ABSK-131

2025年03月06日，和誉医药（港交所代码：02256）宣布，其自主研发的高选择性小分子PRMT5*MTA抑制剂ABSK131已获中国国家药品监督管理局药品审评中心（CDE）批准治疗晚期实体瘤患者的临床研究许可。去年12月，其临床试验已被美国FDA批准。 此次获批的研究是“一项评估ABSK131在晚期/转移性实体瘤患者中的安全性、耐受性、药代动力学和初步有效性的1期、首次人体、多中心、开放性研究”。研究人群主要为抑癌基因MTAP缺失的患者。 约15%的人类实体肿瘤缺乏抑癌基因MTAP的表达[1]。MTAP缺失发生率较高的实体瘤包括非小细胞肺癌（NSCLC）（15.7%）、胰腺癌（21.7%）、食管癌（28.4%）、间皮瘤（32.2%）、和胃肠道肿瘤（10.4%的胃癌和1%的结直肠癌）等[2]。 MTAP参与编码多胺和嘌呤代谢中的关键限速酶，在嘌呤和甲硫氨酸合成补救途径中起重要作用[3]。MTAP缺失会导致其底物甲硫代腺苷（MTA）积累，进而抑制蛋白精氨酸甲基转移酶5（PRMT5）的活性[4]。PRMT5作为一种酶，可催化两个甲基从S-腺苷蛋氨酸（SAM）对称转移到蛋白质上的精氨酸残基，影响着多种生理过程，包括转录、RNA剪接、核糖体生物合成和细胞周期调控[5-6]。PRMT5在MTAP缺失肿瘤中表现出“合成致死”效应[7-9]。近期研究显示，选择性靶向抑制PRMT5*MTA有望成为MTAP缺失肿瘤的新型治疗策略。 关于ABSK131 ABSK131是上海和誉生物医药科技有限公司正在开发的一款新型小分子PRMT5-MTA协同抑制剂，具有强效的抗肿瘤活性。在临床前研究中，它对MTAP缺失的肿瘤细胞显示出极好的选择性。临床前研究显示, ABSK131口服给药具有良好的药物代谢和药代动力学特性。 Abbisko Therapeutics Announces IND Clearance for ABSK131, a Novel PRMT5*MTA Inhibitor, from the China CDE 06 March 2025, Shanghai—Abbisko Therapeutics Co., Ltd. (“Abbisko” hereafter) today announced that the Center for Drug Evaluation (CDE) of the China National Medical Products Administration (NMPA) has cleared the IND application for ABSK131, a highly-selective small molecule inhibitor of PRMT5*MTA. Earlier in December 2024, ABSK131 received IND clearance from the U.S. FDA. A phase 1 clinical study in patients with advanced solid tumors will be conducted under the title “A Phase 1, First-in-Human, Multicenter, Open-Label Study of ABSK131 to Assess Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy in Patients with Advanced/Metastatic Solid Tumors”. The study population will primarily consist of patients with MTAP gene deficiency. Approximately 15% of solid tumors lack expression of methylthioadenosine phosphorylase (MTAP), a tumor suppressor gene [1]. Solid tumors with high rates of MTAP deficiency include non-small cell lung cancer (NSCLC) (15.7%), pancreatic cancer (21.7%), esophageal cancer (28.4%), mesothelioma (32.2%), and gastrointestinal cancer (10.4% of gastric and 1% of colorectal cancer)[2], of which mesotheliomas and pancreatic cancers have no approved targeted therapies. MTAP encodes a key rate-limiting enzyme in the metabolism of polyamines and purines and plays a major role in the purine/methionine salvage pathway[3]. MTAP deficiency causes accumulation of its substrate methylthioadenosine (MTA) that inhibits protein arginine methyltransferase 5 (PRMT5) [4]. PRMT5 is an enzyme that catalyzes the symmetrical transfer of two methyl groups from S-adenosyl methionine (SAM) to arginine residues on proteins, influencing various physiological processes, including transcription, RNA splicing, ribosome