Being the composition for chemical plug medical therapy of the solid tumor, the composition which includes antorasaikurin which is absorbed in the particle, and the said polymer which consist of, the water expansible anion characteristic synthetic polymer of insoluble in the water. As for the aforementioned polymer, poly- (vinyl alcohol) with the type polymer, as for the medicine it is desirable to be dokisorubishin.固形腫瘍の化学的塞栓療法用組成物であって、水に不溶の、水膨張性陰イオン性合成ポリマーから成る粒子、および、該ポリマーに吸収されるアントラサイクリンを含む組成物。前記ポリマーは、ポリ(ビニルアルコール)系ポリマーで、薬剤はドキソルビシンであることが望ましい。