Antennova Presents Latest Phase I/II Data on ATN-022 in Advanced/Metastatic Gastric Cancer, Including an ORR of 42.9%, at ASCO GI 2025

BOSTON, Jan. 21, 2025 /PRNewswire/ -- Antennova, a clinical-stage biotech company focused on oncology today announced the presentation of latest data from its Phase I/II CLINCH study ongoing in China and Australia evaluating ATN-022 (CLDN18.2 antibody-drug conjugate [ADC]) in patients with advanced or metastatic gastric cancer at the American Society of Clinical Oncology Gastrointestinal Cancers Symposium 2025 (ASCO GI 2025).

• The CLINCH study is a Phase I/II study ongoing in China and Australia with a dose escalation phase followed by a dose expansion phase. As of November 22, 2024, among 21 gastric cancer patients in dose expansion phase with CLDN 18.2 expression of IHC 2+ ≥ 20% who had at least 1 tumor evaluation, the overall response rate (ORR) was 42.9%, and the disease control rate (DCR) was 95.2% (9 partial responses [PRs] including 8 confirmed PRs; and 11 stable diseases [SDs]). 
• Among 10 gastric cancer patients with CLDN 18.2 expression of IHC 2+ < 20% treated at efficacious doses of 1.8 – 2.4 mg/kg, the ORR was 30.0% (1 complete response [CR] and 2 PRs, all PR/CR were confirmed with CLDN 18.2 expression of IHC 2+ < 5%), and the DCR was 50.0%. The patient with CR has demonstrated durable response and has been on the study for over 14 months as of the cut-off date.
• ATN-022 demonstrated a manageable safety profile and promising preliminary antitumor activity in late stage gastric cancer patients across various levels of CLDN18.2 expression, supporting further clinical investigations of ATN-022 in gastric cancer patients. The enrollment of gastric cancer patients for dose optimization and patients with other solid tumors is ongoing in China and Australia.

Details of the Poster Presentation:

ATN-022 (also known as ATG-022, CLDN18.2 antibody-drug conjugate)

Title: Safety and Preliminary Efficacy of ATG-022 in Patients with Advanced/Metastatic Gastric Cancer (CLINCH)

Abstract Number: 456 

Session: Poster Session A: Cancers of Esophagus and Stomach and Other Gastrointestinal Cancers

Presenter: Jinfeng Ma  Shanxi Cancer Hospital

Date: Thursday, January 23, 2025

Time: 11:30 AM - 1:00 PM (Pacific time)

           3:30 AM - 5:00 AM, January 24, 2025 (Beijing time)

About ATN-022

ATN-022 is an antibody-drug conjugate (ADC) designed to target CLDN18.2, a member of the Claudin family of cell adhesion molecules. Under normal conditions, Claudins are located within tight junctions between cells, forming a barrier to regulate cell permeability. However, in cancer, Claudins are aberrantly expressed on the cell surface due to changes in cell polarity. CLDN18.2 is frequently overexpressed in a range of primary malignant tumors, including gastric, esophageal, cholangiocarcinoma, pancreatic and other cancers. The U.S. Food and Drug Administration (FDA) has awarded Orphan Drug Designations to ATN-022, for gastric and pancreatic cancers.

Data from the ongoing CLINCH study of ATN-022 has shown promising clinical efficacy in gastric cancer patients with various levels of CLDN18.2 expression. The efficacy already observed across all levels of CLDN18.2 expression in patients with gastric cancer suggests that ATN-022 holds the promise as a competitive treatment option.

About Antennova

Antennova, a Delaware corporation and a subsidiary of Antengene (HKEX: 6996), is a clinical-stage biotech company specialized in developing innovative therapeutics that target the critical biological mechanisms that enable cancers to evade and resist treatment by current drugs. Antennova is developing a pipeline of oncology candidates that can potentially enhance the effectiveness of standard therapies.

Forward-Looking Statements

The forward-looking statements made in this document relate only to the events or information as of the date on which the statements are made in this document. Except as required by law, we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise, after the date on which the statements are made or to reflect the occurrence of unanticipated events. You should read this document completely and with the understanding that our actual future results or performance may be materially different from what we expect. In this document, statements of, or references to, our intentions or those of any of our Directors or our Company are made as of the date of this document. Any of these intentions may alter in light of future development.

For more information, please contact:

Investor Relations
Email: [email protected]

SOURCE Antennova