摘要:Vir Biotechnology旗下两款T细胞接合器(TCE)VIR-5818与VIR-5500的初步1期临床数据积极,在曾接受过多线治疗的癌症患者中观察到早期临床缓解的信号。其中,VIR-5500在治疗前列腺癌患者的临床试验中让100%患者的前列腺特异性
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本期看点
1. Vir Biotechnology旗下两款T细胞接合器(TCE)VIR-5818与VIR-5500的初步1期临床数据积极,在曾接受过多线治疗的癌症患者中观察到早期临床缓解的信号。其中,VIR-5500在治疗前列腺癌患者的临床试验中让100%患者的前列腺特异性抗原(PSA)指标产生下降。
2. 用于治疗动脉粥样硬化的CD47靶向疗法BRB-002在1期临床试验测试的最高剂量下,受体占有率(RO)可达100%。
3. AMPA受体负变构调节剂RAP-219在一项1期临床试验中,给药后的5天内就达到了临床前模型中与最大疗效相关的靶点RO(50%-70%),同时保持了与先前1期临床试验一致的差异化的耐受性特征。
药明康德内容团队整理
VIR-5818、VIR-5500:公布1期临床试验数据
Vir Biotechnology公司公布了旗下两款T细胞接合器VIR-5818与VIR-5500的初步 。VIR-5818、VIR-5500是分别靶向HER2、前列腺特异性膜抗原(PSMA)的TCE,均采用PRO-XTEN平台所开发。TCE是一类强效抗肿瘤药物,能够引导免疫系统(特别是T细胞)杀死癌细胞。PRO-XTEN平台的掩蔽技术旨在使TCE保持不活跃(掩蔽)状态,直到其到达肿瘤微环境,在特定的肿瘤蛋白酶作用下去除掩蔽并激活,从而杀伤癌细胞。
VIR-5818在一项1期临床试验中接受评估,旨在检视其作为单药的安全性和药代动力学,以及与帕博利珠单抗联合使用的效果。受试者包含多种HER2表达癌症的患者,包括乳腺癌和结直肠癌(CRC)。初步疗效数据显示,接受≥400 µg/kg VIR-5818的患者中,50%(10/20)出现剂量依赖性肿瘤缩小。其中一些患者此前已接受多达9种治疗方案。在HER2阳性CRC患者亚组中,观察到强效抗肿瘤活性,这些患者已用尽标准治疗手段。在该亚组中,33%(2/6)的患者在早期剂量下达到确认的部分缓解(cPR),其中一名患者在数据截止时持续cPR超过18个月。初步安全性数据显示,VIR-5818整体耐受性良好,79名患者中仅出现轻度1级或2级细胞因子释放综合征(CRS),占比分别为20%和10%,未观察到3级或更高等级的CRS。
▲VIR-5818展现初步抗肿瘤效果(图片来源:参考资料[2])
VIR-5500正在一项1期临床试验中接受评估,该研究旨在检视其在转移性去势抵抗性前列腺癌(mCRPC)患者中的安全性、药代动力学和初步疗效。该研究已招募了18名具有显著疾病负担并接受过3至6线治疗的患者。初步疗效数据显示,接受≥120 µg/kg初步剂量的患者中,100%(12/12)观察到前列腺特异性抗原水平降低,58%(7/12)患者达到PSA50应答(即PSA水平降低50%)。安全性数据显示,在剂量高达1000 µg/kg且未使用预防性皮质类固醇的情况下,未观察到剂量限制性毒性。此外,仅观察到轻度1级或2级CRS(分别为17%和11%),未出现3级或更高等级的CRS。
▲VIR-5500使患者产生强劲的PSA50应答(图片来源:参考资料[2])
BRB-002:公布1期临床试验的初步数据
Bitterroot Bio公司公布了BRB-002在健康受试者中开展的1期研究的积极结果。BRB-002是一种潜在“first-in-class”的免疫调节蛋白疗法,用于治疗动脉粥样硬化性心血管疾病。该疗法通过抑制细胞表面受体CD47("别吃我"信号),从而改善动脉粥样硬化的根本原因,减轻炎症斑块的负担。
