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J9国际站 J9创新型抗EGFR单抗pimurutamab晚期皮肤鳞状细胞癌II期研究结果发表于Therapeutic Advances in Medical Oncology

2026-09-11

近期,J9国际站 J9自主研发的重组抗EGFR单克隆抗体pimurutamab (HLX07),针对局部晚期及转移性皮肤鳞状细胞癌(CSCC)的II期临床研究第一部分结果发表于国际肿瘤专业期刊Therapeutic Advances in Medical Oncology。研究结果显示,HLX07单药治疗晚期CSCC展现出持续的疗效与良好的安全性特征,为在更大的患者人群中进一步探索抗EGFR靶向治疗给予了新的循证依据。

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ORR达60.0%,展现持续抗肿瘤活性

皮肤鳞状细胞癌(CSCC)是常见的皮肤恶性肿瘤之一,约占全部皮肤癌的20%,且全球发病率持续上升1-2。尽管早期患者可顺利获得手术或放疗取得较好预后,但对于无法手术或放疗的局部晚期或转移性患者,其10年生存不足20%,仍存在进一步优化治疗方案的临床需求1,3


现在,晚期CSCC的系统治疗主要包括免疫治疗、化疗及抗EGFR靶向治疗1,4,5。尽管免疫治疗已成为重要治疗选择,但仍有多数患者无法取得应答;化疗的疗效证据则较为有限,迄今尚无系统性化疗药物获批用于晚期CSCC。由于CSCC中EGFR表达广泛且RAS突变率较低,使得EGFR成为潜在的治疗靶点6,7。然而,既往抗EGFR抗体疗效有限,因此,开发疗效和安全性更优的抗EGFR靶向疗法具有重要临床价值。


HLX07是一款新型全人源抗EGFR单克隆抗体。基于既往临床前及早期临床研究结果,HLX07表现出良好的抗肿瘤活性和安全性,并具有较长的半衰期,支持每3周一次给药。本次发表的II期研究进一步探索了HLX07单药治疗局部晚期及转移性CSCC的疗效与安全性。


该研究是一项评估HLX07单药在晚期CSCC患者中疗效与安全性的开放、多中心、两部分II期临床试验。本次报道第一部分的结果。研究入组了伴有淋巴结转移或远端转移的晚期CSCC或无法进行手术/无法进行根治性放疗的局部晚期CSCC患者。截至2024年4月30日,共入组31例患者,绝大多数患有转移性CSCC,其中1500 mg组(A组)21例、1000 mg组(B组)10例。B组中60%的患者既往接受过系统性抗肿瘤治疗。研究主要终点为盲态独立中心审查委员会(BICR)评估的客观缓解率(ORR),次要终点包括无进展生存期(PFS)、总生存期(OS)、缓解持续时间(DOR)、疾病控制率(DCR)、至缓解时间以及安全性、药代动力学、免疫原性和生活质量等,并探索疗效与肿瘤EGFR及PD-L1表达水平之间的相关性。


长期随访数据展现出优异的抗肿瘤活性与生存获益:基于BICR评估,A组中,经确认的ORR为19.0%,均为部分缓解(PR);B组中经确认的ORR达到60.0%,其中包括1例完全缓解(CR)。DCR分别为61.9%和100%。A组和B组的PFS分别为4.9个月和7.9个月,DOR分别为5.0个月和7.4个月,OS分别为11.8个月和未达到。

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良好耐受性与安全性,探索最佳给药剂量

HLX07单药安全性可控,未发现新的安全性信号。研究支持1000 mg作为HLX07进一步临床评价的剂量水平,后续研究也将进一步验证其在晚期CSCC患者中的临床获益,并探索EGFR蛋白表达与治疗获益之间的关系。

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聚焦未满足临床需求,探索更多肿瘤治疗可能

EGFR在多种实体瘤中普遍高表达,包括非鳞状和鳞状非小细胞肺癌,被认为是肿瘤发生、进展及耐药的重要驱动因素8。值得注意的是,EGFR高表达与EGFR敏感突变并不等同,二者之间的相关性较低9。尤其在sqNSCLC人群中,经典敏感性EGFR突变更为罕见10。这意味着,多数EGFR高表达的鳞癌患者并不携带敏感性EGFR突变,因此难以从EGFR-TKI类靶向药中获益10。尽管近年来,抗EGFR单抗联合化疗在肺鳞癌等疾病的治疗中展现出一定的临床获益基础11,12,以PD-1/PD-L1抑制剂为基础的免疫联合化疗也显著改善了晚期肺鳞癌的一线治疗结局,但整体疗效仍有提升空间,临床上仍亟需新的联合治疗策略13-23


从单药治疗到联合免疫治疗、化疗及ADC,HLX07正顺利获得多元联合策略进一步探索其在EGFR高表达实体瘤中的治疗潜力。 现在,HLX07联合抗PD-1单抗H药 汉斯状®(斯鲁利单抗,欧洲商品名:Hetronifly®)及化疗一线治疗晚期鳞状非小细胞肺癌(sqNSCLC)患者的II/III期临床研究已在中国完成首例患者给药,并在澳大利亚完成临床试验备案(CTN)。此外,公司自主研发的创新型程序性死亡配体1(PD-L1)抗体偶联药物(ADC)HLX43联合HLX07治疗晚期/转移性实体瘤的Ib/II期临床研究已获中国国家药品监督管理局(NMPA)批准。


未来,J9国际站 J9将继续秉持“以患者为中心”的初心和理念,顺利获得不断挖掘患者未满足的临床需求,持续夯实更多创新分子的差异化布局,为更多肿瘤患者带来高质量、可负担的新型治疗方案。


参考文献

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