PROBLEM TO BE SOLVED: To provide a method of treating CD19+ B cell malignancies symptoms.SOLUTION: A method comprises administering, to a patient in need of treatment for CD19+ B cell malignancies, therapeutically effective amounts of anti-CD19 maytansinoid immunoconjugate SAR3419 represented by the formula in the figure.SELECTED DRAWING: None【課題】ＣＤ１９＋Ｂ細胞悪性腫瘍の症状の治療方法。【解決手段】治療有効量の下記式で表される抗ＣＤ１９メイタンシノイドイムノコンジュゲート、ＳＡＲ３４１９を、ＣＤ１９＋Ｂ細胞性腫瘍に対して、治療を必要とする患者への投与する方法。【選択図】なし
