IL-13R

Updated clinical results to be presented from the ongoing Phase 1/2 ABILITY-1 study of MDNA11 in advanced or metastatic solid tumors Preclinical data on MDNA113, Medicenna's first-in-class, masked, tumor-targeted bifunctional anti-PD1-IL-2 Superkine, and on its IL-2 agonists in glioblastoma, will also be presented TORONTO and HOUSTON, Oct. 04, 2024 (GLOBE NEWSWIRE) -- Medicenna Therapeutics Corp. (“Medicenna” or the “Company”) (TSX: MDNA, OTCQB: MDNAF), a clinical-stage immunotherapy company focused on the development of Superkines, announced today that it will present three posters at the 39th Annual Meeting of the Society for Immunotherapy of Cancer (“SITC”), taking place from November 6 – 10, 2024 in Houston, Texas. The Company will present updated clinical data from the ongoing Phase 1/2 ABILITY-1 Study evaluating MDNA11, a long-acting ‘beta-enhanced not-alpha’ interleukin-2 (“IL-2”) super-agonist, as both a monotherapy and in combination with pembrolizumab (KEYTRUDA®) in patients with advanced or metastatic solid tumors. In addition, new pre-clinical data on the Company’s MDNA113, a novel first-in-class, masked, tumor-targeted bifunctional anti-PD1-IL-2 Superkine, and on Medicenna’s IL-2 agonists in glioblastoma, will also be presented at the conference. Details for the poster presentations are as follows: Title: Results from ABILITY-1 monotherapy dose escalation and ongoing monotherapyexpansion with MDNA11, a long-acting ‘beta-enhanced not-alpha’ IL-2 Superkine, in patientswith advanced solid tumorsAbstract Number: 684Presentation Date: Saturday, November 9, 2024 Title: MDNA113 is a conditionally activatable anti-PD1-IL-2SK with a removable IL-13 dual masking/tumor-targeting domain to limit systemic immune stimulation while maximizing anti-tumor responseAbstract Number: 961Session Date: Friday, November 8, 2024 Title: Stimulation of IL-2 signaling with highly selective IL-2R agonists enhances immuneeffector cell response in mouse and patient-derived glioblastomasAbstract Number: 963Session Date: Friday, November 8, 2024 The full text of the abstracts will be available on the SITC 2024 website. Following the conclusion of the SITC 2024 Meeting, a copy of the posters will be available on the “Scientific Presentations” page of Medicenna’s website. About MDNA11 MDNA11 is an intravenously administered, long-acting ‘beta-enhanced not-alpha’ IL-2 Superkine specifically engineered to overcome the shortcomings of aldesleukin and other next generation IL-2 variants by preferentially activating immune effector cells (CD8+ T and NK cells) responsible for killing cancer cells, with minimal or no stimulation of immunosuppressive Tregs. These unique proprietary features of the IL-2 Superkine have been achieved by incorporating seven specific mutations and genetically fusing it to a recombinant human albumin scaffold to improve the pharmacokinetic (PK) profile and pharmacological activity of MDNA11 due to albumin’s natural propensity to accumulate in highly vascularized sites, in particular tumor and tumor draining lymph nodes. MDNA11 is currently being evaluated in the Phase 1/2 ABILITY-1 study as both a monotherapy and in combination with pembrolizumab (KEYTRUDA®). About the ABILITY-1 Study The ABILITY-1 study (NCT05086692) is a