Sugemalimab

Phase Ib trial to evaluate CS5001 in combination with R-CHOP as a first-line treatment for diffuse large B-cell lymphoma (DLBCL), aiming to reshape the standard-of-care landscape. CS5001 is also being investigated globally in a multi-center Phase Ib clinical trial for multiple solid tumor types. SUZHOU, China, March 5, 2025 /PRNewswire/ -- CStone Pharmaceuticals ("CStone", HKEX: 2616), a biopharmaceutical company dedicated to developing innovative cancer therapies, today announced the submission of a Phase Ib clinical trial application in Australia for CS5001, its ROR1-targeting antibody-drug conjugate (ADC), in combination with first-line standard-of-care (SoC) for DLBCL. CS5001 is also being evaluated as both a monotherapy and in combination with a PD-L1 inhibitor for advanced solid tumors in an ongoing global multi-center clinical trial. Building on promising data from CS5001 monotherapy in later-line aggressive and indolent lymphomas, this Phase Ib trial aims to expand the therapeutic potential of CS5001 across all DLBCL stages and solid tumors. The study will explore: CS5001 + R-CHOP: First-line treatment for DLBCL patients who have not received prior systemic therapy. CS5001 + SoC: For patients with relapsed or refractory DLBCL. CS5001 Monotherapy: Targeting ROR1-expressing solid tumors. CS5001 + Sugemalimab: Combination therapy for advanced solid tumors. Dr. Jason Yang, CEO, President of R&D, and Executive Director at CStone, stated: "We are thrilled to reach another key clinical milestone for CS5001. The existing data underscore its broad potential in both lymphomas and solid tumors. Notably, a ROR1 ADC combined with R-CHP has demonstrated an impressive complete response (CR) rate in a Phase II trial for first-line DLBCL. As we advance from late-line monotherapy to frontline combination therapy, we are optimistic that CS5001 will provide significant clinical benefits to DLBCL patients and establish itself as a first-line treatment option. Meanwhile, we continue to explore CS5001's potential in solid tumors and eagerly anticipate further positive outcomes." The global multi-center Phase Ib trial for CS5001 is actively enrolling patients across the United States, Australia, and China. Recruitment is ongoing for monotherapy cohorts targeting aggressive and indolent advanced lymphomas, which could potentially expand into a Phase II single-arm registrational study. Additional cohorts, including the first-line DLBCL combination therapy and solid tumor monotherapy and combination therapy arms, will be initiated soon. About CS5001 (ROR1 ADC) CS5001 is a clinical-stage antibody-drug conjugate ("ADC") targeting ROR1 (receptor tyrosine kinase-like orphan receptor 1). CS5001 has been uniquely designed with proprietary tumor-cleavable linker and pyrrolobenzodiazepine ("PBD") prodrug. Only after reaching the tumor, the linker and prodrug are cleaved to release the PBD toxin, resulting in lethal DNA cross-links in cancer cells. The use of the linker plus PBD prodrug effectively helps address the toxicity associated with traditional PBD payloads, leading to a better safety profile. CS5001 has demonstrated complete tumor suppression in several preclinical cancer models and demonstrated favorable serum half-life and pharmacokinetic characteristics. CS5001 is a promising candidate drug with precision treatment potential in both hematologic tumors and malignant solid tumors. Additionally, CS5001 utilizes site-specific conjugation for a precise drug antibody ratio of which enables homogeneous production and large-scale manufacturing. In October 2020, CStone signed a licensing agreement with LigaChem Biosciences, Inc. (LCB) for the development and commercialization of CS5001 which was originally generated by collaboration of LCB and ABL Bio, both South Korea-based leading biotech companies. Under the agreement, CStone obtains the exclusive global right to develop and commercialize CS5001 outside the Republic of Korea. The first-in-human data for CS5001 in patients with advanced solid tumors and lymphomas was presented at the 2024 American Society of Clinical Oncology (ASCO) Annual Meeting. Additionally, the latest clinical data on CS5001 as a monotherapy in patients with advanced lymphomas has recently been presented at the 66th American Society of Hematology (ASH) Annual Meeting. CS5001 has demonstrated encouraging safety and robust anti-tumor activity in the Phase 1a dose escalation trials across 10 dose levels. At the tentative recommended Phase 2 dose (RP2D) of DL8 (125 μg/kg), CS5001 achieved objective response rates (ORRs) of 70% in advanced B-cell lymphoma and 100% in Hodgkin lymphoma. Encouraging efficacy signals were also observed in advanced solid tumors, including non-small cell lung cancer and pancreatic cancer. CS5001 was well tolerated in heavily pre-treated patients with advanced B-cell lymphomas and solid tumors. 