H. Lee Moffitt Cancer Center & Research Institute, Inc.

In ASPEN-03 and ASPEN-04 trials, efficacy data do not support advancing evorpacept in combination with Merck’s anti-PD-1 therapy, KEYTRUDA® (pembrolizumab), into a registrational study Company remains confident in continuing to pursue evorpacept in multiple clinical trials, based on the different mechanism of evorpacept in combination with anti-cancer antibodies, as evidenced by durable clinical response and consistent safety data in prior clinical trials SOUTH SAN FRANCISCO, April 25, 2025 (GLOBE NEWSWIRE) -- ALX Oncology Holdings Inc., (“ALX Oncology” or the “Company”) (Nasdaq: ALXO), a clinical-stage biotechnology company advancing a pipeline of novel therapies designed to treat cancer and extend patients’ lives, today announced topline data from its Phase 2 ASPEN-03 and ASPEN-04 clinical trials. The company’s investigational CD47-blocker evorpacept, when added to Merck’s (known as MSD outside of the US and Canada) anti-PD-1 therapy, KEYTRUDA® (pembrolizumab) with or without chemotherapy, did not meet the primary endpoints in the ASPEN-03 and ASPEN-04 trials of improved objective response rates (ORR) as compared to historical controls of pembrolizumab alone and pembrolizumab with chemotherapy, respectively, as a first-line treatment in patients with advanced head and neck squamous cell carcinoma (HNSCC). The combination of evorpacept and pembrolizumab with or without chemotherapy in ASPEN-03 and ASPEN-04 demonstrated a manageable safety profile and was consistent with what has been previously reported for pembrolizumab and chemotherapy in this setting. Although the company will no longer pursue evorpacept in combination with pembrolizumab in HNSCC, multiple clinical trials of evorpacept in combination with anti-cancer antibodies will continue based on established proof-of-concept. Evorpacept blocks the ‘don’t eat me’ signal transmitted by CD47 on the surface of cancer cells that these cells use to evade detection by the immune system. As its primary mechanism of action, evorpacept is uniquely designed to stimulate macrophages to selectively attack cancer cells and not healthy cells, when combined with active anti-cancer antibodies. This mechanism has translated into durable clinical responses and a well-tolerated safety profile in HER2-positive gastric and HER2-positive breast cancer clinical trials. To further explore the benefit in this setting, evorpacept is currently being evaluated in combination with various anti-cancer antibodies in colorectal cancer, breast cancer, non-Hodgkin lymphoma and multiple myeloma. In the ASPEN-03 and ASPEN-04 clinical trials, evorpacept was combined with pembrolizumab with or without chemotherapy to investigate a second and distinct mechanism of action. This discrete approach explored the concept that evorpacept may enhance T-cell priming by activating dendritic cells and stimulating the adaptive immune system. The trial outcomes were not sufficiently supportive of advancing evorpacept in combination with pembrolizumab in HNSCC into a registrational trial. “While there were encouraging trends in ASPEN-03 in ORR versus the historical and internal control, we've decided not to pursue evorpacept and pembrolizumab in head and neck cancer in light of our prioritization of the more established anti-cancer antibody combination program based on multiple positive studies,” said Alan Sandler, M.D., Chief Medical Officer at ALX Oncology. “We are disappointed that these studies did not meet their primary endpoints, most importantly for the patients for whom current standard-of-care treatment approaches fall short, and we thank all who participated in the trials.” “Moving forward, we are continuing to rapidly advance our clinical program combining evorpacept with anti-cancer antibodies supported by robust clinical data across trials in multiple tumor types. Evorpacept has demonstrated response rates and durability beyond what is expected from standard of care across several studies when combined with HERCEPTIN®, zanidatamab and RITUXAN®,” said Jason Lettmann, Chief Executive Officer at ALX Oncology. “Based on the positive data and strong mechanistic rationale, we maintain our confidence in the evorpacept clinical development program and intend to deliver on that promise with additional clinical data in breast cancer and colorectal cancer in the near-term. With evorpacept and ALX2004, our novel EGFR-targeted antibody-drug conjugate, we continue our commitment to bringing forth meaningful therapies for patients living with cancer.” Detailed findings from the ASPEN-03 and ASPEN-04 trials will be submitted to a future medical meeting. KEYTRUDA® is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA. About ASPEN-03 and ASPEN-04 Clinical Trials ASPEN-03 and ASPEN-04 are randomized, multi-center, international Phase 2 trials evaluating evorpacept, ALX Oncology’s investigational CD47-blocking therapeutic that uniquely combines a high-affinity CD47-binding domain with an inactivated proprietary Fc domain, in patients with metastatic or unresectable, recurrent HNSCC who have not yet been treated for their advanced disease. The ASPEN-03 trial (NCT04675294) is evaluating evorpacept in combination with Merck’s anti-PD-1 therapy, KEYTRUDA® (pembrolizumab) against pembrolizumab alone for the treatment of patients whose HNSCC is PD-L1 positive. The