global, multi-center, open-label study that assesses the safety, tolerability, pharmacokinetics, pharmacodynamics and anti-tumor activity of MDNA11 as monotherapy or in combination with pembrolizumab (KEYTRUDA®). In the combination dose escalation of the Phase 2 study, approximately 6-12 patients are expected to be enrolled and administered ascending doses of MDNA11 intravenously once every two weeks in combination with pembrolizumab. This portion of the study includes patients with a wide range of solid tumors with the potential for susceptibility to immune modulating therapeutics. Upon identification of an appropriate dose regimen for combination, the study will proceed to a combination dose expansion cohort. About MDNA113 MDNA113 is a novel, first-in-class tumor-targeted and tumor-activated bi-functional anti-PD1-IL2 Superkine with exceptionally high affinity for IL-13Rα2 without binding to the functional IL-13R⍺1. IL-13Rα2 is overexpressed in a wide range of solid tumors, including cold tumors with minimal to no expression in normal tissues. IL-13Rα2 expressing tumors also have abundant matrix metalloprotease in the tumor microenvironment that may efficiently activate MDNA113. IL-13Rα2 expression is associated with poor clinical outcome in multiple tumor types including prostate cancer, pancreatic cancer, ovarian cancer, liver cancer, breast cancer and brain cancer, with an annual world-wide incidence of over 2 million. About Medicenna Therapeutics Medicenna is a clinical-stage immunotherapy company focused on developing novel, highly selective versions of IL-2, IL-4 and IL-13 Superkines and first-in-class Empowered Superkines. Medicenna’s long-acting IL-2 Superkine, MDNA11, is a next-generation IL-2 with superior affinity toward CD122 (IL-2 receptor beta) and no CD25 (IL-2 receptor alpha) binding, thereby preferentially stimulating cancer-killing effector T cells and NK cells. Medicenna’s IL-4 Empowered Superkine, bizaxofusp (formerly MDNA55), has been studied in 5 clinical trials enrolling over 130 patients, including a Phase 2b trial for recurrent GBM, the most common and uniformly fatal form of brain cancer. Bizaxofusp has obtained FastTrack and Orphan Drug status from the FDA and FDA/EMA, respectively. Medicenna’s early-stage high-affinity IL-2β biased IL-2/IL-15 Super-antagonists, from its MDNA209 platform, are being evaluated as potential therapies for autoimmune and graft-versus host diseases. Medicenna’s early-stage BiSKITs™ (Bifunctional SuperKine ImmunoTherapies) and the T-MASK™ (Targeted Metalloprotease Activated SuperKine) programs are designed to enhance the ability of Superkines to treat immunologically “cold” tumors. For more information, please visit www.medicenna.com, and follow us on Twitter and LinkedIn. KEYTRUDA® is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA. Forward-Looking Statements This news release contains forward-looking statements within the meaning of applicable securities laws. Forward-looking statements include, but are not limited to, express or implied statements regarding the future operations of the Company, estimates, plans, strategic ambitions, partnership activities and opportunities, objectives, expectations, opinions, forecasts, projections, guidance, outlook or other statements that are not