CStone Announces Publication of GEMSTONE-303 Study Results for Sugemalimab (Cejemly®) in JAMA
CStone Announces Publication of GEMSTONE-303 Study Results for Sugemalimab (Cejemly®) in JAMA |
| [24-February-2025] |
SUZHOU, China, Feb. 24, 2025 /PRNewswire/ -- CStone Pharmaceuticals ("CStone", HKEX: 2616), an innovation-driven biopharmaceutical company focused on the research and development of anti-cancer therapies, today announced the publication of the GEMSTONE-303 study results for sugemalimab (brand name: Cejemly®) in the prestigious Journal of the American Medical Association (JAMA) . GEMSTONE-303 is a Phase 3, randomized, double-blind, placebo-controlled study designed to evaluate the efficacy of sugemalimab in combination with capecitabine and oxaliplatin (CAPOX) compared to placebo plus CAPOX as first-line treatment for patients with unresectable locally advanced or metastatic G/GEJ adenocarcinoma with PD-L1 CPS ≥5. The dual primary endpoints were OS and investigator-assessed PFS. Key secondary endpoints included PFS assessed by the Blinded Independent Central Review Committee (BICR), objective response rate (ORR), and duration of response (DoR). The GEMSTONE-303 article published in JAMA highlights the following key efficacy and safety findings:
Subgroup analyses demonstrated consistent clinical benefits across all pre-defined subgroups, including patients with varying PD-L1 expression levels:
Dr. Jason Yang, CEO, President of R&D, and Executive Director at CStone, stated: "We are honored to see the GEMSTONE-303 study results published in JAMA. This study establishes sugemalimab in combination with chemotherapy as the new standard first-line treatment for patients with PD-L1 CPS ≥5 G/GEJ adenocarcinoma. To date, sugemalimab has been approved for five indications in China. Internationally, we have expanded its regulatory pathways and forged commercialization partnerships in various global markets. The compelling clinical data from GEMSTONE-303 reinforce our confidence in advancing the global registration and commercialization of sugemalimab. We are committed to unlocking its full clinical potential and providing greater survival benefits to patients worldwide." Professor Lin Shen, Peking University Cancer Hospital, the leading principal investigator of the GEMSTONE-303 study, said: "Before the availability of PD-1 monoclonal antibodies, chemotherapy was the standard first-line treatment for unresectable, locally advanced or metastatic G/GEJ adenocarcinoma, with median OS rarely exceeding one year. The combination of anti-PD-1 antibodies and chemotherapy has significantly extended survival for these patients. The GEMSTONE-303 study builds on this progress. As the first anti-PD-L1 antibody approved for this patient population, sugemalimab specifically targeted the PD-L1-expressing population in its pivotal study, achieving significant efficacy with a manageable safety profile. The acceptance and publication of these results in JAMA affirm the innovation of GEMSTONE-303 and the valuable contributions of all researchers and participants involved." *Link to JAMA Network: https://jamanetwork.com/journals/jama/article-abstract/2830739 About Sugemalimab The anti-PD-L1 monoclonal antibody sugemalimab was developed by CStone using OmniRat® transgenic animal platform, which allows creation of fully human antibodies in one step. Sugemalimab is a fully human, full-length anti-PD-L1 immunoglobulin G4 (IgG4) monoclonal antibody, which may reduce the risk of immunogenicity and toxicity for patients, a unique advantage over similar drugs. The National Medical Products Administration (NMPA) of China has approved sugemalimab for five indications:
The European Commission (EC) has approved sugemalimab (brand name: Cejemly®) in combination with platinum-based chemotherapy for the first-line treatment of patients with metastatic NSCLC with no sensitizing EGFR mutations, or ALK, ROS1 or RET genomic tumor aberrations. The Medicines and Healthcare products Regulatory Agency (MHRA) in the United Kingdom has approved the marketing authorization application for sugemalimab in combination with platinum-based chemotherapy for first-line treatment of metastatic NSCLC with no sensitizing EGFR mutations, or ALK, ROS1 or RET genomic tumor aberrations. About CStone CStone (HKEX: 2616), established in late 2015, is an innovation-driven biopharmaceutical company focused on the research and development of anti-cancer therapies. Dedicated to addressing patients' unmet medical needs in China and globally, the Company has made significant strides since its inception. To date, the Company has successfully launched 4 innovative drugs and secured approvals for 16 new drug applications (NDAs) covering 9 indications. The company's pipeline is balanced by 16 promising candidates, featuring potentially first-in-class or best-in-class antibody-drug conjugates (ADCs), multispecific antibodies, immunotherapies and precision medicines. CStone also prides itself on a management team with comprehensive experiences and capabilities that span the entire drug development spectrum, from preclinical and translational research to clinical development, drug manufacturing, business development, and commercialization. For more information about CStone, please visit www.cstonepharma.com. Forward-looking statements The forward-looking statements made in this article only relate to events or information as of the date when the statements are made in this article. Except as required by law, we undertake no obligation to update or publicly revise 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 article completely and with the understanding that our actual future results or performance may be materially different from what we expect. All statements in this article are made on the date of publication of this article and may change due to future developments. Disclaimer: only for communication and scientific use by medical and health professionals, it is not intended for promotional purposes.
SOURCE CStone Pharmaceuticals | ||
Company Codes: HongKong:2616 |
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