亚盛医药-B(06855.HK):APG-2575治疗复发难治CLL/SLL的初步疗效和安全性潜力突出 APG-115联合帕博利珠单抗治疗对免疫药物耐药的黑色素瘤患者现完全缓解
格隆汇6月8日丨亚盛医药-B(06855.HK)公布,公司已在第57届美国临床肿瘤学会(ASCO)年会上,以口头报告形式公布了Bcl-2抑制剂Lisaftoclax (APG2575)在复发╱难治性R/R慢性淋巴细胞白血病╱小淋巴细胞淋巴瘤(CLL/SLL)和其他血液恶性肿瘤患者的首次人体试验最新数据。同时公司也以口头报告形式公布了MDM2-p53抑制剂Alrizomadlin (APG-115)联合帕博利珠单抗应用于经免疫肿瘤(I-O)药物治疗失败的不可切除╱转移性黑色素瘤或晚期实体瘤患者的II期临床研究最新数据。
亚盛医药已连续第四年亮相ASCO年会。今年,亚盛医药共有包括两项口头报告在内的四项临床研究入选ASCO年会展示。其中APG-2575的最新临床数据初步表现出良好的有效性和安全性。其治疗R/R CLL/SLL患者的客观缓解率(ORR)达80.0%,且耐受良好,不良事件可控,在最高剂量1,200mg仍未观察到剂量限制毒性(DLT),仍未达到最大耐受量(MTD),无临床或实验室肿瘤溶解综合征(TLS)报告。
APG-115口头报告的最新临床数据显示了良好的抗肿瘤活性和安全性,在其联合帕博利珠单抗治疗PD-1/PD-L1抑制剂耐药的黑色素瘤队列中,有一例患者获得完全缓解(CR),该队列的ORR达24.1%,疾病控制率(DCR)达55.2%。同时,该研究还在多例患有其他肿瘤的受试患者中观察到部分缓解(PRs)。
初步PK结果显示,APG-2575的暴露量从20mg到1,200mg逐渐增加(平均半衰期:4–5小时)。在BH3表达谱上,APG-2575迅速触发CLL/SLL患者样本中BCL-2复合物的变化,这与临床上淋巴细胞绝对计数(ALC)的快速降低表现一致。?结论:有效性和安全性数据表明,Bcl-2抑制剂APG-2575为R/R CLL/SLL患者和其他HMs患者提供了一种卓有潜力的替代治疗方案,其每日剂量递增方案对患者更友好。
此外,在被观察到的任何级别治疗相关不良事件(TRAEs)中,发生率大于10%的TRAEs有恶心、血小板减少、呕吐、疲乏、食欲下降、腹泻、中性粒细胞减少和贫血。结论:APG-115联合帕博利珠单抗的耐受性良好,且无叠加毒性。这一初步研究结果为APG-115联合帕博利珠单抗治疗经肿瘤免疫疗法后复发╱难治性转移性黑色素瘤(包括葡萄膜、粘膜和皮肤黑色素瘤)提供了临床依据。同时,该联合治疗在帕博利珠单抗无获批适应症的MPNST和脂肪肉瘤患者中也具有良好的抗肿瘤活性。
据悉,APG-2575是亚盛医药自主研发的的新型口服Bcl-2选择性小分子抑制剂,通过选择性抑制Bcl-2蛋白来恢复肿瘤细胞程序性死亡机制(细胞凋亡),从而杀死肿瘤,拟用于治疗多种血液恶性肿瘤和实体瘤。APG-2575是首个在中国进入临床阶段的、本土研发的Bcl-2选择性抑制剂。目前该药物已获得美国、中国、澳大利亚多项Ib/II期临床试验许可,正在全球同步推进多个血液肿瘤适应症的临床开发。
APG-115是亚盛医药自主的一种口服、高选择性的小分子MDM2抑制剂,对MDM2具有高度结合亲和力,通过阻断MDM2-p53相互作用从而恢复p53肿瘤抑制活性。APG-115是首个在中国进入临床阶段的MDM2-p53抑制剂,已在中国、美国和澳大利亚展开多项治疗实体瘤及血液肿瘤的临床研究。
APG-1252是亚盛医药自主研发的Bcl-2/Bcl-xL双靶点抑制剂,可通过选择性抑制Bcl-2及Bcl-xL蛋白恢复细胞凋亡。目前在中国、美国、澳大利亚开展多项单药或联合治疗小细胞肺癌、非小细胞肺癌等晚期肿瘤的Ib/II期临床试验。
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