historical facts, such as statements on the therapeutic potential and safety profile of MDNA11 and MDNA113. Drug development and commercialization involve a high degree of risk, and only a small number of research and development programs result in commercialization of a product. Results in early-stage pre-clinical or clinical studies may not be indicative of full results or results from later stage or larger scale clinical studies and do not ensure regulatory approval. You should not place undue reliance on these statements, or the scientific data presented. Forward-looking statements are often identified by terms such as “will”, “may”, “should”, “anticipate”, “expect”, “believe”, “seek”, “potentially” and similar expressions. and are subject to risks and uncertainties. There can be no assurance that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Company’s expectations include the risks detailed in the latest annual information form of the Company and in other filings made by the Company with the applicable securities regulators from time to time in Canada. The reader is cautioned that assumptions used in the preparation of any forward-looking information may prove to be incorrect. Events or circumstances may cause actual results to differ materially from those predicted, as a result of numerous known and unknown risks, uncertainties, and other factors, many of which are beyond the control of the Company. The reader is cautioned not to place undue reliance on any forward-looking information. Such information, although considered reasonable by management, may prove to be incorrect and actual results may differ materially from those anticipated. Forward-looking statements contained in this news release are expressly qualified by this cautionary statement. The forward-looking statements contained in this news release are made as of the date hereof and except as required by law, we do not intend and do not assume any obligation to update or revise publicly any of the included forward-looking statements. This news release contains hyperlinks to information that is not deemed to be incorporated by reference in this new release. Investor/Media Contact: Christina CameronInvestor Relations, Medicenna Therapeutics(647) 953-0673ir@medicenna.com

OTC2024类器官前沿应用与3D细胞培养论坛圆满落幕，点击图片可查看会后报告，咨询OTC2025类器官论坛请联系：王晨 180 1628 8769 随着对自免发病机制的了解，靶向炎性细胞因子、免疫细胞和细胞内激酶的生物药和小分子抑制剂已成为治疗自免疾病的标准手段，也成了创新药竞相争夺的一块肥肉！ 图注：部分已上市产品的获批适应症布局（人工整理，累惨本猫，或有偏颇，持续修订） 今天我们聊一聊自免领域能够成药的靶点，都有哪些？ 01 细胞因子 1.1 TNF TNF是一种主要由髓系细胞和活化T细胞分泌促炎细胞因子，和多种自免疾病的发病有关。 阻断TNF通路可以对多种自免疾病起到治疗作用，包括，类风关（RA）RA、幼年特发性关节炎（JIA）、强直性脊柱炎（AS）、银屑病和银屑病关节炎（PsA）等。 而这个靶点也造就了曾经的全球“药王”阿达木单抗！除此外还有多款该靶点药物获得FDA批准，相关药物以及批准适应症情况如下表： 1.2 IL-17 IL-17A，通常称为IL-17，是Th17细胞亚群的标志性细胞因子，关于靶点的基本介绍在我们之前的文章也有写过（在文后有统一的合集，欢迎感兴趣的读者查看）。 来自动物和临床研究的证据表明，IL-23/IL-17轴是多种自身免疫性疾病（如AS、PsA和RA）的治疗靶标。目前靶向IL-17药物包括，IL-17A（苏金单抗和依奇珠单抗）和IL-17RA（Brodalumab）等。 1.3 IL-23 IL-23作为IL-12家族的一员，是一种由DC和活化的巨噬细胞分泌的促炎细胞因子。IL-23和IL-12共用p40 亚基，但IL-23更广泛地参与自身免疫性疾病的发病机制。 通过靶向IL-12/IL-23p40或IL-23p19，可以阻断IL-23信号。IL-23的阻断可有效治疗银屑病和PsA。 从目前上市的药物看，靶向IL-12/IL-23p40抗体药物为乌司奴单抗，可阻断IL-12和IL-23；靶向IL-23p19的药物包括：Guselkumab、Tildrakizumab、Risankizumab和Mirikizumab，这些药物仅抑制IL-23。 1.4 IL-1 IL-1家族包括IL-1α和IL-1β，是和先天免疫反应密切相关的促炎细胞因子。IL-1和受体的结合，需要IL-1R1与IL-1R3形成异源三聚体，随后募集髓MYD88，并触发随后的激酶级联反应，从而促进炎症反应。 