近日,人福医药自主研发的FGFR2b单抗HWS116注射液I期临床试验顺利完成首例患者入组,标志着该产品正式进入患者人体试验阶段。
这项“HWS116注射液治疗晚期实体瘤的单臂、开放标签、剂量递增、剂量扩展I期临床试验”,由中山大学肿瘤防治中心徐瑞华院士牵头,旨在评估HWS116注射液单药治疗晚期实体瘤的安全性、耐受性、药代动力学和初步有效性。
关于FGFR2b单抗
成纤维细胞生长因子(FGF)及其受体(FGFR)调节广泛的生理细胞过程,人类功能性FGFR家族主要包含FGFR1、FGFR2、FGFR3、FGFR4四个核心亚型,异常的FGFR信号通路激活通过增加细胞增殖、延长生存期、血管生成来驱动癌症的进展及转移。已有多款靶向FGFR的小分子酪氨酸激酶抑制剂(TKIs)上市,但该类药物临床获益在一定程度上受限于脱靶抑制FGFR1导致的高磷血症和FGFR基因耐药突变的出现[1]。成纤维细胞生长因子受体2b(FGFR2b,也称FGFR2 IIIb),是FGFR2的同源异构体,主要在上皮细胞中表达[2]。在肿瘤发生发展过程中,FGFR2b信号通路常出现异常激活(扩增、突变、过表达等),并引起下游RAS-RAF- MAPK、PI3K-AKT等信号通路持续异常激活,进而驱动肿瘤细胞增殖、存活及血管生成[3]。FGFR2b的异常激活在胃癌、乳腺癌、胆管癌、肺癌、卵巢癌等多种恶性肿瘤中普遍存在[4]。有研究显示,约38%的胃癌患者中存在FGFR2b过表达[5]。
相比小分子药物,FGFR2b单抗具备三大优势:
精准靶向:特异性识别FGFR2b独特表位,规避脱靶毒性;
克服耐药:作用于胞外域,不受激酶域突变影响;
给药便利:半衰期长、血药浓度稳定,给药频率低;
目前全球尚无FGFR2b靶向药物获批上市。
关于HWS116注射液
HWS116是人福医药研究院自主研发的1类创新型生物制品,通过双重机制发挥抗肿瘤作用:
阻断FGFR2b信号通路抑制肿瘤生长;
Fc介导的细胞毒性作用(ADCC)和吞噬作用(ADCP)杀伤肿瘤细胞;
临床前数据显示,HWS116在多种FGFR2b高表达肿瘤模型中抑瘤效果优于同类产品,且安全性良好。
里程碑意义:
HWS116是全球第三款进入临床阶段的FGFR2b单抗。随着项目推进,有望为FGFR2b异常晚期肿瘤患者提供新的精准治疗选择,改善当前治疗手段匮乏、预后不佳的临床困境。
关于人福医药研究院
人福医药研究院是人福医药集团的中央研发机构,是集团创新发展的核心引擎,承载着集团战略转型使命,为构建全球研发体系、冲刺世界一流生命科技企业提供核心支撑。研究院聚焦创新药研发,以满足未被满足的临床需求为导向,在集团的优势治疗领域持续深耕,凭借强劲的自主研发与转化能力确立和巩固集团在核心细分赛道的研发优势。研究院将以患者需求为初心、科技创新为引擎,深耕生命健康领域,用优质创新药物赋能人类健康事业,助力集团打造全球竞争力。如需了解更多研发动态,欢迎关注“人福医药研究院”微信公众号。
Humanwell’s Innovative Oncology Drug HWS116 Injection Enrolls First Subject in Phase I Clinical Trial
Recently, the Phase I clinical trial of HWS116 injection, an FGFR2b monoclonal antibody independently developed by Humanwell, successfully enrolled its first patient, marking the product’s formal entry into the patient clinical trial stage.
The Phase I clinical study of HWS116 injection, titled A single-arm, open-label, dose-escalation and dose-expansion Phase I study of HWS116 injection in patients with advanced solid tumors, has completed enrollment of its first subject. The lead principal investigator(PI)of this study is Academician Ruihua Xu from Sun Yat-sen University Cancer Center. This study is designed to evaluate the safety, tolerability, pharmacokinetics, and preliminary antitumor activity of HWS116 as monotherapy in patients with advanced solid tumors.
