A compound represented by formula (I) or a pharmacologically acceptable salt thereof, which can inhibit a fibroblast growth factor receptor (FGFR) family kinase in cancer tissues. (In the formula, A represents a 5- to 10-membered heteroaryl group, or a C6-10 aryl group； R1 and R2 independently represent H, OH, X, CN, NO2, a C1-4 haloalkyl group, a C1-6 alkyl group, or the like <；R1 and R2 together form a (substituted) 3- to 10-membered heterocyclyl group or a (substituted) 5- to 10-membered heteroaryl group>；； R3 represents H, a C1-5 alkyl group, a C6-10 aryl group, a C1-5 alkyl group, or a C1-4 haloalkyl group； and R4 represents H, X, a C1-3 alkyl group, a C1-4 haloalkyl group, OH, CN, NO2, or the like.).Se describen métodos para tratar cáncer al administrar un compuesto de la fórmula (I), (fórmula I) o una sal farmacéuticamente aceptable o solvato del mismo, en combinación con otros tratamientos de cáncer, en donde R1 es halo； R2 es halo； y Q es CH o N.