此次公布的结果显示,BRB-002在所有测试剂量下都是安全的,没有报告严重的不良事件。此外,观察到CD47受体占有率的增加与剂量有关,在测试的最高剂量下,RO可达100%。在动脉粥样硬化的临床前模型中,CD47的RO为6-26%时,主动脉斑块的负担相对于对照组明显减少。
RAP-219:公布1期临床试验数据
Rapport Therapeutics公司公布了RAP-219的正电子发射断层扫描(PET)试验和第二次多剂量递增试验(MAD-2)的结果。RAP-219是一种临床阶段的AMPA受体负变构调节剂,旨在通过选择性靶向AMPA相关蛋白TARPγ8实现神经解剖学特异性。AMPA受体存在于整个大脑,包括小脑和脑干,它们的非选择性靶向导致耐受性差。相比之下,TARPγ8在海马和大脑皮层中表达丰富,在小脑和脑干中表达最少。RAP-219被设计为对TARPγ8具有高效力和选择性。据观察,它具有较长的半衰期(8-14天)和很小的药物相互作用,使其非常适合多药治疗。与传统的神经科学药物相比,RAP-219有可能提供更好的活性、耐受性和更高的治疗指数,从而为更多的患者提供持续的治疗益处,而不会产生无法忍受的副作用。该公司目前正在寻求RAP-219作为局灶性癫痫、糖尿病周围神经性疼痛和双相躁狂患者的潜在差异化治疗。
此次公布的PET试验数据表明,RAP-219在给药后5天内就达到了先前临床前模型中与最大疗效相关的靶点RO(50%-70%),同时保持了与先前1期临床试验一致的差异化的耐受性特征。在MAD-2试验中,观察到RAP-219通常耐受性良好,与最初的MAD试验相比,剂量滴定速度更快,暴露量更高。
Sabirnetug(ACU193):公布1期临床试验数据
Acumen Pharmaceuticals公司在Journal of Prevention of Alzheimer's Disease杂志上发表了1期临床试验INTERCEPT-AD的结果,该研究旨在评估sabirnetug(ACU193)在早期阿尔茨海默病(AD)患者中的安全性和耐受性。Sabirnetug是一种选择性靶向毒性可溶性β淀粉样蛋白寡聚体(AβOs)的人源化单克隆抗体。Sabirnetug能够结合AβOs,由于其独特的结合特性,sabirnetug有可能在产生淀粉样蛋白相关成像异常(ARIA,一种抗淀粉样蛋白抗体疗法产生的常见主要副作用)风险较低的情况下提供治疗益处,因为sabirnetug可以在不直接靶向淀粉样斑块的情况下阻断AβOs的毒性作用。
此次公布的结果显示,sabirnetug的耐受性总体良好,其靶点作用和淀粉样斑块的减少具有剂量和暴露依赖性,支持sabirnetug在早期AD治疗方面的持续开发。此前公布的结果表明,sabirnetug对AβOs具有选择性、剂量依赖性的靶点作用,在较高剂量组中,淀粉样斑块的减少具有统计学意义,且ARIA-E(水肿)的总体水平较低。
QTX3544:IND申请获得FDA许可
Quanta Therapeutics公司宣布,美国FDA批准了其多KRAS抑制剂QTX3544的IND申请,可以针对携带KRAS G12V突变的实体瘤患者启动1期临床试验。QTX3544是一种口服的、偏好G12V突变、同时作用于KRAS活性(ON)和非活性(OFF)状态的KRAS抑制剂。该公司同时宣布,其用于评估另一种KRAS抑制剂QTX3046与西妥昔单抗的联用效果的1期临床试验已启动组合治疗部分。QTX3046是一种口服的选择性KRAS G12D别构抑制剂,它可以同时作用于KRAS的ON和OFF状态。
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参考资料(可上下滑动查看)
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