目前研究认为在自免中IL-1β比IL-1α更重要。靶向IL-1的药物已有3种被批准：Canakinumab和Gevokizumab，这两种抗体药均靶向IL-1β；Anakinra，重组IL-1受体拮抗剂；Rilonacept，IL-1R1-Fc融合蛋白。 抗IL-1疗法更广泛地用于自身炎症性疾病，如全身性 JIA、AOSD和 CAPS。其他具有高炎症负荷的疾病，如痛风和复发性心包炎，也可通过 IL-1 靶向治疗进行控制。 另外，由于IL-1在炎症性疾病中的广泛作用，IL-1阻断有望在治疗顽固性自身免疫性疾病（包括SLE和系统性硬化症）及控制过度的促炎反应（如细胞因子释放综合征和巨噬细胞活化综合征）方面提供临床益处。 1.5 IL-6 IL-6是一种多效细胞因子，由各种类型细胞在感染、炎症和恶性肿瘤的情况下产生。 IL-6在生理和病理条件下具有多种生物学功能。生理状态下，IL-6负责巨噬细胞分化为M2状态，通过成骨细胞RANK配体表达的增加进行破骨细胞生成，及通过肝脏中的JAK-STAT通路进行急性期反应。 病理（炎症）条件下，IL-6 通过调节FOXP3、RORC和IL-23R表达，参与Th17分化，同时IL-6对滤泡辅助性T细胞的发育和B细胞的成熟也很重要。 阻断IL6通路可以通过靶向IL-6、IL-6R、gp130、JAK和STAT3来实现。这其中由于副作用，gp130和STAT3无法成药。目前抗IL-6抗体、抗IL-6R抗体和JAK抑制剂已被批准用于自免疾病的治疗。 经典的IL-6抗体药物托珠单抗，目前被批准用于治疗RA、JIA、AOSD、巨细胞动脉炎和细胞因子释放综合征。 1.6 I型IFN I型IFN，包括IFN-α、IFN-β、IFN-ε、IFN-κ和IFN-ω。研究表明，IFN-α在自身免疫性疾病，尤其是SLE的发病机制中起着至关重要的作用，IFN-α以外的IFN 的作用尚不清楚。 在SLE中，IFN-α通过刺激髓系DC、Th1细胞和B细胞及抑制Treg细胞来促进促炎反应，使用重组IFN-α治疗后产生的SLE样综合征的发展也表明 1 型IFN 在自身免疫性疾病中的病理作用。 IFN-α在SLE中的病理生理学意义,使得导致了I型IFN靶向免疫治疗的发展。Rontalizumab和Sifalimumab是靶向IFN-α的抗体，但在SLE中未能控制疾病活动。 02 靶向B细胞 随着对B细胞功能的研究，B细胞被认为是自身免疫性疾病的积极参与者。B细胞耗竭疗法在RA和多发性硬化症（MS）中的成功也证明了B细胞在自免中的病理意义。 除了在抗体产生中发挥作用外，B细胞还通过抗原呈递、三级淋巴组织的形成和细胞因子（如IL-6、TNF、IFN-γ和GM-CSF）的产生参与到自身免疫中。 2.1 CD20 CD20仅在pro-B细胞到记忆B细胞谱系中表达，不在浆细胞中表达。过去几十年，抗CD20疗法一直是B细胞耗竭的主要工具。 利妥昔单抗是一种靶向CD20的嵌合抗体，可有效消除 CD20+ B细胞，耗尽分泌自身抗体的浆母细胞的细胞来源，并阻止不依赖抗体的B细胞功能，从而减轻自身免疫性炎症，已经在RA和MS中获得临床试验的成功。 除利妥昔单抗外，多种具有不同结合表位、不同给药途径和效果的抗CD20药物在开发中。其中Ocrelizumab和Ofatumumab是人源化抗CD20 抗体，已被批准用于复发性MS。 2.2 CD19 CD19在CD20+ B 细胞以及 CD20- 浆母细胞和一些浆细胞上表达，可以起到针对抗 CD20 治疗耐药的B 细胞耗竭作用。 人源化抗CD19抗体Inebilizumab已经被批准用于治疗视神经脊髓炎谱系疾病，并且正在进行临床试验以治疗其他炎症性神经系统疾病。 2.3 B细胞活化靶点 抑制B细胞的另一种方法是阻断与B 细胞成熟和存活密切相关的因子这包括：BAFF受体（BAFF-R），在除浆细胞外的大多数B 细胞亚群上表达；B细胞成熟抗原（BCMA），在浆母细胞和浆细胞上表达。 贝利尤单抗是一种人源化抗BAFF抗体药物，是FDA批准的用于SLE的第一个靶向免疫疗法。然而，贝利尤单抗并不对所有SLE患者具有疗效。Ianalumab是一种抗BAFF-R的单克隆抗体，在原发性干燥综合征（pSS）患者的II期试验中显示出有希望的结果。 Telitacicept是一种TACI-Ig融合蛋白，基于其对BAFF/APRIL系统的抑制作用，也正在临床开发中。 03 靶向T细胞 作为适应性免疫的关键参与者，T细胞在自身免疫的发生和发展中起着关键作用。因此靶向T细胞也是自免靶向药物开发的重要考量因素。 3.1 CD28 CD28信号通过激活MAPK、AKT和NF-κB通路激活T细胞。 CTLA-4是CD28的负反馈调节因子通过占据 CD80 和CD86 来抑制 CD28 信号传导。基于CTLA-4的负向调节，设计了CTLA4 胞外结构域和IgG Fc 区（阿巴西普，CTLA4-Ig）组成的融合蛋白，目前阿巴西普已经被批准用于治疗RA 和 JIA，已证实对控制炎症性关节炎有效。 其它类似药物还包括Belatacept 和MEDI5256，正处于临床研究阶段。 3.2 CD40 CD40通路是T细胞的主要激活信号，与CD40L连接后，上调CD80和 CD86 表达。活化T 细胞的CD40L与靶细胞CD40结合时，多个激酶级联反应会激活转录因子，如NF-κB和AP1，以诱导细胞存活、增殖和分化。 CD40信号转导对于参与T 细胞依赖的抗体产生、生发中心形成和记忆 B 细胞分化的B 细胞-T 细胞相互作用尤为重要。 由于其在 B 细胞功能中的关键作用，靶向CD40 信号转导的治疗潜力已在临床前和临床研究中得到研究。Iscalimab（一种人源化抗 CD40 mAb）最近的II 期试验显示pSS 患者的临床改善，随后的 III 期试验正在进行中。 3.3 其它 靶向其他共刺激信号转导的免疫疗法，如ICOS和OX40 通路，也正在开发中，以抑制自身免疫性疾病中的 T 细胞效应功能。 作为在活化的CD4+ T 细胞上表达的共刺激分子，ICOS和OX40参与T细胞的存活、分化和活化。 04 激酶靶向治疗 JAK家族由JAK1、JAK2、JAK3和TYK2组成，与细胞因子受体（包括IL-2R、IL-4R、IL-5R、IL-6R、IL-13R 和1型IFN）、生长激素和促红细胞生成素有关。 由于JAK在细胞因子通路的关键作用，JAK抑制剂已经被批准用于RA、PsA和溃疡性结肠炎。 除JAK抑制剂外，布鲁顿酪氨酸激酶（BTK）抑制剂也有望通过调节 B 细胞功能来改善自身免疫性炎症。目前正在研究 BTK 抑制剂在各种自身免疫性疾病中的应用，包括 RA、MS、pSS 和SLE。 05 结论 过去几十年，靶向免疫药物的进步彻底改变了自免疾病患者的治疗和临床结果。 目前的靶向免疫疗法通过阻断炎性细胞因子、细胞表面分子和细胞内激酶来抑制主要的促炎信号通路。尽管靶向治疗在自身免疫性疾病中取得了巨大成功，但在药物疗效和长期安全性方面仍未满足医疗需求。 除了阻断炎症通路外，未来的疗法还旨在诱导长期的免疫耐受，同时保持保护性免疫功能。希望生物技术的进步和疾病知识将为开发具有更高治疗效果和最小不良反应的新药提供机会。 END 免责声明：本文仅作知识交流与分享及科普目的，不涉及商业宣传，不作为相关医疗指导或用药建议。文章如有侵权请联系删除。 OTC2024类器官前沿应用与3D细胞培养论坛圆满落幕，点击图片可查看会后报告，咨询OTC2025类器官论坛请联系：王晨 180 1628 8769

