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Alpine Immune Sciences Presents Clinical and Preclinical Oncology Program Updates at AACR Virtual Annual Meeting I

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NEON-1, clinical trial with ALPN-202 monotherapy, proceeds through dose escalation
New discovery efforts yield novel preclinical fusion proteins that enable tumor antigen-dependent CD28 costimulation

Alpine Immune Sciences, Inc. (NASDAQ:ALPN), a leading clinical-stage immunotherapy company focused on developing innovative treatments for cancer and autoimmune/inflammatory diseases, today announced the presentation of two posters on the company’s clinical and preclinical oncology programs at the American Association for Cancer Research (AACR) Virtual Annual Meeting I, taking place April 10-15, 2021.

CT213: NEON-1: A First-in-Human Phase I Open-Label Study of ALPN-202, a Conditional CD28 Costimulator and Dual Checkpoint Inhibitor, in Advanced Malignancies

  • Dr. Mark Voskoboynik from Nucleus Network and The Alfred Hospital in Melbourne, Australia, presented a Trials in Progress poster describing the ongoing first-in-human, phase 1 clinical trial involving monotherapy with ALPN-202, the company’s lead oncology program.

  • The trial, NEON-1, includes separate parts for dose escalation and expansion cohorts, and is enrolling patients with advanced solid tumors or lymphoma. Dose escalation continues to progress, with no dose-limiting toxicities to date.

P1740: Engineered Variant Domain Fusion Proteins Provide Checkpoint Inhibition and Tumor Antigen Dependent CD28 Costimulation Resulting in Potent Anti-Tumor Immunity

  • Alpine researchers demonstrated the use of directed evolution to engineer novel variant immunoglobulin domain (vIgD) Fc fusion proteins that enable tumor antigen-dependent CD28 costimulation.

  • The fusion proteins targeted the PD-L1 or HHLA2 tumor antigens, and demonstrated potent efficacy in antigen-positive tumor models in vitro and in vivo.

"Together, these presentations summarize the potential for an exciting, emerging CD28 costimulation portfolio," said Stanford Peng, MD, PhD, Alpine’s President and Head of Research and Development. "We look forward to the opportunity to present initial clinical data from NEON-1 at an upcoming scientific meeting and are optimistic about the potential to advance one or more of our preclinical programs toward the clinic in the near future."

Full abstracts are available on the AACR Virtual Annual Meeting website and posters for both presentations are available on the Scientific Publications page of Alpine’s website.

About Alpine’s Directed Evolution Platform

Alpine’s directed evolution platform engineers native immune proteins, primarily of the immunoglobulin or tumor necrosis factor (receptor) superfamilies, into novel functional domains: variant immunoglobulin domains (vIgDs) and/or variant TNF domains (vTDs), respectively. These domains have acquired unique functional properties designed to benefit patients with cancer or inflammatory diseases.

About ALPN-202

ALPN-202 is a first-in-class, conditional CD28 costimulator and dual checkpoint inhibitor with the potential to improve upon the efficacy of combined checkpoint inhibition while limiting significant toxicities. Preclinical studies of ALPN-202 have successfully demonstrated superior efficacy in tumor models compared to checkpoint inhibition alone. NEON-1 (NCT04186637), a Phase 1 study of ALPN-202 in patients with advanced malignancies, is currently enrolling. Alpine is also targeting the initiation of NEON-2, a Phase 1 combination study of ALPN-202 and a PD-1 inhibitor, later this year.

About Alpine Immune Sciences, Inc.

Alpine Immune Sciences, Inc. is committed to leading a new wave of immune therapeutics. With world-class research and development capabilities, a highly productive scientific platform, and a proven management team, Alpine is creating first- or best-in-class multifunctional immunotherapies via unique protein engineering technologies to improve patients’ lives. Alpine has entered into strategic collaborations with leading global biopharmaceutical companies and has a diverse pipeline of clinical and preclinical candidates in development. For more information, visit www.alpineimmunesciences.com. Follow @AlpineImmuneSci on Twitter and LinkedIn.

Forward-Looking Statements

This release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995. These forward-looking statements are not based on historical fact and include statements regarding our platform technology and potential therapies, the timing of and results from clinical trials and preclinical development activities, clinical and regulatory objectives and the timing thereof, expectations regarding the sufficiency of cash combined with the potential $75 million in pre-option exercise milestones payable under our option and license agreement with AbbVie to fund operations through 2023, the potential efficacy, safety profile, future development plans, addressable market, regulatory success, and commercial potential of our product candidates, our ability to achieve milestones in our collaboration with AbbVie, the progress and potential of our other ongoing development programs, the timing of our public presentations and potential publication of future clinical data, the efficacy of our clinical trial designs, anticipated enrollment in our clinical trials and the timing thereof, expectations regarding our ongoing collaborations, and our ability to successfully develop and achieve milestones in our development programs. Forward-looking statements generally include statements that are predictive in nature and depend upon or refer to future events or conditions and include words such as "may," "will," "should," "would," "expect," "plan," "intend," and other similar expressions, among others. These forward-looking statements are based on current assumptions that involve risks, uncertainties, and other factors that may cause actual results, events, or developments to be materially different from those expressed or implied by such forward-looking statements. These risks and uncertainties, many of which are beyond our control, include, but are not limited to: the impact of the COVID-19 pandemic on our business, research and clinical development plans and timelines and results of operations, including the impact on our clinical trial sites, collaborators, and contractors who act for or on our behalf, may be more severe and prolonged than currently anticipated; clinical trials may not demonstrate safety and efficacy of any of our product candidates; our ongoing discovery and preclinical efforts may not yield additional product candidates; our discovery-stage and preclinical programs may not advance into the clinic or result in approved products; any of our product candidates may fail in development, may not receive required regulatory approvals, or may be delayed to a point where they are not commercially viable; we may not achieve additional milestones in our proprietary or partnered programs; the impact of competition; adverse conditions in the general domestic and global economic markets; as well as the other risks identified in our filings with the Securities and Exchange Commission. These forward-looking statements speak only as of the date hereof and we undertake no obligation to update forward-looking statements, and readers are cautioned not to place undue reliance on such forward-looking statements.

"Secreted Immunomodulatory Proteins," "SIP," "Transmembrane Immunomodulatory Protein," "TIP," "Variant Ig Domain," "vIgD," and the Alpine logo are registered trademarks or trademarks of Alpine Immune Sciences, Inc. in various jurisdictions.

View source version on businesswire.com: https://www.businesswire.com/news/home/20210412005271/en/

Contacts

Alex Sharif
Director, Investor Relations and Corporate Development
Alpine Immune Sciences, Inc.
206-788-4545
ir@alpineimmunesciences.com

Laurence Watts
Managing Director
Gilmartin Group, LLC.
619-916-7620
laurence@gilmartinir.com