Akeso Announces First Patient Dose in Global Registrational Trial of Cadonilimab (PD-1/CTLA-4) for PD-1 Treatment-Resistant Hepatocellular Carcinoma

HONG KONG, Sept. 15, 2025 /PRNewswire/ -- Akeso, Inc. (9926.HK) ("Akeso" or the "Company") announced that the first patient has been dosed in its global, multicenter, randomized Phase II registrational trial (COMPASSION-36/AK104-225). The trial will evaluate cadonilimab, Akeso's first-in-class PD-1/CTLA-4 bispecific antibody, in combination with lenvatinib versus lenvatinib alone for the treatment of advanced hepatocellular carcinoma (HCC) in patients previously treated with atezolizumab (a PD-L1 inhibitor) and bevacizumab.

COMPASSION-36 is the first global registrational Phase III trial of cadonilimab, currently ongoing in China, the U.S. and Europe. Its advancement represents a significant milestone in the global development and registration of cadonilimab, reflecting Akeso's commitment to advancing cancer immunotherapy and addressing the limited survival benefits associated with single-target therapies.

Additional global multicenter registrational/Phase III clinical trials for cadonilimab are currently being prepared. Going forward, Akeso will continue to pursue a dual strategy of in-house development and open collaboration, leveraging high-quality global resources to accelerate the internationalization of cadonilimab and offer patients worldwide improved and more accessible treatment options.

Currently, immune checkpoint inhibitor (IO) combination therapies have become the standard first-line treatment for various advanced malignancies. However, for patients worldwide whose disease progresses after IO combination therapy, there is a lack of effective second-line treatment options. The very limited second-line treatment options for advanced malignancies drive the critical need to explore new therapeutic strategies. Cadonilimab-based combination therapies have shown substantial potential in overcoming IO resistance across multiple tumor types.

Hepatocellular carcinoma (HCC) is one of the most prevalent malignancies worldwide, with approximately 865,000 new cases of liver cancer reported globally in 2022. The combination of atezolizumab and bevacizumab (A+T regimen) is the standard first-line therapy for advanced HCC, as recommended by the NCCN guidelines. However, for patients whose disease progresses after first-line A+T treatment, there is currently no FDA-approved second-line therapy available in the U.S., and also no approved treatment options from the NMPA in China. This creates a significant unmet need in the clinical management of these patients.

The potential of cadonilimab for the treatment of HCC has been validated in multiple studies. The promising data from the combination of cadonilimab and pulocimab (anti-VEGFR-2) in treating IO-resistant lung cancer was recently presented as an oral presentation at WCLC 2025, generating widespread attention within the industry. At the 2023 ESMO Asia Congress, a study was presented demonstrating that cadonilimab, combined with FOLFOX-HAIC as neoadjuvant therapy, achieved a 100% disease control rate (DCR) in patients with resectable multinodular HCC. Data presented at the 2023 ESMO Congress revealed that the combination of cadonilimab and lenvatinib as first-line treatment for advanced HCC shows superior antitumor activity.

Akeso's exploration of combination therapies with cadonilimab in the treatment of HCC offers a broad and effective approach to disease management. These combinations address both early and advanced stages of HCC and provide promising therapeutic options for a wide range of patients.

In addition to the international multicenter Phase II registrational study COMPASSION-36, patient enrollment for the Phase III clinical trial of cadonilimab as adjuvant therapy for high-risk recurrence following curative surgery for HCC has been completed. Furthermore, a Phase III registrational study of cadonilimab combined with lenvatinib and transarterial chemoembolization (TACE) for the treatment of intermediate to advanced unresectable HCC is currently ongoing.

Forward-Looking Statement of Akeso, Inc.

This announcement by Akeso, Inc. (9926.HK, "Akeso") contains "forward-looking statements". These statements reflect the current beliefs and expectations of Akeso's management and are subject to significant risks and uncertainties. These statements are not intended to form the basis of any investment decision or any decision to purchase securities of Akeso. There can be no assurance that the drug candidate(s) indicated in this announcement or Akeso's other pipeline candidates will obtain the required regulatory approvals or achieve commercial success. If underlying assumptions prove inaccurate or risks or uncertainties materialize, actual results may differ materially from those set forth in the forward-looking statements.

Risks and uncertainties include but are not limited to, general industry conditions and competition; general economic factors, including interest rate and currency exchange rate fluctuations; the impact of pharmaceutical industry regulation and health care legislation in P.R.China, the United States and internationally; global trends toward health care cost containment; technological advances, new products and patents attained by competitors; challenges inherent in new product development, including obtaining regulatory approval; Akeso's ability to accurately predict future market conditions; manufacturing difficulties or delays; financial instability of international economies and sovereign risk; dependence on the effectiveness of the Akeso's patents and other protections for innovative products; and the exposure to litigation, including patent litigation, and/or regulatory actions.

Akeso does not undertake any obligation to publicly revise these forward-looking statements to reflect events or circumstances after the date hereof, except as required by law.

About Akeso
Akeso (HKEX: 9926.HK) is a leading biopharmaceutical company committed to the research, development, manufacturing and commercialization of the world's first or best-in-class innovative biological medicines. Founded in 2012, the company has created a unique integrated R&D innovation system with the comprehensive end-to-end drug development platform (ACE Platform) and bi-specific antibody drug development technology (Tetrabody) as the core, a GMP-compliant manufacturing system and a commercialization system with an advanced operation mode, and has gradually developed into a globally competitive biopharmaceutical company focused on innovative solutions. With fully integrated multi-functional platform, Akeso is internally working on a robust pipeline of over 50 innovative assets in the fields of cancer, autoimmune disease, inflammation, metabolic disease and other major diseases. Among them, 24 candidates have entered clinical trials (including 15 bispecific/multispecific antibodies and bispecific ADCs. Additionally, 7 new drugs are commercially available. Through efficient and breakthrough R&D innovation, Akeso always integrates superior global resources, develops the first-in-class and best-in-class new drugs, provides affordable therapeutic antibodies for patients worldwide, and continuously creates more commercial and social values to become a global leading biopharmaceutical enterprise.

For more information, please visit https://www.akesobio.com/en/about-us/corporate-profile/ and follow us on Linkedin.

SOURCE Akeso, Inc.