EGFR^L858R (IC50 = 12 nM); EGFR^L858R/T790M (IC50 = 1 nM)

体外活性：与野生型体外相比，AZD9291 对突变型 EGFR 细胞系的增殖具有明显更有效的抑制作用。激酶测定：Osimertinib（以前称为 AZD-9291 和 mereletinib）是一种口服的、不可逆的、突变选择性的第三代 EGFR 抑制剂，对于外显子 19 缺失 EGFR、L858R/T790M EGFR、IC50 分别为 12.92、11.44 和 493.8 nM。和 WT EGFR 分别在 LoVo 细胞中。它抑制激活性和耐药性 EGFR 突变，同时保留正常皮肤和肠道细胞中存在的正常形式 EGFR，从而减少当前可用药物遇到的副作用。细胞测定：AZD9291 在体外有效抑制 EGFRm+（例如 PC9；< 25 nM）和 EGFR m+/T790M（例如 H1975；< 25 nM）细胞系中的 EGFR 磷酸化，同时对野生型 EGFR 系（例如 LoVo）的活性要低得多；> 500 nM)。一致地，与野生型体外相比，AZD9291 在突变型 EGFR 细胞系中显示出更有效的增殖抑制作用。

AZD9291（5mg/kg po）可引起 EGFRm+ (PC9) 和 EGFRm+/T790M (H1975) 肿瘤模型的肿瘤深度消退，并在体内深度抑制 EGFR 磷酸化和关键下游信号通路（如 AKT 和 ERK）。

奥希替尼（Osimertinib），原名mereletinib和AZD-9291，是第三代EGFR抑制剂，可口服且不可逆。它选择性地靶向 EGFR 的特定突变体，在 LoVo 细胞中对野生型 EGFR、L858R/T790M EGFR 和外显子 19 缺失 EGFR 的 IC50 值分别为 493.8 nM。它通过抑制激活性和耐药性 EGFR 突变，同时保护正常皮肤和肠道细胞中的正常形式 EGFR，减少与当前可用药物相关的副作用。

PC-9 细胞接种到含有 RPMI 生长培养基的 T75 烧瓶（5×10⁵ 细胞/烧瓶）后，在 37°C、5% CO₂ 下培养。第二天将培养基更换为补充有 EGFR 抑制剂的培养基，其浓度相当于 PC-9 细胞中预定的 EC50。每两到三天更换一次培养基，使耐药克隆达到 80% 汇合，然后将细胞进行胰蛋白酶处理并重新接种到含有两倍 EGFR 抑制剂的等量培养基中。在达到 1.5 μM ZD1839、1.5 μM BIBW 2992、1.5 μM WZ4002 或 160 nM Osimertinib (AZD-9291) 的最终浓度之前，进行剂量递增[1]。

Mice: The mice used are male and female EGFR^L858R and EGFR^L858R+T790M mice. Oral gavage is used to administer osimertinib (AZD-9291) at a dose of 7.5 mg/kg and 5 mg/kg, respectively. The drug is suspended in 1% Polysorbate 80. Every week, the Vanderbilt University Institute of Imaging Science images mice. Prior to lung dissection and flash freezing, mice are given a drug treatment for eight hours in preparation for immunoblot analysis. Liquid nitrogen is used to grind the lungs before lysis.
Rats: The 10-week-old male RccHan:WIST rats are given a single oral dose of 200 mg/kg of osimertinib (AZD-9291). Accuchek Active meters are used to measure blood glucose levels.

[1]. AZD9291, an irreversible EGFR TKI, overcomes T790M-mediated resistance to EGFR inhibitors in lung cancer. Cancer Discov. 2014 Sep;4(9):1046-61.

[2]. Discovery of a potent and selective EGFR inhibitor (AZD9291) of both sensitizing and T790M resistancemutations that spares the wild type form of the receptor. J Med Chem. 2014 Oct 23;57(20):8249-67.

The first generation EGFR TKIs gefitinib and erlotinib provide significant clinical benefit in patients with advanced lung adenocarcinoma harbouring activating EGFR mutants (EGFRm+), but patients will ultimately develop disease progression due to acquired resistance. Acquisition of the EGFR T790M mutation is the most common mechanism of drug resistance, detected in more than 50% of gefitinib/erlotinib resistant patients. Current therapeutic strategies are limited for advanced lung adenocarcinoma patients with EGFR T790M (EGFRm+/T790M), so this remains a key area of unmet need. AZD9291 (structure to be disclosed at meeting) is an oral, irreversible, third generation, selective inhibitor of both EGFR activating (EGFRm+) and resistance (EGFRm+/T790M) mutations. The mechanistic and functional activity of AZD9291 was characterised in vitro and in vivo across a number of cell lines harbouring various EGFR-mutations or wild type EGFR. Presented data shows AZD9291 potently inhibits EGFR phosphorylation in EGFRm+ (e.g. PC9; <25nM) and EGFRm+/T790M (e.g. H1975; <25nM) cell lines in vitro, whilst demonstrating much less activity against wild-type EGFR lines (e.g. LoVo; >500nM). Consistently, AZD9291 showed significantly more potent inhibition of proliferation in mutant EGFR cell lines compared to wild-type in vitro. In addition, AZD9291 administered once daily orally at 5mg/kg caused profound regression of tumours across EGFRm+ (PC9; 178% growth inhibition) and EGFRm+/T790M (H1975; 119% growth inhibition) tumour models in vivo, after 14 days dosing. Furthermore 5mg/kg AZD9291 was sufficient to cause significant shrinkage of EGFRm+ and EGFRm+/T790M transgenic mouse lung tumours. Tumour growth inhibition was associated with profound inhibition of EGFR phosphorylation and key downstream signaling pathways such as AKT and ERK. Chronic long-term treatment of PC9 and H1975 xenograft tumours with AZD9291 led to a complete and sustained macroscopic response, with no visible tumours after 40 days dosing, and being maintained beyond 100 days. Furthermore, pre-clinical data also indicates that AZD9291 could target tumours that have acquired resistance to the more recently identified HER2-amplification mechanism, thus potentially extending its benefit in TKI resistant patients. Taken together, preclinical data demonstrates that AZD9291 is a potent and effective inhibitor of both EGFR activating (EGFRm+) and resistance (EGFRm+/T790M) mutations whilst sparing wild-type EGFR. These data support the further clinical investigation of AZD9291 in advanced EGFR mutant lung adenocarcinoma.

C30H41N7O8S2

691.818644285202

691.245

2070014-82-1

Osimertinib;1421373-65-0;Osimertinib mesylate;1421373-66-1

92044416

Light yellow to yellow solid

213Ų

4

13

10

47

845

0

RPUCCTLBBCSFEX-UHFFFAOYSA-N

InChI=1S/C28H33N7O2.2CH4O3S/c1-7-27(36)30-22-16-23(26(37-6)17-25(22)34(4)15-14-33(2)3)32-28-29-13-12-21(31-28)20-18-35(5)24-11-9-8-10-19(20)24;2*1-5(2,3)4/h7-13,16-18H,1,14-15H2,2-6H3,(H,30,36)

N-[2-[2-(dimethylamino)ethyl-methylamino]-4-methoxy-5-[[4-(1-methylindol-3-yl)pyrimidin-2-yl]amino]phenyl]prop-2-enamide;methanesulfonic acid

AZD-9291 dimesylate; AZD9291; AZD 9291; Mereletinib dimesylate; Trade name: Tagrisso

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

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Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)