2025年7月14日，复宏汉霖(2696.HK)宣布，公司创新型抗HER2单抗HLX22头对头对比一线标准疗法(曲妥珠单抗+化疗±帕博利珠单抗)的国际多中心III期研究(HLX22-GC-301)完成美国首例患者给药，拟用于联合曲妥珠单抗及化疗一线治疗HER2阳性晚期胃癌。目前，全球尚无同类用于治疗HER2阳性胃癌的HER2双靶向疗法获批准上市。

HLX22-GC-301由北京大学肿瘤医院沈琳教授与NCCN胃癌与食管癌专委会主席，MD安德森癌症中心的Jaffer A. Ajan教授牵头开展，此前已于中国、日本、澳大利亚、韩国完成首例受试者给药，并已在智利、巴西、阿根廷等国家和地区获得临床试验开展许可。此外，HLX22已于2025年获得美国食品药品监督管理局(FDA)和欧盟委员会(EC)授予的孤儿药资格认定(Orphan Drug Designation, ODD)，用于胃癌的治疗。

据GLOBOCAN数据显示，2022年全球约有100万胃癌新发病例，逾66万死亡病例，疾病负担呈现显著地域不平衡[1]，构成了一大健康问题。多数胃癌患者早期症状隐匿，确诊时已处于疾病晚期，总体预后不良，5年生存率仅为6%[2,3]。尽管近年来靶向治疗(如抗HER2药物)和免疫检查点抑制剂(如抗PD-1/PD-L1单抗)在胃癌的治疗中取得了一定进展[4]，但鉴于该疾病具有高度分子异质性，不同亚型患者对化疗、靶向治疗和免疫治疗的反应差异显著[5]。免疫治疗局限于PD-L1阳性人群，且疗效改善有限。胃癌尤其是HER2阳性胃癌的整体治疗仍存在巨大的未满足的临床需求。

HLX22为靶向HER2的创新型单克隆抗体，可结合在HER2的胞外亚结构域IV，但结合表位与曲妥珠单抗有所不同，使得该产品能够与曲妥珠单抗同时结合至HER2，有效促进HER2二聚体(HER2同源二聚体及HER2/EGFR异源二聚体)的内吞和降解，将HER2的内吞效率提高了40%-80%，进而产生更强的HER2受体阻断效果。HLX22联合汉曲优®(曲妥珠单抗，美国商品名：HERCESSI™️，欧洲商品名：Zercepac®)治疗HER2阳性胃癌II期临床研究(HLX22-GC-201)更新结果于2025年美国临床肿瘤学会(ASCO)发布[6]，数据显示经过长期随访(中位随访周期超2年)，HLX22在HER2阳性胃癌治疗中依然展现出稳定的疗效获益，远超历史数据。

HLX22-GC-301临床研究是一项双盲、国际多中心随机对照III期研究，旨在比较HLX22联合曲妥珠单抗和化疗对比曲妥珠单抗和化疗联合或不联合帕博利珠单抗，一线治疗HER2阳性局部晚期或转移性胃癌/胃食管结合部癌患者的疗效和安全性。符合条件的受试者将以1:1的比例随机分配至试验组(接受HLX22(15 mg/kg)联合曲妥珠单抗和化疗)或对照组(接受安慰剂联合曲妥珠单抗和化疗，联合或不联合帕博利珠单抗)。该研究的主要终点为独立影像评估委员会(IRRC)基于RECIST v1.1评估的无进展生存期(PFS)和总生存期(OS)。次要终点包括研究者评估的PFS、IRRC或研究者评估的客观缓解率(ORR)、下一线治疗的PFS2、缓解持续时间(DOR)、生活质量、安全性、免疫原性和药代动力学特征。

除胃癌外，复宏汉霖近期亦启动一项HLX22联合德曲妥珠单抗治疗HER2低表达HR阳性乳腺癌的II期临床研究(HLX22-BC201)并于中国境内完成首例患者给药。未来，复宏汉霖也将持续探索新型抗HER2靶向疗法在肿瘤中的治疗潜力，高效推进HLX22的全球临床开发进展，为全球患者提供更多可负担、疗效更好的治疗方案。

参考文献

[1] Bray F, Laversanne M, Sung H, et al. CA Cancer J Clin. 2024: 1-35.

