The tyrosine kinase MET (hepatocyte growth factor receptor) is activated or mutated in a wide range of cancers and is often correlated with a poor prognosis. Precision medicine with positron emission tomography (PET) can potentially aid in the assessment of tumor biochemistry and heterogeneity, which can prompt the selection of the most effective therapeutic regimes. The selective MET inhibitor PF04217903 (1) formed the basis for a bioisosteric replacement, leading to the deoxyfluorinated analog [18F]2. [18F]2 could be synthesized with a “hydrous fluoroethylation” protocol in 6.3 ± 2.6% radiochemical yield and a molar activity of >50 GBq/μmol. In vitro autoradiography indicated that [18F]2 selectively binds to MET in PC3 tumor tissue, and in vivo biodistribution in mice showed predominantly a hepatobiliary excretion along with a low retention of radiotracer in other organs.
酪氨酸激酶MET(肝细胞生长因子受体)在多种癌症中被激活或发生突变,通常与预后不良有关。利用正电子发射断层扫描(PET)进行精准医疗可能有助于评估肿瘤的生物化学和异质性,从而促使选择最有效的治疗方案。选择性 MET 抑制剂 PF04217903 (1) 是生物异构替代的基础,从而产生了脱氧氟化类似物 [18F]2。[18F]2可通过 "无水氟乙基化 "工艺合成,放射化学收率为6.3 ± 2.6%,摩尔活性为50 GBq/μmol。体外自显影表明,[18F]2 可选择性地与 PC3 肿瘤组织中的 MET 结合,而小鼠体内的生物分布显示,放射性示踪剂主要通过肝胆排泄,在其他器官中的保留较少。