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亞盛醫藥-B(06855.HK):APG-2575治療復發難治CLL/SLL的初步療效和安全性潛力突出 APG-115聯合帕博利珠單抗治療對免疫藥物耐藥的黑色素瘤患者現完全緩解
格隆匯 06-08 06:58

格隆匯6月8日丨亞盛醫藥-B(06855.HK)公佈,公司已在第57屆美國臨牀腫瘤學會(ASCO)年會上,以口頭報吿形式公佈了Bcl-2抑制劑Lisaftoclax (APG2575)在復發╱難治性R/R慢性淋巴細胞白血病╱小淋巴細胞淋巴瘤(CLL/SLL)和其他血液惡性腫瘤患者的首次人體試驗最新數據。同時公司也以口頭報吿形式公佈了MDM2-p53抑制劑Alrizomadlin (APG-115)聯合帕博利珠單抗應用於經免疫腫瘤(I-O)藥物治療失敗的不可切除╱轉移性黑色素瘤或晚期實體瘤患者的II期臨牀研究最新數據。

亞盛醫藥已連續第四年亮相ASCO年會。今年,亞盛醫藥共有包括兩項口頭報吿在內的四項臨牀研究入選ASCO年會展示。其中APG-2575的最新臨牀數據初步表現出良好的有效性和安全性。其治療R/R CLL/SLL患者的客觀緩解率(ORR)達80.0%,且耐受良好,不良事件可控,在最高劑量1,200mg仍未觀察到劑量限制毒性(DLT),仍未達到最大耐受量(MTD),無臨牀或實驗室腫瘤溶解綜合徵(TLS)報吿。

APG-115口頭報吿的最新臨牀數據顯示了良好的抗腫瘤活性和安全性,在其聯合帕博利珠單抗治療PD-1/PD-L1抑制劑耐藥的黑色素瘤隊列中,有一例患者獲得完全緩解(CR),該隊列的ORR達24.1%,疾病控制率(DCR)達55.2%。同時,該研究還在多例患有其他腫瘤的受試患者中觀察到部分緩解(PRs)。

初步PK結果顯示,APG-2575的暴露量從20mg到1,200mg逐漸增加(平均半衰期:4–5小時)。在BH3表達譜上,APG-2575迅速觸發CLL/SLL患者樣本中BCL-2複合物的變化,這與臨牀上淋巴細胞絕對計數(ALC)的快速降低表現一致。?結論:有效性和安全性數據表明,Bcl-2抑制劑APG-2575為R/R CLL/SLL患者和其他HMs患者提供了一種卓有潛力的替代治療方案,其每日劑量遞增方案對患者更友好。

此外,在被觀察到的任何級別治療相關不良事件(TRAEs)中,發生率大於10%的TRAEs有噁心、血小板減少、嘔吐、疲乏、食慾下降、腹瀉、中性粒細胞減少和貧血。結論:APG-115聯合帕博利珠單抗的耐受性良好,且無疊加毒性。這一初步研究結果為APG-115聯合帕博利珠單抗治療經腫瘤免疫療法後復發╱難治性轉移性黑色素瘤(包括葡萄膜、粘膜和皮膚黑色素瘤)提供了臨牀依據。同時,該聯合治療在帕博利珠單抗無獲批適應症的MPNST和脂肪肉瘤患者中也具有良好的抗腫瘤活性。

據悉,APG-2575是亞盛醫藥自主研發的的新型口服Bcl-2選擇性小分子抑制劑,通過選擇性抑制Bcl-2蛋白來恢復腫瘤細胞程序性死亡機制(細胞凋亡),從而殺死腫瘤,擬用於治療多種血液惡性腫瘤和實體瘤。APG-2575是首個在中國進入臨牀階段的、本土研發的Bcl-2選擇性抑制劑。目前該藥物已獲得美國、中國、澳大利亞多項Ib/II期臨牀試驗許可,正在全球同步推進多個血液腫瘤適應症的臨牀開發。

APG-115是亞盛醫藥自主的一種口服、高選擇性的小分子MDM2抑制劑,對MDM2具有高度結合親和力,通過阻斷MDM2-p53相互作用從而恢復p53腫瘤抑制活性。APG-115是首個在中國進入臨牀階段的MDM2-p53抑制劑,已在中國、美國和澳大利亞展開多項治療實體瘤及血液腫瘤的臨牀研究。

APG-1252是亞盛醫藥自主研發的Bcl-2/Bcl-xL雙靶點抑制劑,可通過選擇性抑制Bcl-2及Bcl-xL蛋白恢復細胞凋亡。目前在中國、美國、澳大利亞開展多項單藥或聯合治療小細胞肺癌、非小細胞肺癌等晚期腫瘤的Ib/II期臨牀試驗。

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