ALX Oncology to Present Updated Data from Phase 2 ASPEN-06 Trial, Highlighting CD47 Expression as a Predictive Biomarker in HER2+ Gastric Cancer, at 40th Society for Immunotherapy of Cancer (SITC) Annual Meeting

Company will share data demonstrating CD47 overexpression as key predictive biomarker for response with the Company’s lead candidate, evorpacept, in HER2+ gastric cancer

SOUTH SAN FRANCISCO, Calif., Oct. 03, 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 updated data from its Phase 2 ASPEN-06 (NCT05002127) trial will be presented during a poster session at the Society for Immunotherapy of Cancer (SITC) 40th Annual Meeting taking place November 5–9, 2025, in National Harbor, Maryland. The Phase 2 trial evaluated evorpacept, the Company’s lead therapeutic candidate, in combination with HERCEPTIN^® (trastuzumab), CYRAMZA^® (ramucirumab) and paclitaxel, for patients with previously treated HER2-positive advanced gastric cancer (GC) and gastroesophageal junction (GEJ) cancer.

Details for the poster presentation at SITC 2025 are as follows:
Title: CD47 expression as a predictive biomarker for evorpacept in HER2-positive gastric/gastroesophageal cancer from the Phase 2 randomized ASPEN-06 trial
First Author: Zev A. Wainberg, M.D., Professor of Medicine and Co-Director of GI Oncology Program, University of California, Los Angeles
Abstract: 496
Date and Time: Saturday, November 8, 2025, 10:00 a.m. – 6:35 p.m. ET
Location: Poster Hall (Exhibit Halls AB)

About ASPEN-06

ASPEN-06 is a randomized Phase 2 (open-label)/3 (blinded), international, multi-center study, evaluating evorpacept in combination with HERCEPTIN^® (trastuzumab), CYRAMZA^® (ramucirumab) and paclitaxel, for patients with metastatic second- or third-line HER2 overexpressing gastric/GEJ adenocarcinoma that has progressed on or after prior HER2-directed therapy and fluoropyrimidine- or platinum-containing chemotherapy and are suitable for chemotherapy. One hundred twenty-seven adult patients were enrolled in the Phase 2 portion of the study.

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 entered the clinic in a Phase 1 trial in August 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 objectives 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 Healthcare Communications
audrafriis@sambrown.com
(917) 519-9577

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