.com Nicolas PoirierChief Executive Officer nicolas.poirier@ose-immuno.com French Media: FP2COMFlorence Portejoiefportejoie@fp2com.fr+33 6 07 768 283 U.S. Media ContactRooneyPartners LLCKate Barrettekbarrette@rooneypartners.com+1 212 223 0561 Forward-looking statementsThis press release contains express or implied information and statements that might be deemed forward-looking information and statements in respect of OSE Immunotherapeutics. They do not constitute historical facts. These information and statements include financial projections that are based upon certain assumptions and assessments made by OSE Immunotherapeutics’ management in light of its experience and its perception of historical trends, current economic and industry conditions, expected future developments and other factors they believe to be appropriate.These forward-looking statements include statements typically using conditional and containing verbs such as “expect”, “anticipate”, “believe”, “target”, “plan”, or “estimate”, their declensions and conjugations and words of similar import. Although the OSE Immunotherapeutics management believes that the forward-looking statements and information are reasonable, the OSE Immunotherapeutics’ shareholders and other investors are cautioned that the completion of such expectations is by nature subject to various risks, known or not, and uncertainties which are difficult to predict and generally beyond the control of OSE Immunotherapeutics. These risks could cause actual results and developments to differ materially from those expressed in or implied or projected by the forward-looking statements. These risks include those discussed or identified in the public filings made by OSE Immunotherapeutics with the AMF. Such forward-looking statements are not guarantees of future performance. This press release includes only summary information and should be read with the OSE Immunotherapeutics Universal Registration Document filed with the AMF on May 2, 2023, including the annual financial report for the fiscal year 2022, available on the OSE Immunotherapeutics’ website. Other than as required by applicable law, OSE Immunotherapeutics issues this press release at the date hereof and does not undertake any obligation to update or revise the forward-looking information or statements. 1 The transaction is subject to the satisfaction of customary closing conditions, including the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act. 2 These conditions are described in the Company's press release dated April 27, 2023. The shares will therefore be issued on the basis of the lowest average daily price weighted by volumes over the period of the two trading sessions preceding each issue, reduced a maximum discount of 6%, in compliance with the price rule and the ceiling set by the general meeting. Under the terms of the delegation granted by the general meeting, the issue price of the shares must be "at least equal to the weighted average of the prices of the last three trading sessions preceding the fixing of the issue price, possibly reduced by a maximum discount of 20%”. 3 21st resolution: delegation of capital increase with elimination of shareholders' preferential subscription rights for the benefit of categories of people meeting specific characteristics. Vester Finance falls well into the targeted category as a regular investor in so-called “small cap” growth companies, particularly in the health or biotechnology sector. 4 Based on the 21,651,401 shares issuable upon exercise of the dilutive instruments issued by the Company to date. 5 Based on the 1,830,000 shares that may be issued upon exercise of the dilutive instruments issued by the Company to date. Attachment EN_240327_Annual results_VF

License out/inPhase 1Phase 2VaccineClinical Result

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Indication	Highest Phase	Country/Location	Organization	Date
Primary Sjögren's syndrome	Phase 2	US	Adir SRL	03 Aug 2021
Primary Sjögren's syndrome	Phase 2	AU	Adir SRL	03 Aug 2021
Primary Sjögren's syndrome	Phase 2	FR	Adir SRL	03 Aug 2021
Primary Sjögren's syndrome	Phase 2	DE	Adir SRL	03 Aug 2021
Primary Sjögren's syndrome	Phase 2	HU	Adir SRL	03 Aug 2021
Primary Sjögren's syndrome	Phase 2	ES	Adir SRL	03 Aug 2021
Primary Sjögren's syndrome	Phase 2	GB	Adir SRL	03 Aug 2021
Colitis, Ulcerative	Phase 2	BY	OSE Immunotherapeutics SA	02 Oct 2020
Colitis, Ulcerative	Phase 2	BE	OSE Immunotherapeutics SA	02 Oct 2020
Colitis, Ulcerative	Phase 2	BG	OSE Immunotherapeutics SA	02 Oct 2020

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Study	Phase	Population	Analyzed Enrollment	Group	Results	Evaluation	Publication Date


NCT04605978 (CTgov)	Phase 2	Primary Sjögren's syndrome	48	S95011 concentrate for solution for infusion (S95011 Concentrate for Solution for Infusion)	lbyzpcaboi(hyshwswjxb) = ytkmazqona sjmrnaqrey (wlrcidnyia, tmjzvtgndy - lefjaqtfpa) View more	-	23 Apr 2024
				Placebo concentrate for solution for infusion (S95011 Placebo Concentrate for Solution for Infusion)	lbyzpcaboi(hyshwswjxb) = dloztkpbcs sjmrnaqrey (wlrcidnyia, figjzzakah - bsrarulljk) View more

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