Biocytogen Subsidiary Eucure Biopharma Reports First Patient Enrolled in anti-CTLA4 Phase I Trial in China

BOSTON and BEIJING,Jan. 26,2021 --Eucure Biopharma,a subsidiary of Biocytogen,announced the first patient enrollment for a Phase I clinical trial in China to evaluate the safety,tolerability,pharmacokinetics and preliminary efficacy of its anti-CTLA4 monoclonal antibody (YH001) in patients with solid tumors.

In May 2020,Eucure Biopharmainitiated a first-in-human Phase I dose-escalation trial of YH001 in advanced solid tumors in Australia. One run-in cycle was used to explore the safety and tolerability of escalating doses of YH001 monotherapy,followed by four treatment cycles of YH001 in combination with fixed dose Toripalimab (an anti-PD-1 antibody). In the firstfour cohorts,no grade 3 or higher adverse events (AE) were observed,demonstrating a favorable safety profile.

The Phase I trial in China will assess the safety and preliminary efficacy of YH001 as a single agent in patients with advanced solid tumors. The leading principal investigator is Professor Cai-Cun Zhou,Director of the Department of Oncology at Shanghai Pulmonary Hospital. The trial will be conducted concurrently with Professor Yongsheng Wang at West China Hospital and Professor Tongtong An at Peking University Cancer Hospital.

Dr. Yuelei Shen,CEO of Biocytogen and Eucure Biopharma,said that the first patient enrolled for YH001 treatment in China "will be another important milestone for Eucure Biopharma". "Eucure Biopharma's mission is to bring the latest global therapeutic concepts and new drugs to Chinese patients,with scientific innovation and patient welfare as our top priority. We hope to take this opportunity to strengthen our cooperation with domestic experts to smoothly advance the business of Biocytogen/Eucure Biopharma in China."

About YH001

YH001 is an anti-cytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) humanized monoclonal antibody that relieves CTLA-4-mediated immunosuppression and enhances the T-cell-mediated antitumor immune response. YH001 can triggerantibody-dependent cell-mediated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) to remove CTLA-4 expressing cells,especially regulatory T cells,to treatvarious tumors. YH001 has demonstrated excellent affinity,safety,and in vivo efficacy in Biocytogen's humanized mouse models.

About Eucure Biopharma

Eucure Biopharma is a biotechnology company with rich experience in new drug discovery and clinical development. Eucure focuses on the development of innovative antibody drugs with independent intellectual property rights. Leveraging cooperative development and strong clinical assets,Eucure Biopharma has built a strong preclinical and clinical pipeline for over ten targets. Currently,two products have received clinical trial approvals in the US and China. In Australia,three products have entered Phase I clinical stages. For more information,please visit http://www.eucure.com/en/.

About Biocytogen

Biocytogen is a biotechnology company that offers a comprehensive portfolio of products and preclinical services,including in vivo/in vitro pharmacology,animal model generation,and therapeutic antibody discovery using its flagship RenMab™ model. Biocytogen collaborates with global partners to accelerate drug discovery and development. For more information,please visit www.biocytogen.com.

Media Contact:

Eucure Biopharma

Yuanyuan Li

yuanyuan.li@bbctg.com.cn

Biocytogen

Jenna Frame

frame@biocytogen.com