ASPEN-04 trial (NCT04675333) is evaluating evorpacept in combination with pembrolizumab and chemotherapy against pembrolizumab and chemotherapy alone in patients with HNSCC, regardless of PD-L1 status. Patient characteristics in the trials (N=346) were generally well-balanced across arms. The primary endpoints for the ASPEN-03 and ASPEN-04 trials is ORR compared to historical control. Key secondary endpoints for both trials are safety, duration of response (DOR), progression-free survival (PFS) and overall survival (OS). About Head and Neck Squamous Cell Carcinoma (HNSCC) HNSCC is a serious and life-threatening disease that originates in the squamous cells lining the mucosal surfaces of the head and neck, including the mouth, throat, voice box, sinuses and nasal cavity. HNSCC is the seventh most common cancer worldwide and the incidence of HNSCC is expected to increase 30% by 2030. Despite current standard-of-care therapies and recent advancements in diagnosis and treatment, people with HNSCC face a poor prognosis, particularly when diagnosed at advanced stages. Further, the survival rate for HNSCC has only modestly improved in recent years, even with the availability of new treatment modalities, underscoring a need for improved therapeutics. About Evorpacept ALX Oncology's lead therapeutic candidate, evorpacept, is a highly differentiated potential best- and first-in-class CD47 checkpoint inhibitor and one of the most advanced checkpoint inhibitors to target and activate the innate immune system. Evorpacept was intentionally designed to maximize the clinical potential of blocking CD47, while reducing the toxicities associated with previous approaches to CD47 blockade. In clinical studies across a wide spectrum of tumor types in more than 700 patients to date, evorpacept has demonstrated potential to enhance the therapeutic activity of many of the most important cancer therapies available today, contributing an additional, differentiated immuno-oncology mechanism. Based on this potential, ALX Oncology is advancing a robust clinical program evaluating evorpacept in a wide range of cancer indications, prioritizing its combination with anti-cancer antibodies in breast, gastric and colon cancers. The U.S. Food and Drug Administration (FDA) has granted Fast Track designation to evorpacept for the second-line treatment of patients with HER2-positive gastric or GEJ carcinoma. Additionally, both the FDA and European Commission have granted Orphan Drug Designation for this indication. About ALX Oncology ALX Oncology (Nasdaq: ALXO) is a clinical-stage biotechnology company advancing a pipeline of novel therapies designed to treat cancer and extend patients’ lives. ALX Oncology’s lead therapeutic candidate, evorpacept, has demonstrated potential to serve as a cornerstone therapy upon which the future of immuno-oncology can be built. Evorpacept is currently being evaluated across multiple ongoing clinical trials in a wide range of cancer indications. ALX Oncology’s second pipeline candidate, ALX2004, is a novel EGFR-targeted antibody-drug conjugate with a differentiated mechanism of action and is anticipated to enter Phase 1 trials mid-2025. More information is available at www.alxoncology.com and on LinkedIn @ALX Oncology. Cautionary note regarding forward-looking statements This press release contains forward-looking statements that involve substantial risks and uncertainties. Forward-looking statements include statements regarding future results of operations and financial position, business strategy, product candidates, planned preclinical studies and clinical trials, results of clinical trials, research and development costs, regulatory approvals, timing and likelihood of success, plans and objects of management for future operations, as well as statements regarding industry trends. Such forward-looking statements are based on ALX Oncology’s beliefs and assumptions and on information currently available to it on the date of this press release. Forward-looking statements may involve known and unknown risks, uncertainties and other factors that may cause ALX Oncology’s actual results, performance or achievements to be materially different from those expressed or implied by the forward-looking statements. These and other risks are described more fully in ALX Oncology’s filings with the Securities and Exchange Commission (SEC), including ALX Oncology’s Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and other documents ALX Oncology files with the SEC from time to time. Except to the extent required by law, ALX Oncology undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made. Investor Relations Contact: Elhan Webb, CFA, IR Consultant ewebb@alxoncology.com Media Contact: Audra Friis, Sam Brown, Inc. audrafriis@sambrown.com (917) 519-9577