biogenesis, and cell cycle regulation [5-6]. PRMT5 has been found to exhibit synthetic lethality in MTAP-deficient tumors [7-9]. Recent studies have demonstrated that selectively targeting PRMT5*MTA shows promise as a therapeutic strategy for MTAP-deficient cancers. About ABSK131 ABSK131 is a novel, small molecule MTA-cooperative PRMT5 inhibitor in development by Abbisko Therapeutics. In preclinical studies, ABSK131 demonstrated excellent selectivity for MTAP-deleted cancer cells, as well as favorable drug metabolism and pharmacokinetic properties for oral dosing. 参考文献/References: 1. Kalev P, Hyer ML, Gross S, et al. MAT2A Inhibition Blocks the Growth of MTAP-Deleted Cancer Cells by Reducing PRMT5-Dependent mRNA Splicing and Inducing DNA Damage. Cancer Cell. 2021;39(2):209-224.e11. doi:10.1016/j.ccell.2020.12.010 2. Bertino JR, Waud WR, Parker WB, Lubin M. Targeting tumors that lack  methylthioadenosine phosphorylase (MTAP) activity: current strategies. Cancer Biol Ther. 2011;11(7):627-632. doi:10.4161/cbt.11.7.14948. 3. de Menezes WP, Silva VAO, Gomes INF, Rosa MN, Spina MLC, Carloni AC, et al. Loss of 5′-methylthioadenosine phosphorylase (MTAP) is frequent in high-grade gliomas; nevertheless, it is not associated with higher tumor aggressiveness. Cells. 2020;9(2):492. 4. Bray C, Balcells C, McNeish IA, Keun HC. The potential and challenges of targeting MTAP-negative cancers beyond synthetic lethality. Front Oncol. 2023;13:1264785. Published 2023 Sep 19. doi:10.3389/fonc.2023.1264785. 5. Blanc RS, Richard S. Arginine Methylation: The Coming of Age. Mol Cell. 2017;65(1):8-24. 6. Kim H, Ronai ZA. PRMT5 function and targeting in cancer. Cell Stress. 2020;4(8):199-215. 7. Kryukov GV, Wilson FH, Ruth JR, Paulk J, Tsherniak A, Marlow SE, et al. MTAP deletion confers enhanced dependency on the PRMT5 arginine methyltransferase in cancer cells. Science. 2016;351(6278):1214-8. 8. Marjon K, Cameron MJ, Quang P, Clasquin MF, Mandley E, Kunii K, et al. MTAP Deletions in Cancer Create Vulnerability to Targeting of the MAT2A/PRMT5/RIOK1 Axis. Cell Rep. 2016;15(3):574-87. 9. Mavrakis KJ, McDonald ER, 3rd, Schlabach MR, Billy E, Hoffman GR, deWeck A, et al. Disordered methionine metabolism in MTAP/CDKN2A-deleted cancers leads to dependence on PRMT5. Science. 2016;351(6278):1208-13. 关于和誉 和誉医药（香港联交所代码：02256）成立于2016年，是一家立足中国，着眼全球的创新药研发公司。公司的创始人和管理团队拥有多年顶尖跨国药企的研发和管理经验，并参与了多个临床及上市新药的研发。和誉医药专注于肿瘤新药研发，以小分子肿瘤精准治疗和小分子肿瘤免疫治疗药物为核心，着眼病患及医药市场的需求，秉承国际新药开发的理念和标准，致力于开发新颖及高潜力药物靶点的潜在first-in-class或best-in-class创新药物，用于改善中国及全球病人的生活质量。自成立以来，和誉医药已经建立了丰富的创新产品管线，涵盖肿瘤精准治疗领域以及肿瘤免疫治疗领域。 更多信息，欢迎访问 www.abbisko.com。