PROBLEM TO BE SOLVED: To provide a method for the treatment or prevention of non-cancerous, benign brain tumors.SOLUTION: The present invention provides a method comprising administering a pyrimidylaminobenzamide derivative represented by the formula (II), or an N-oxide or a salt thereof.SELECTED DRAWING: None【課題】非癌性、良性脳腫瘍の処置又は予防方法の提供。【解決手段】下式(II)に示されるピリミジルアミノベンズアミド誘導体、そのN-オキシド、又はその塩を投与することを含む方法。【選択図】なし