[2] Ajani JA. et al. J Natl Compr Canc Netw 2022;20(2):167-92.

[3] Alsina M. et al. Nat Rev Gastroenterol Hepatol 2023;20(3):155-70.

[4] Miao, ZF.,et al. Progress and remaining challenges in comprehensive gastric cancer treatment. Holist Integ Oncol 1, 4 (2022).

[5] Guan, WL.,et al. Gastric cancer treatment: recent progress and future perspectives. J Hematol Oncol 16, 57 (2023).

[6] Jin Li et al. HLX22 plus trastuzumab and XELOX for first-line treatment of HER2-positive locally advanced or metastatic gastric/gastroesophageal junction cancer (G/GEJC): Updated results with additional patients.. JCO 43, 440-440(2025). DOI:10.1200/JCO.2025.43.4_suppl.440

关于复宏汉霖

复宏汉霖(2696.HK)是一家国际化的创新生物制药公司，致力于为全球患者提供可负担的高品质生物药，产品覆盖肿瘤、自身免疫疾病、眼科疾病等领域，已有6款产品在中国获批上市，4款产品在国际获批上市，5个上市申请分别获中国药监局、美国FDA和欧盟EMA受理。自2010年成立以来，复宏汉霖已建成一体化生物制药平台，高效及创新的自主核心能力贯穿研发、生产及商业运营全产业链。公司已建立完善高效的全球创新中心，按照国际药品生产质量管理规范(GMP)标准进行生产和质量管控，不断夯实一体化综合生产平台，其中，公司商业化生产基地已相继获得中国、欧盟和美国GMP认证。

复宏汉霖前瞻性布局了一个多元化、高质量的产品管线，涵盖约50个分子，并全面推进基于自有抗PD-1单抗H药汉斯状®的肿瘤免疫联合疗法。截至目前，公司已获批上市产品包括国内首个生物类似药汉利康®(利妥昔单抗)、自主研发的中美欧三地获批单抗生物类似药汉曲优®(曲妥珠单抗，美国商品名：HERCESSI™，欧洲商品名：Zercepac®)、汉达远®(阿达木单抗)、汉贝泰®(贝伐珠单抗)、全球首个获批一线治疗小细胞肺癌的抗PD-1单抗汉斯状®(斯鲁利单抗，欧洲商品名：Hetronifly®)以及汉奈佳®(奈拉替尼)。公司亦同步就19个产品在全球范围内开展30多项临床试验，对外授权全面覆盖欧美主流生物药市场和众多新兴市场。

Henlius’ HLX22 International Multicentre Phase 3 Head-to-Head Trial Administers First Dose to US Patient in HER2+ GC

Shanghai, China, July 14, 2025 — Shanghai Henlius Biotech, Inc. (2696.HK) today announced that the first patient in the United States has been dosed in the company’s international multicentre phase 3 head-to-head clinical trial (HLX22-GC-301) comparing its novel anti-HER2 monoclonal antibody (mAb) HLX22 in combination with trastuzumab and chemotherapy with the current first-line standard of care therapy (trastuzumab + chemotherapy ± pembrolizumab) as the first-line treatment for HER2-positive advanced gastric cancer. As of now, no similar dual HER2 blockade therapy for the treatment of HER2-positive gastric cancer has received approval for commercialization globally.

The study is co-led by Prof. Lin Shen from Peking University Cancer Hospital and Professor Jaffer A. Ajani (MD Anderson Cancer Center; Chair of the NCCN Guidelines Panel for Gastric and Esophageal Cancers), and has previously dosed first patients in China, Japan, Australia, and South Korea, with investigational new drug (IND) approvals obtained in Chile, Brazil, Argentina and other countries and regions. HLX22 has been granted Orphan Drug Designation (ODD) by both the US Food and Drug Administration (FDA) and the European Commission (EC) for the treatment of gastric cancer.

Until now, gastric cancer still constitutes a major global health problem. According to GLOBOCAN 2022, there were around 1 million new cases and over 660 thousand new deaths of gastric cancer in 2022 globally [1]. Gastric cancer is often diagnosed at an advanced stage, with a poor prognosis and a 5-year relative survival rate of only 6% [2,3]. Despite the advancements in targeted therapies, such as anti-HER2 agents, and immune checkpoint inhibitors (anti-PD-1/PD-L1 mAbs) for gastric cancer treatment in recent years [4], the disease's high molecular heterogeneity leads to markedly varied responses to chemotherapy, targeted therapy, and immunotherapy across different subtypes [5]. Immunotherapy remains limited to PD-L1 positive populations with only modest efficacy improvements. This underscores the urgent unmet clinical needs in the overall management of HER2 positive gastric cancer.