MDNA209 is a first-in-class “beta-enhanced” IL-2 Super-antagonist being developed for the potential treatment of autoimmune diseases, a disorder attributed to an imbalance of the immune system and affecting 5 to 10% of the global population MDNA209 restores immune balance by selectively blocking IL-2Rβγc, a receptor highly expressed by effector CD8 T cells which are known to promote tissue damage in autoimmune diseases In an aggressive animal model of graft versus host disease (GvHD) MDNA209 was able to extend overall survival by 400 percent, reduce weight loss and improve clinical scores, highlighting its therapeutic potential for treating GvHD and autoimmune diseases MDNA113 is an IL-13Rα2 tumor-targeted BiSKIT (Bifunctional SuperKine for ImmunoTherapy) which delivers an anti-PD1-IL-2 Superkine (anti-PD1-IL-2SK) directly to the tumor microenvironment (TME) where it is conditionally activated by tumor-associated proteases MDNA113’s efficacy was significantly enhanced in mice harboring tumors engineered to overexpress IL-13Rα2, highlighting its potential to treat immunologically “cold tumors” such as pancreatic, prostate, ovarian, and breast cancers that globally affect over two million patients every year TORONTO and HOUSTON, Sept. 09, 2024 (GLOBE NEWSWIRE) -- Medicenna Therapeutics Corp. (“Medicenna” or the “Company”) (TSX: MDNA, OTCQB: MDNAF), a clinical-stage immunotherapy company focused on the development of Superkines, announced today that, as planned and previously announced, new data from two of its preclinical programs were presented orally at the Promise of Interleukin-2 Conference held in Paris, France from September 4-7, 2024. “Inspired by the promising Phase 1/2 clinical results from the ABILITY-1 clinical trial of MDNA11, we are leveraging the same IL-2 Superkine platform to advance our pipeline of transformative medicines to treat not only cancer but also autoimmune diseases,” said Fahar Merchant, Ph.D., President and CEO of Medicenna. “We are encouraged by these preclinical data, which validates the versatility of our IL-2 Superkines beyond cancer as we further evaluate MDNA209 in GvHD and other disease models. Additionally, our IL-13 Superkines enable us to precisely deliver and localize BiSKITs to the tumor site which could potentially benefit patients with cancers that have not responded to currently approved checkpoint inhibitors, thereby addressing a huge unmet need.” MDNA209 and MDNA113 are preclinical assets based on the MDNA109 platform also used to develop MDNA11, a long-acting IL-2 Super-agonist, currently being evaluated in the Phase 1/2 ABILITY-1 clinical trial for the treatment of solid tumors. The first presentation outlined the potential of MDNA209 to treat autoimmune diseases, including high grade GvHD which has a 1-year survival rate of only 40%. Transplant patients with GvHD experience significant morbidity and mortality with limited therapeutic options to prolong survival. The initial preclinical data presented on the MDNA209 platform highlight the potential of the Company’s long-acting, high-affinity IL-2β biased IL-2/IL-15 Super-antagonists to downregulate the immune system, with therapeutic potential for GvHD and autoimmune diseases.The second presentation focused on MDNA113, which is being developed as a novel, targeted and bifunctional version (anti-PD1-IL-2 Superkine fusion) of a class of blockbuster