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 . 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 WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED

Sugemalimab is the world's first anti-PD-L1 monoclonal antibody approved for the treatment of gastric or gastroesophageal junction (G/GEJ) adenocarcinoma. The GEMSTONE-303 study results support sugemalimab in combination with chemotherapy as a new standard first-line treatment for patients with PD-L1 combined positive score (CPS) ≥5. Sugemalimab is the first anti-PD-L1 monoclonal antibody demonstrating superior overall survival (OS) and progression free survival (PFS) with a manageable safety profile in combination with chemotherapy compared to placebo plus chemotherapy in patients with locally advanced or metastatic G/GEJ adenocarcinoma who have not received prior systemic treatment for advanced disease and have PD-L1 CPS ≥5. Sugemalimab has received approvals for five indications in China, and for first-line treatment of Stage IV non-small cell lung cancer (NSCLC) in China, Europe and the UK. CStone will continue to engage with health authorities in Europe and other regions for regulatory expansion. 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: In patients with PD-L1 CPS ≥5, the sugemalimab group showed statistically significant and clinically meaningful improvements in both OS and PFS compared with the control group. Median OS was 15.6 months in the sugemalimab group compared with 12.6 months in the control group, with a hazard ratio (HR) of 0.75 (95% CI, 0.61-0.92), P=0.006, indicating that sugemalimab plus CAPOX could reduce the risk of death by 25%. Median PFS was 7.6 months in the sugemalimab group versus 6.1 months in the control group, with a HR of 0.66 (95% CI, 0.54-0.81), P<0.001. Grade ≥3 treatment-related adverse events (TRAE) occurred in 53.9% of patients in the sugemalimab group and 50.6% in the control group, indicating that the safety of this combination regimen was manageable. Subgroup analyses demonstrated consistent clinical benefits across all pre-defined subgroups, including patients with varying PD-L1 expression levels: Sugemalimab plus CAPOX significantly prolonged OS in patients with PD-L1 CPS ≥10; median OS was 17.8 months in the sugemalimab group compared with 12.5 months in the control group, with a HR of 0.64 (95% CI, 0.48-0.85), P=0.002. In patients with PD-L1 CPS ≥10, median PFS was 7.8 months in the sugemalimab group compared with 5.5 months in the control group, with a HR of 0.58 (95% CI, 0.43-0.77), P<0.001. In patients with PD-L1 CPS ≥10, ORR was 71.4% in the sugemalimab group compared with 48.6% in the control group. 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: 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: In combination with chemotherapy as first-line treatment of patients with metastatic squamous and non-squamous NSCLC; For the treatment of patients with unresectable Stage III NSCLC whose disease has not progressed following concurrent or sequential platinum-based chemoradiotherapy; For the treatment of patients with relapsed or refractory extranodal NK/T-cell lymphoma; In combination with fluorouracil and platinum-based chemotherapy as first-line treatment of patients with unresectable locally advanced, recurrent or metastatic ESCC; and In combination with fluoropyrimidine- and platinum-containing chemotherapy as first-line treatment for unresectable locally advanced or metastatic gastric or gastroesophageal junction (G/GEJ) adenocarcinoma with a PD-L1 expression CPS ≥5. 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 . 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 WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED