An anti-tumor effect potentiator containing, as an active ingredient, a uracil compound represented by the following formula (I) or a pharmaceutically acceptable salt thereof:
wherein X represents a C1-5 alkylene group and one of methylene groups constituting the alkylene group is optionally replaced with an oxygen atom;
R1 represents a hydrogen atom or a C1-6 alkyl group; R2 represents a hydrogen atom or a halogen atom; and R3 represents a C1-6 alkyl group, a C2-6 alkenyl group, a C3-6 cycloalkyl group, a (C3-6 cycloalkyl) C1-6 alkyl group, a halogeno-C1-6 alkyl group or a saturated heterocyclic group.
一种抗肿瘤增效剂,其活性成分含有下式(I)代表的尿
嘧啶化合物或其药学上可接受的盐:
其中 X 代表 C1-5 亚烷基,构成亚烷基的亚甲基之一可选择被氧原子取代;
R1 代表氢原子或 C1-6 烷基;R2 代表氢原子或卤素原子;R3 代表 C1-6 烷基、C2-6 烯基、C3-6 环烷基、(C3-6 环烷基)C1-6 烷基、卤素-C1-6 烷基或饱和杂环基。