anti-PD1 therapies, with current annual sales of over $30 billion but lose patent protection from 2028 onwards. Although Anti-PD-1 checkpoint blockade has improved survival outcomes in many types of solid tumors, approximately 70% of cancer patients do not benefit. To further improve patient outcomes, Medicenna has designed an anti-PD1-IL-2SK BiSKIT that uses an IL-13 Superkine to simultaneously target and localize the BiSKIT to the TME while masking the IL-2 domain during peripheral circulation and reducing its toxicity. At the TME, tumor specific proteases cleave the IL-13 component, releasing the BiSKIT to engage with T-cells thereby stimulating T-cell activity via the IL-2 domain and preventing T-cell exhaustion via the anti-PD1 domain. Key highlights from the presentations are: MDNA209, a High Affinity IL-2β Biased IL-2/IL-15 Super-antagonist, for the Treatment of Autoimmune Diseases MDNA209 is an IL-2 Super-antagonist with enhanced affinity for IL-2Rβ but does not engage with the γc subunit, therefore acting as a receptor clamp to exclude native IL-2 as well as native IL-15.MDNA209 is fused to an Fc scaffold (MDNA209-Fc) to extend its in vivo half-life, reducing the need for frequent dosing.MDNA209-Fc inhibits both, IL-2 and IL-15 induced p-STAT5 signaling, reduces IFNγ release and slows immune cell proliferation without reducing Treg population.In an aggressive animal model of acute GvHD, MDNA209 was able to extend overall survival by 400 percent, reduce weight loss and improve clinical scores. MDNA113, an IL-13Rα2 Tumor Targeting and Conditionally Activatable anti-PD1-IL-2SK BiSKIT Shows Enhanced Safety and Potent Therapeutic Efficacy MDNA113 (masked version) showed reduced capacity to induce IL-2R mediated pSTAT5 signaling compared to anti-PD1-IL-2SK (non-mask version) in cell-based assay and human CD8+ T cells without impacting PD1/PDL1 blockade.Proteolytic cleavage of MDNA113 releases anti-PD1-IL-2SK and fully restores its capacity to activate IL-2R signaling.Mice treated with MDNA113 showed reduced peripheral lymphocyte expansion compared to anti-PD1-IL-2SK due to masking by the IL-13 Superkine.MDNA113 showed greater tolerability than anti-PD1-IL-2SK following repeat dose administration in mice.MDNA113, but not a non-cleavable version, demonstrated similar efficacy as anti-PD1-IL-2SK in MC38 colon tumor model despite these tumors lacking IL-13Rα2 expression.Efficacy of MDNA113 is substantially enhanced when tested in mice harboring MC38 tumors that have been engineered to overexpress IL-13Rα2, resulting in complete tumor regression in most animals.Variants of MDNA113 have also been designed with tunable masking of the IL-2 Superkine underscoring the versatility of the platform. Copies of the two presentations are available on the “Scientific Presentations” page of Medicenna’s website. About MDNA209 The Company’s MDNA209 platform consists of IL-2 muteins with targeted mutations enabling high-affinity IL-2 receptor antagonism. MDNA209 blocks the formation of the IL-2Rβγc complex, preventing downstream signaling and blocking effector T-cell functions. MDNA209 outcompetes IL-2 for IL-2Rβ and impedes γc engagement, blocking downstream signaling and restraining reactive effector immune cells, thereby offering therapeutic potential for