The present application provides compositions and methods for preparing and using "heavy" nucleotide derivatives of thymidine or uridine by replacing the oxygen atom attached to one or more of positions with non-radioactive oxygen-18 (18O), administering it to a subject to target a tumor including incorporation into tumor cell DNA, and then treating the tumor with proton beam therapy to transmutate the 18O to 18F, resulting in a break of the new fluorine-phosphorous bond. This chemical event destabilizes ribose-phosphate DNA back-bone and base pairing thus produce single- and double strand breaks, clusters lesions that can lead to irreparable DNA damage and enhanced tumor cell killing. The atomic, chemical, and physical aspects result in the use of lower radiation doses and significantly alter acute and late morbidity of radiotherapy. Heavy thymidine and heavy uridine derivatives labeled with 18O have been made and tested.
本申请提供了制备和使用“重型”胸腺
嘧啶或尿
嘧啶核苷酸衍
生物的组合物和方法,通过用非放射性氧-18(18O)替换连接在一个或多个位置上的氧原子,将其注入到患者体内以靶向肿瘤,包括将其并入到肿瘤细胞DNA中,然后使用质子束治疗来转变18O为18F,从而破坏新的
氟-
磷键。这种
化学事件不稳定了
核糖-
磷酸DNA骨架和碱基配对,从而产生单链和双链断裂、簇状损伤,可能导致不可修复的DNA损伤和增强的肿瘤细胞杀伤。原子、
化学和物理方面的特性导致使用较低的辐射剂量,并显著改变了放射治疗的急性和迟发性发病率。已经制备和测试了标记有18O的重型胸腺
嘧啶和重型尿
嘧啶衍
生物。