HLX22, an innovative anti-HER2 mAb, can bind to HER2 extracellular subdomain IV at a binding site different from that of trastuzumab via differentiated molecular design and mechanism of action, which allows simultaneous binding of HLX22 and trastuzumab to HER2 dimers (HER2 homodimer and HER2/EGFR heterodimer) on tumour cell surface, resulting in a 40%–80% increase in HER2 internalisation. Updated results from a phase 2 study (HLX22-GC-201) of HLX22 in combination with HANQUYOU (trastuzumab, trade name: HERCESSI™ in the U.S., Zercepac® in Europe) and chemotherapy as a first-line treatment for HER2-positive advanced gastric cancer were presented at ASCO 2025 [6]. The data demonstrated that the efficacy benefit of HLX22 in HER2-positive gastric cancer remained stable with extended follow-up (median follow-up exceeding two years), outperforming previous data.

This double-blind, randomized, controlled multicenter phase 3 study aims to compare the efficacy and safety of HLX22 in combination with Trastuzumab and chemotherapy versus trastuzumab and chemotherapy with or without pembrolizumab as first-line treatment in patients with HER2-positive, locally advanced or metastatic gastroesophageal junction cancer and gastric cancer. Eligible participants will be randomized at 1:1 to the experimental arm (treated with HLX22 (15 mg/kg) in combination with Trastuzumab and chemotherapy) or the control group (placebo plus Trastuzumab and chemotherapy with or without pembrolizumab). The primary endpoints of this study are progression-free survival (PFS) assessed by independent radiology review committee (IRRC) per RECIST v1.1 and overall survival (OS), the secondary endpoints include investigator-assessed PFS, IRRC or investigator-assessed objective response rate (ORR), PFS2, duration of response (DOR), quality of life, safety, immunogenicity and pharmacokinetic characteristics.

Beyond gastric cancer, Henlius has also recently initiated a phase 2 clinical trial (HLX22-BC201) of HLX22 in combination with trastuzumab deruxtecan (T-DXd) as second-line therapy for HER2-low, hormone receptor (HR)-positive locally advanced or metastatic breast cancer and has dosed the first patient in China. Moving forward, Henlius will continue to explore the therapeutic potential of novel HER2-targeted therapies in tumours, accelerating HLX22’s global development to deliver more affordable and effective treatment options for patients worldwide.

About Henlius

Henlius (2696.HK) is a global biopharmaceutical company with the vision to offer high-quality, affordable and innovative biologic medicines for patients worldwide with a focus on oncology, autoimmune diseases and ophthalmic diseases. Up to date, 6 products have been launched in China, 4 have been approved for marketing in overseas markets, and 5 marketing applications have been accepted for review in China, the U.S. and the EU, respectively. Since its inception in 2010, Henlius has built an integrated biopharmaceutical platform with core capabilities of high-efficiency and innovation embedded throughout the whole product life cycle including R&D, manufacturing and commercialization. It has established global innovation centre and Shanghai-based commercial manufacturing facilities certificated by China, the EU and U.S. GMP.

Henlius has pro-actively built a diversified and high-quality product pipeline covering about 50 molecules and has continued to explore immuno-oncology combination therapies with proprietary HANSIZHUANG (anti-PD-1 mAb) as the backbone. To date, the company's launched products include HANLIKANG (rituximab), the first China-developed biosimilar, HANQUYOU (trastuzumab, trade name: HERCESSI™ in the U.S., Zercepac® in Europe), a China-developed mAb biosimilar approved in China, Europe and U.S., HANDAYUAN (adalimumab), HANBEITAI (bevacizumab), HANSIZHUANG (serplulimab, trade name: Hetronifly® in Europe), the world’s first anti-PD-1 mAb for the first-line treatment of SCLC, and HANNAIJIA (neratinib). What’s more, Henlius has conducted over 30 clinical studies for 19 products, expanding its presence in major markets as well as emerging markets.