treating inflammatory and autoimmune diseases. About MDNA113 MDNA113 is a novel, first-in-class tumor-targeted and tumor-activated bi-functional anti-PD1-IL2 Superkine with exceptionally high affinity for IL-13Rα2 without binding to the functional IL-13R⍺1. IL-13Rα2 is overexpressed in a wide range of solid tumors, including cold tumors with minimal to no expression in normal tissues. IL-13Rα2 expressing tumors also have abundant matrix metalloprotease in the tumor microenvironment that may efficiently activate MDNA113. IL-13Rα2 expression is associated with poor clinical outcome in multiple tumor types including prostate cancer, pancreatic cancer, ovarian cancer, liver cancer, breast cancer and brain cancer, with an annual world-wide incidence of over 2 million. About Medicenna Therapeutics Medicenna is a clinical-stage immunotherapy company focused on developing novel, highly selective versions of IL-2, IL-4 and IL-13 Superkines and first-in-class Empowered Superkines. Medicenna’s long-acting IL-2 Superkine, MDNA11, is a next-generation IL-2 with superior affinity toward CD122 (IL-2 receptor beta) and no CD25 (IL-2 receptor alpha) binding, thereby preferentially stimulating cancer-killing effector T cells and NK cells. Medicenna’s IL-4 Empowered Superkine, bizaxofusp (formerly MDNA55), has been studied in 5 clinical trials enrolling over 130 patients, including a Phase 2b trial for recurrent GBM, the most common and uniformly fatal form of brain cancer. Bizaxofusp has obtained FastTrack and Orphan Drug status from the FDA and FDA/EMA, respectively. Medicenna’s early-stage high-affinity IL-2β biased IL-2/IL-15 Super-antagonists, from its MDNA209 platform, are being evaluated as potential therapies for autoimmune and graft-versus host diseases. Medicenna’s early-stage BiSKITs™ (Bifunctional SuperKine ImmunoTherapies) and the T-MASK™ (Targeted Metalloprotease Activated SuperKine) programs are designed to enhance the ability of Superkines to treat immunologically “cold” tumors. For more information, please visit www.medicenna.com, and follow us on Twitter and LinkedIn. Forward-Looking Statements This news release contains forward-looking statements within the meaning of applicable securities laws. Forward-looking statements include, but are not limited to, express or implied statements regarding the future operations of the Company, estimates, plans, strategic ambitions, partnership activities and opportunities, objectives, expectations, opinions, forecasts, projections, guidance, outlook or other statements that are not historical facts, such as statements on the therapeutic potential and safety profile of MDNA209 and MDNA113. Drug development and commercialization involve a high degree of risk, and only a small number of research and development programs result in commercialization of a product. Results in early-stage pre-clinical or clinical studies may not be indicative of full results or results from later stage or larger scale clinical studies and do not ensure regulatory approval. You should not place undue reliance on these statements, or the scientific data presented. 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Investor/Media Contact: Christina CameronInvestor Relations, Medicenna Therapeutics(647) 953-0673ir@medicenna.com