About FGFR2b Monoclonal Antibodies
Fibroblast growth factors (FGFs) and their receptors (FGFRs) regulate a wide range of physiological cellular processes. The functional human FGFR family primarily comprises four core subtypes: FGFR1, FGFR2, FGFR3, and FGFR4. Aberrant activation of FGFR signaling can drive cancer progression and metastasis by promoting cell proliferation, prolonged survival, and angiogenesis. Several small-molecule tyrosine kinase inhibitors (TKIs) targeting FGFR have already been approved; however, the clinical benefit of these agents is limited to some extent by hyperphosphatemia caused by off-target FGFR1 inhibition and by the emergence of FGFR resistance mutations[1]. Fibroblast growth factor receptor 2b (FGFR2b, also known as FGFR2 IIIb) is an isoform of FGFR2 that is primarily expressed in epithelial cells[2]. During tumor initiation and progression, the FGFR2b signaling pathway is frequently aberrantly activated through mechanisms such as amplification, mutation, and overexpression, resulting in sustained activation of downstream pathways including RAS-RAF-MAPK and PI3K-AKT, which in turn drive tumor cell proliferation, survival, and angiogenesis[3]. Aberrant FGFR2b activation is commonly observed across a variety of malignancies, including gastric cancer, breast cancer, cholangiocarcinoma, lung cancer, and ovarian cancer[4]. Studies have shown that approximately 38% of patients with gastric cancer exhibit FGFR2b overexpression[5].
Compared with small-molecule drugs, FGFR2b monoclonal antibodies offer three key advantages:
Precision targeting: Specifically recognizes the unique epitope of FGFR2b, thereby minimizing off-target toxicity;
Overcoming resistance: Acts on the extracellular domain and is therefore not affected by kinase domain mutations;
Convenient dosing: Long half-life, stable systemic exposure, and low dosing frequency;
To date, no FGFR2b-targeted therapy has been approved anywhere in the world.
About HWS116 Injection
HWS116 is an innovative biologic independently developed by Humanwell Research & Development Institute and exerts antitumor activity through a dual mechanism:
Blocking the FGFR2b signaling pathway to inhibit tumor growth;
Killing tumor cells through Fc-mediated antibody-dependent cellular cytotoxicity (ADCC) and antibody-dependent cellular phagocytosis (ADCP);
Preclinical data show that HWS116 demonstrates stronger antitumor activity than reference agents across multiple tumor models with high FGFR2b expression, while also maintaining a favorable safety profile.
Milestone significance:
HWS116 is the third FGFR2b monoclonal antibody globally to enter clinical development. As the program advances, it has the potential to provide a new precision treatment option for patients with advanced tumors harboring FGFR2b abnormalities, helping address the current clinical challenges of limited treatment options and poor prognosis.
About Humanwell R&D Institute
Humanwell Pharmaceutical Research and Development Institute is the central R&D organization of Humanwell Healthcare and the core engine driving Humanwell's innovation-led development. It undertakes Humanwell's strategic transformation mission and provides essential support for building a global R&D system and advancing toward a world-class life sciences enterprise. Focused on innovative drug development and guided by unmet clinical needs, the Institute continues to deepen its expertise in Humanwell's key therapeutic areas, leveraging strong in-house R&D and translational capabilities to establish and reinforce Humanwell's research advantages in core niche segments. With patient needs as its founding mission and technological innovation as its driving force, the Institute is committed to advancing the field of life and health sciences, empowering human health through high-quality innovative medicines, and helping Humanwell build global competitiveness. For more updates on our R&D progress, follow the official WeChat account "Humanwell Pharmaceutical Research Institute".
参考文献:
[1] Katoh M, Loriot Y, Brandi G, Tavolari S, Wainberg ZA, Katoh M. FGFR-targeted therapeutics: clinical activity, mechanisms of resistance and new directions. Nat Rev Clin Oncol. 2024;21(4):312-329. doi:10.1038/s41571-024-00869-z
[2] Ishiwata T. Role of fibroblast growth factor receptor-2 splicing in normal and cancer cells. Front Biosci (Landmark Ed). 2018;23(4):626-639. Published 2018 Jan 1. doi:10.2741/4609
[3] Smyth EC, Kim KM, Rha SY, et al. FGFR2b protein overexpression: An emerging biomarker in gastric and gastroesophageal junction adenocarcinoma. Cancer Treat Rev. 2025;139:102971. doi:10.1016/j.ctrv.2025.102971
[4] Ishiwata T. Role of fibroblast growth factor receptor-2 splicing in normal and cancer cells. Front Biosci (Landmark Ed). 2018;23(4):626-639. Published 2018 Jan 1. doi:10.2741/4609
[5] Rha SY, Zhang Y, Elme A, et al. Prevalence of FGFR2b Protein Overexpression in Advanced Gastric Cancers During Prescreening for the Phase III FORTITUDE-101 Trial. JCO Precis Oncol. 2025;9:e2400710. doi:10.1200/PO-24-00710
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