MILWAUKEE, April 24, 2025 /PRNewswire/ -- Hammes, a national real estate consulting, development, investment and management firm, was proud to join Moffitt Cancer Center on April 22 to mark two celebratory milestones at SPEROS FL in Pasco County, Florida: the topping out of the Moffitt Discovery and Innovation Center and the installation of the cyclotron for the region's first proton therapy system at the Richard M. Schulze Family Foundation Proton Center. Continue Reading Image from the Moffitt Cancer Center SPEROS FL Milestone Celebration The cyclotron installation was the highlight of the event after its 4,600-mile journey from Belgium. The ProteusONE proton therapy system will offer unmatched precision in cancer treatment, reducing side effects and improving outcomes by targeting tumors with millimeter accuracy. Once installed, it will be the first proton therapy system and the most advanced in the Tampa Bay region. On schedule to open in January 2026, Moffitt's new Speros campus is a global innovation hub targeting cancer care, research and biotechnology. Hammes is serving as program manager for the campus' new 120,000-square-foot outpatient and proton facility, as well as the new 240,000-square-foot research center, which is dedicated to research in drug development, bioengineering, metabolism, and cancer biology. Earlier this year, Hammes celebrated the completion of Moffitt Cancer Center at SouthShore, a 75,000-square-foot ambulatory center, located south of Tampa in Ruskin, Florida. View the Moffitt Cancer Center media kit, including B-roll and renderings, here. About Hammes Founded in 1991, Hammes is a vertically integrated real estate solutions platform specializing in healthcare real estate strategy and planning, project management, development, investment, and property management. As a testament to our deep healthcare industry experience, Hammes has been recognized as one of the nation's leading healthcare developers by Modern Healthcare's Construction & Design Survey for 26 consecutive years—including 21 years as No. 1— and by Revista's Outpatient Healthcare Real Estate Development Report. Headquartered in Milwaukee, Wisconsin, Hammes provides services through a network of regional offices strategically located across the United States. SOURCE Hammes WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED

TAMPA, Fla., April 8, 2025 — TuHURA Biosciences, Inc. (NASDAQ:HURA) (“TuHURA”), a Phase 3 immune-oncology company developing novel technologies to overcome resistance to cancer immunotherapy, today announced that an abstract highlighting Kineta Inc.’s novel KVA12123 antibody and an abstract from Moffitt Cancer Center scientists examining the mechanisms of Company’s IFx-Hu2.0 therapy in advanced melanoma have been selected for poster presentation at the American Association for Cancer Research (AACR) Annual Meeting 2025, taking place April 25-30, 2025, at the McCormick Place Convention Center in Chicago, IL. Details of the accepted abstracts are as follows: Title: Initial results from a first in human phase 1 study of KVA12123, an anti-VISTA antibody, alone and in combination with pembrolizumab in patients with advanced solid tumorsTrack: Experimental and Molecular TherapeuticsSession: PO.CT01.03 – Phase 0 and Phase I Clinical TrialsAbstract Number: CT041/ 20Presenter: Thierry Guillaudeux, Ph.D., Chief Scientific Officer of KinetaDate and Time: April 28, 2025, 9:00 AM – 12:00 PM ETLocation: Section 29 Title: Mechanistic insights into IFx-Hu2.0 responses in the first human trial after prior anti-PD-1 therapy failureTrack: ImmunologySession: PO.IM01.07 – Enhanced Antibodies, TCR Constructs, Cytokines and Chimeric ProteinsAbstract Number: 3428 / 23Presenter: Joseph Markowitz, M.D., Ph.D.Date and Time: April 28, 2025, 2:00 PM – 5:00 PM ETLocation: Section 35 For more and to view the abstract, visit the AACR Annual Meeting website. As previously announced, on December 11, 2024, TuHURA entered into a definitive agreement with Kineta, Inc. (OTC Pink: KANT) (“Kineta”), in which TuHURA would acquire Kineta, including the rights to Kineta’s novel KVA12123 antibody, for a combination of cash and shares of TuHURA common stock via a merger transaction. The merger is currently targeted to close in Q2 2025 pending the satisfaction of funding conditions and other closing conditions. About TuHURA Biosciences, Inc. TuHURA Biosciences, Inc. (Nasdaq: HURA) is a Phase 3 immuno-oncology company developing novel technologies to overcome primary and acquired resistance to cancer immunotherapy, two of the most common reasons cancer immunotherapies fail to work or stop working in the majority of patients with cancer. TuHURA’s lead innate immune agonist, IFx-2.0, is designed to overcome primary resistance to checkpoint inhibitors. TuHURA is preparing to initiate a single randomized placebo-controlled Phase 3 registration trial of IFx-2.0 administered as an adjunctive therapy to Keytruda® (pembrolizumab) compared to Keytruda® plus placebo in first line treatment for advanced or metastatic Merkel Cell Carcinoma. In addition to its innate immune agonist product candidates, TuHURA is leveraging its Delta Opioid Receptor technology to develop first-in-class, bi-specific antibody drug conjugates and antibody peptide conjugates targeting Myeloid Derived Suppressor Cells to inhibit their immune-suppressing effects on the tumor microenvironment to prevent T cell exhaustion and acquired resistance to checkpoint inhibitors and cellular therapies. For more information, please visit tuhurabio.com and connect with TuHURA on Facebook, X, and LinkedIn. IMPORTANT ADDITIONAL INFORMATION In connection with the proposed acquisition by merger of Kineta, Inc. (“Kineta”) by TuHURA (the “Merger”), TuHURA filed with the U.S. Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4, dated February 7, 2025 (the “Registration Statement”), which contains a preliminary joint proxy statement of Kineta and TuHURA and a preliminary prospectus of TuHURA (the “Joint Proxy Statement/Prospectus”), and TuHURA and Kineta may file with the SEC other relevant documents regarding the Merger. Investors and securityholders of TuHURA and Kineta are urged to read the Joint Proxy Statement/Prospectus and such other materials carefully when they become available because they will contain important information about TuHURA, Kineta, and the proposed Merger. This press release is not a substitute for the definitive Joint Proxy Statement/Prospectus, when it becomes available, or any other documents that TuHURA may file with the SEC or send to securityholders in connection with the proposed Merger. A definitive copy of the Joint Proxy Statement/Prospectus will be mailed to Kineta and TuHURA stockholders when that document is final. Investors and stockholders will be able to obtain free copies of the documents filed or that will be filed with the SEC by TuHURA, when they become available, through the website maintained by the SEC at www.sec.gov. The documents filed by TuHURA with the SEC may also be obtained free of charge at TuHURA’s website at www.tuhurabio.com or upon written request to: TuHURA, 10500 University Drive, Suite 110, Tampa, Florida 33612. NO OFFER OR SOLICITATION This press release is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the Merger and is not intended to and does not constitute an offer to sell or the solicitation of an offer to buy the securities of TuHURA or Kineta, nor shall there be any sale of any such securities in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act. PARTICIPANTS IN THE SOLICITATION TuHURA and Kineta and their respective directors and officers and other members of management may, under SEC rules, be deemed to be participants in the solicitation of proxies from stockholders in connection with the Merger and other matters that may be set forth in the Joint Proxy Statement/Prospectus. Information about TuHURA’s directors and executive officers is set forth in TuHURA’s filings with the SEC, including TuHURA’s Form 10-K filed on March 31, 2025. Additional information regarding the direct and indirect interests, by security holdings or otherwise, of those persons and other persons who may be deemed participants in the solicitation of proxies in the Merger may be obtained by reading the Joint Proxy Statement/Prospectus when it becomes available. You may obtain free copies of these documents as described above under “IMPORTANT ADDITIONAL INFORMATION”. CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS This press release contains certain “forward-looking statements” within the meaning of, and subject to the safe harbor created by, Section 27A of the Securities Act, Section 21E of the Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995. These Forward-looking statements are based only on our current beliefs, expectations and assumptions regarding the future of our business, future plans and strategies, projections, anticipated events and other future conditions. In some cases you can identify these statements by forward-looking words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “could,” “should,” “would,” “project,” “plan,” “expect,” “goal,” “seek,” “future,” “likely” or the negative or plural of these words or similar expressions. Examples of such forward-looking statements include but are not limited to express or implied statements regarding TuHURA’s expectations, hopes, beliefs, intentions or strategies regarding the future and include, without limitation, statements regarding TuHURA’s IFx-Hu2.0 product candidate and anticipated Phase 3 trial, its tumor microenvironment modulators development program, its potential acquisition by merger of Kineta Inc. and the statements about Kineta’s VISTA-101 development program and statements regarding the closing conditions for the transaction, TuHURA’s needs and expectations regarding its existing capital resources and its need for additional capital, and any developments or results in connection therewith and the anticipated regulatory pathway and timing of the foregoing development programs, studies and trials. In addition, any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. You are cautioned that such statements are not guarantees of future performance and that actual results or developments may differ materially from those set forth in these forward-looking statements. Factors that could cause actual results to differ materially from these forward-looking statements are described in detail in our registration statements, reports and other filings with the SEC, which are available on the combined company’s website, and at www.sec.gov. The forward-looking statements and other information contained in this press release are made as of the date hereof, and TuHURA does not undertake any obligation to update publicly or revise any forward-looking statements or information, whether as a result of new information, future events or otherwise, unless so required by applicable securities laws. Nothing herein shall constitute an offer to sell or the solicitation of an offer to buy any securities. Investor Contact: Dan DearbornCFO813-875-6600 View original content to download multimedia:https://www.prnewswire.com/news-releases/tuhura-biosciences-inc-announces-abstracts-accepted-for-poster-presentation-at-the-2025-aacr-annual-meeting-302422765.html SOURCE TuHURA Biosciences, Inc.